are recognized by the keyword they
  // start with. Many are trivial to parse, some require a bit of
  // complexity.

  switch (starttype) {
    case types._break:case types._continue:
      return this.parseBreakContinueStatement(node, starttype.keyword);
    case types._debugger:
      return this.parseDebuggerStatement(node);
    case types._do:
      return this.parseDoStatement(node);
    case types._for:
      return this.parseForStatement(node);
    case types._function:
      if (!declaration) this.unexpected();
      return this.parseFunctionStatement(node);

    case types._class:
      if (!declaration) this.unexpected();
      return this.parseClass(node, true);

    case types._if:
      return this.parseIfStatement(node);
    case types._return:
      return this.parseReturnStatement(node);
    case types._switch:
      return this.parseSwitchStatement(node);
    case types._throw:
      return this.parseThrowStatement(node);
    case types._try:
      return this.parseTryStatement(node);

    case types._let:
    case types._const:
      if (!declaration) this.unexpected(); // NOTE: falls through to _var

    case types._var:
      return this.parseVarStatement(node, starttype);

    case types._while:
      return this.parseWhileStatement(node);
    case types._with:
      return this.parseWithStatement(node);
    case types.braceL:
      return this.parseBlock();
    case types.semi:
      return this.parseEmptyStatement(node);
    case types._export:
    case types._import:
      if (this.hasPlugin("dynamicImport") && this.lookahead().type === types.parenL) break;

      if (!this.options.allowImportExportEverywhere) {
        if (!topLevel) {
          this.raise(this.state.start, "'import' and 'export' may only appear at the top level");
        }

        if (!this.inModule) {
          this.raise(this.state.start, "'import' and 'export' may appear only with 'sourceType: \"module\"'");
        }
      }
      return starttype === types._import ? this.parseImport(node) : this.parseExport(node);

    case types.name:
      if (this.state.value === "async") {
        // peek ahead and see if next token is a function
        var state = this.state.clone();
        this.next();
        if (this.match(types._function) && !this.canInsertSemicolon()) {
          this.expect(types._function);
          return this.parseFunction(node, true, false, true);
        } else {
          this.state = state;
        }
      }
  }

  // If the statement does not start with a statement keyword or a
  // brace, it's an ExpressionStatement or LabeledStatement. We
  // simply start parsing an expression, and afterwards, if the
  // next token is a colon and the expression was a simple
  // Identifier node, we switch to interpreting it as a label.
  var maybeName = this.state.value;
  var expr = this.parseExpression();

  if (starttype === types.name && expr.type === "Identifier" && this.eat(types.colon)) {
    return this.parseLabeledStatement(node, maybeName, expr);
  } else {
    return this.parseExpressionStatement(node, expr);
  }
};

pp$1.takeDecorators = function (node) {
  if (this.state.decorators.length) {
    node.decorators = this.state.decorators;
    this.state.decorators = [];
  }
};

pp$1.parseDecorators = function (allowExport) {
  while (this.match(types.at)) {
    var decorator = this.parseDecorator();
    this.state.decorators.push(decorator);
  }

  if (allowExport && this.match(types._export)) {
    return;
  }

  if (!this.match(types._class)) {
    this.raise(this.state.start, "Leading decorators must be attached to a class declaration");
  }
};

pp$1.parseDecorator = function () {
  if (!this.hasPlugin("decorators")) {
    this.unexpected();
  }
  var node = this.startNode();
  this.next();
  node.expression = this.parseMaybeAssign();
  return this.finishNode(node, "Decorator");
};

pp$1.parseBreakContinueStatement = function (node, keyword) {
  var isBreak = keyword === "break";
  this.next();

  if (this.isLineTerminator()) {
    node.label = null;
  } else if (!this.match(types.name)) {
    this.unexpected();
  } else {
    node.label = this.parseIdentifier();
    this.semicolon();
  }

  // Verify that there is an actual destination to break or
  // continue to.
  var i = void 0;
  for (i = 0; i < this.state.labels.length; ++i) {
    var lab = this.state.labels[i];
    if (node.label == null || lab.name === node.label.name) {
      if (lab.kind != null && (isBreak || lab.kind === "loop")) break;
      if (node.label && isBreak) break;
    }
  }
  if (i === this.state.labels.length) this.raise(node.start, "Unsyntactic " + keyword);
  return this.finishNode(node, isBreak ? "BreakStatement" : "ContinueStatement");
};

pp$1.parseDebuggerStatement = function (node) {
  this.next();
  this.semicolon();
  return this.finishNode(node, "DebuggerStatement");
};

pp$1.parseDoStatement = function (node) {
  this.next();
  this.state.labels.push(loopLabel);
  node.body = this.parseStatement(false);
  this.state.labels.pop();
  this.expect(types._while);
  node.test = this.parseParenExpression();
  this.eat(types.semi);
  return this.finishNode(node, "DoWhileStatement");
};

// Disambiguating between a `for` and a `for`/`in` or `for`/`of`
// loop is non-trivial. Basically, we have to parse the init `var`
// statement or expression, disallowing the `in` operator (see
// the second parameter to `parseExpression`), and then check
// whether the next token is `in` or `of`. When there is no init
// part (semicolon immediately after the opening parenthesis), it
// is a regular `for` loop.

pp$1.parseForStatement = function (node) {
  this.next();
  this.state.labels.push(loopLabel);

  var forAwait = false;
  if (this.hasPlugin("asyncGenerators") && this.state.inAsync && this.isContextual("await")) {
    forAwait = true;
    this.next();
  }
  this.expect(types.parenL);

  if (this.match(types.semi)) {
    if (forAwait) {
      this.unexpected();
    }
    return this.parseFor(node, null);
  }

  if (this.match(types._var) || this.match(types._let) || this.match(types._const)) {
    var _init = this.startNode();
    var varKind = this.state.type;
    this.next();
    this.parseVar(_init, true, varKind);
    this.finishNode(_init, "VariableDeclaration");

    if (this.match(types._in) || this.isContextual("of")) {
      if (_init.declarations.length === 1 && !_init.declarations[0].init) {
        return this.parseForIn(node, _init, forAwait);
      }
    }
    if (forAwait) {
      this.unexpected();
    }
    return this.parseFor(node, _init);
  }

  var refShorthandDefaultPos = { start: 0 };
  var init = this.parseExpression(true, refShorthandDefaultPos);
  if (this.match(types._in) || this.isContextual("of")) {
    var description = this.isContextual("of") ? "for-of statement" : "for-in statement";
    this.toAssignable(init, undefined, description);
    this.checkLVal(init, undefined, undefined, description);
    return this.parseForIn(node, init, forAwait);
  } else if (refShorthandDefaultPos.start) {
    this.unexpected(refShorthandDefaultPos.start);
  }
  if (forAwait) {
    this.unexpected();
  }
  return this.parseFor(node, init);
};

pp$1.parseFunctionStatement = function (node) {
  this.next();
  return this.parseFunction(node, true);
};

pp$1.parseIfStatement = function (node) {
  this.next();
  node.test = this.parseParenExpression();
  node.consequent = this.parseStatement(false);
  node.alternate = this.eat(types._else) ? this.parseStatement(false) : null;
  return this.finishNode(node, "IfStatement");
};

pp$1.parseReturnStatement = function (node) {
  if (!this.state.inFunction && !this.options.allowReturnOutsideFunction) {
    this.raise(this.state.start, "'return' outside of function");
  }

  this.next();

  // In `return` (and `break`/`continue`), the keywords with
  // optional arguments, we eagerly look for a semicolon or the
  // possibility to insert one.

  if (this.isLineTerminator()) {
    node.argument = null;
  } else {
    node.argument = this.parseExpression();
    this.semicolon();
  }

  return this.finishNode(node, "ReturnStatement");
};

pp$1.parseSwitchStatement = function (node) {
  this.next();
  node.discriminant = this.parseParenExpression();
  node.cases = [];
  this.expect(types.braceL);
  this.state.labels.push(switchLabel);

  // Statements under must be grouped (by label) in SwitchCase
  // nodes. `cur` is used to keep the node that we are currently
  // adding statements to.

  var cur = void 0;
  for (var sawDefault; !this.match(types.braceR);) {
    if (this.match(types._case) || this.match(types._default)) {
      var isCase = this.match(types._case);
      if (cur) this.finishNode(cur, "SwitchCase");
      node.cases.push(cur = this.startNode());
      cur.consequent = [];
      this.next();
      if (isCase) {
        cur.test = this.parseExpression();
      } else {
        if (sawDefault) this.raise(this.state.lastTokStart, "Multiple default clauses");
        sawDefault = true;
        cur.test = null;
      }
      this.expect(types.colon);
    } else {
      if (cur) {
        cur.consequent.push(this.parseStatement(true));
      } else {
        this.unexpected();
      }
    }
  }
  if (cur) this.finishNode(cur, "SwitchCase");
  this.next(); // Closing brace
  this.state.labels.pop();
  return this.finishNode(node, "SwitchStatement");
};

pp$1.parseThrowStatement = function (node) {
  this.next();
  if (lineBreak.test(this.input.slice(this.state.lastTokEnd, this.state.start))) this.raise(this.state.lastTokEnd, "Illegal newline after throw");
  node.argument = this.parseExpression();
  this.semicolon();
  return this.finishNode(node, "ThrowStatement");
};

// Reused empty array added for node fields that are always empty.

var empty = [];

pp$1.parseTryStatement = function (node) {
  this.next();

  node.block = this.parseBlock();
  node.handler = null;

  if (this.match(types._catch)) {
    var clause = this.startNode();
    this.next();

    this.expect(types.parenL);
    clause.param = this.parseBindingAtom();
    this.checkLVal(clause.param, true, Object.create(null), "catch clause");
    this.expect(types.parenR);

    clause.body = this.parseBlock();
    node.handler = this.finishNode(clause, "CatchClause");
  }

  node.guardedHandlers = empty;
  node.finalizer = this.eat(types._finally) ? this.parseBlock() : null;

  if (!node.handler && !node.finalizer) {
    this.raise(node.start, "Missing catch or finally clause");
  }

  return this.finishNode(node, "TryStatement");
};

pp$1.parseVarStatement = function (node, kind) {
  this.next();
  this.parseVar(node, false, kind);
  this.semicolon();
  return this.finishNode(node, "VariableDeclaration");
};

pp$1.parseWhileStatement = function (node) {
  this.next();
  node.test = this.parseParenExpression();
  this.state.labels.push(loopLabel);
  node.body = this.parseStatement(false);
  this.state.labels.pop();
  return this.finishNode(node, "WhileStatement");
};

pp$1.parseWithStatement = function (node) {
  if (this.state.strict) this.raise(this.state.start, "'with' in strict mode");
  this.next();
  node.object = this.parseParenExpression();
  node.body = this.parseStatement(false);
  return this.finishNode(node, "WithStatement");
};

pp$1.parseEmptyStatement = function (node) {
  this.next();
  return this.finishNode(node, "EmptyStatement");
};

pp$1.parseLabeledStatement = function (node, maybeName, expr) {
  for (var _iterator = this.state.labels, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
    var _ref;

    if (_isArray) {
      if (_i >= _iterator.length) break;
      _ref = _iterator[_i++];
    } else {
      _i = _iterator.next();
      if (_i.done) break;
      _ref = _i.value;
    }

    var _label = _ref;

    if (_label.name === maybeName) {
      this.raise(expr.start, "Label '" + maybeName + "' is already declared");
    }
  }

  var kind = this.state.type.isLoop ? "loop" : this.match(types._switch) ? "switch" : null;
  for (var i = this.state.labels.length - 1; i >= 0; i--) {
    var label = this.state.labels[i];
    if (label.statementStart === node.start) {
      label.statementStart = this.state.start;
      label.kind = kind;
    } else {
      break;
    }
  }

  this.state.labels.push({ name: maybeName, kind: kind, statementStart: this.state.start });
  node.body = this.parseStatement(true);
  this.state.labels.pop();
  node.label = expr;
  return this.finishNode(node, "LabeledStatement");
};

pp$1.parseExpressionStatement = function (node, expr) {
  node.expression = expr;
  this.semicolon();
  return this.finishNode(node, "ExpressionStatement");
};

// Parse a semicolon-enclosed block of statements, handling `"use
// strict"` declarations when `allowStrict` is true (used for
// function bodies).

pp$1.parseBlock = function (allowDirectives) {
  var node = this.startNode();
  this.expect(types.braceL);
  this.parseBlockBody(node, allowDirectives, false, types.braceR);
  return this.finishNode(node, "BlockStatement");
};

pp$1.isValidDirective = function (stmt) {
  return stmt.type === "ExpressionStatement" && stmt.expression.type === "StringLiteral" && !stmt.expression.extra.parenthesized;
};

pp$1.parseBlockBody = function (node, allowDirectives, topLevel, end) {
  node.body = [];
  node.directives = [];

  var parsedNonDirective = false;
  var oldStrict = void 0;
  var octalPosition = void 0;

  while (!this.eat(end)) {
    if (!parsedNonDirective && this.state.containsOctal && !octalPosition) {
      octalPosition = this.state.octalPosition;
    }

    var stmt = this.parseStatement(true, topLevel);

    if (allowDirectives && !parsedNonDirective && this.isValidDirective(stmt)) {
      var directive = this.stmtToDirective(stmt);
      node.directives.push(directive);

      if (oldStrict === undefined && directive.value.value === "use strict") {
        oldStrict = this.state.strict;
        this.setStrict(true);

        if (octalPosition) {
          this.raise(octalPosition, "Octal literal in strict mode");
        }
      }

      continue;
    }

    parsedNonDirective = true;
    node.body.push(stmt);
  }

  if (oldStrict === false) {
    this.setStrict(false);
  }
};

// Parse a regular `for` loop. The disambiguation code in
// `parseStatement` will already have parsed the init statement or
// expression.

pp$1.parseFor = function (node, init) {
  node.init = init;
  this.expect(types.semi);
  node.test = this.match(types.semi) ? null : this.parseExpression();
  this.expect(types.semi);
  node.update = this.match(types.parenR) ? null : this.parseExpression();
  this.expect(types.parenR);
  node.body = this.parseStatement(false);
  this.state.labels.pop();
  return this.finishNode(node, "ForStatement");
};

// Parse a `for`/`in` and `for`/`of` loop, which are almost
// same from parser's perspective.

pp$1.parseForIn = function (node, init, forAwait) {
  var type = void 0;
  if (forAwait) {
    this.eatContextual("of");
    type = "ForAwaitStatement";
  } else {
    type = this.match(types._in) ? "ForInStatement" : "ForOfStatement";
    this.next();
  }
  node.left = init;
  node.right = this.parseExpression();
  this.expect(types.parenR);
  node.body = this.parseStatement(false);
  this.state.labels.pop();
  return this.finishNode(node, type);
};

// Parse a list of variable declarations.

pp$1.parseVar = function (node, isFor, kind) {
  node.declarations = [];
  node.kind = kind.keyword;
  for (;;) {
    var decl = this.startNode();
    this.parseVarHead(decl);
    if (this.eat(types.eq)) {
      decl.init = this.parseMaybeAssign(isFor);
    } else if (kind === types._const && !(this.match(types._in) || this.isContextual("of"))) {
      this.unexpected();
    } else if (decl.id.type !== "Identifier" && !(isFor && (this.match(types._in) || this.isContextual("of")))) {
      this.raise(this.state.lastTokEnd, "Complex binding patterns require an initialization value");
    } else {
      decl.init = null;
    }
    node.declarations.push(this.finishNode(decl, "VariableDeclarator"));
    if (!this.eat(types.comma)) break;
  }
  return node;
};

pp$1.parseVarHead = function (decl) {
  decl.id = this.parseBindingAtom();
  this.checkLVal(decl.id, true, undefined, "variable declaration");
};

// Parse a function declaration or literal (depending on the
// `isStatement` parameter).

pp$1.parseFunction = function (node, isStatement, allowExpressionBody, isAsync, optionalId) {
  var oldInMethod = this.state.inMethod;
  this.state.inMethod = false;

  this.initFunction(node, isAsync);

  if (this.match(types.star)) {
    if (node.async && !this.hasPlugin("asyncGenerators")) {
      this.unexpected();
    } else {
      node.generator = true;
      this.next();
    }
  }

  if (isStatement && !optionalId && !this.match(types.name) && !this.match(types._yield)) {
    this.unexpected();
  }

  if (this.match(types.name) || this.match(types._yield)) {
    node.id = this.parseBindingIdentifier();
  }

  this.parseFunctionParams(node);
  this.parseFunctionBody(node, allowExpressionBody);

  this.state.inMethod = oldInMethod;

  return this.finishNode(node, isStatement ? "FunctionDeclaration" : "FunctionExpression");
};

pp$1.parseFunctionParams = function (node) {
  this.expect(types.parenL);
  node.params = this.parseBindingList(types.parenR);
};

// Parse a class declaration or literal (depending on the
// `isStatement` parameter).

pp$1.parseClass = function (node, isStatement, optionalId) {
  this.next();
  this.takeDecorators(node);
  this.parseClassId(node, isStatement, optionalId);
  this.parseClassSuper(node);
  this.parseClassBody(node);
  return this.finishNode(node, isStatement ? "ClassDeclaration" : "ClassExpression");
};

pp$1.isClassProperty = function () {
  return this.match(types.eq) || this.match(types.semi) || this.match(types.braceR);
};

pp$1.isClassMethod = function () {
  return this.match(types.parenL);
};

pp$1.isNonstaticConstructor = function (method) {
  return !method.computed && !method.static && (method.key.name === "constructor" || // Identifier
  method.key.value === "constructor" // Literal
  );
};

pp$1.parseClassBody = function (node) {
  // class bodies are implicitly strict
  var oldStrict = this.state.strict;
  this.state.strict = true;

  var hadConstructorCall = false;
  var hadConstructor = false;
  var decorators = [];
  var classBody = this.startNode();

  classBody.body = [];

  this.expect(types.braceL);

  while (!this.eat(types.braceR)) {
    if (this.eat(types.semi)) {
      if (decorators.length > 0) {
        this.raise(this.state.lastTokEnd, "Decorators must not be followed by a semicolon");
      }
      continue;
    }

    if (this.match(types.at)) {
      decorators.push(this.parseDecorator());
      continue;
    }

    var method = this.startNode();

    // steal the decorators if there are any
    if (decorators.length) {
      method.decorators = decorators;
      decorators = [];
    }

    method.static = false;
    if (this.match(types.name) && this.state.value === "static") {
      var key = this.parseIdentifier(true); // eats 'static'
      if (this.isClassMethod()) {
        // a method named 'static'
        method.kind = "method";
        method.computed = false;
        method.key = key;
        this.parseClassMethod(classBody, method, false, false);
        continue;
      } else if (this.isClassProperty()) {
        // a property named 'static'
        method.computed = false;
        method.key = key;
        classBody.body.push(this.parseClassProperty(method));
        continue;
      }
      // otherwise something static
      method.static = true;
    }

    if (this.eat(types.star)) {
      // a generator
      method.kind = "method";
      this.parsePropertyName(method);
      if (this.isNonstaticConstructor(method)) {
        this.raise(method.key.start, "Constructor can't be a generator");
      }
      if (!method.computed && method.static && (method.key.name === "prototype" || method.key.value === "prototype")) {
        this.raise(method.key.start, "Classes may not have static property named prototype");
      }
      this.parseClassMethod(classBody, method, true, false);
    } else {
      var isSimple = this.match(types.name);
      var _key = this.parsePropertyName(method);
      if (!method.computed && method.static && (method.key.name === "prototype" || method.key.value === "prototype")) {
        this.raise(method.key.start, "Classes may not have static property named prototype");
      }
      if (this.isClassMethod()) {
        // a normal method
        if (this.isNonstaticConstructor(method)) {
          if (hadConstructor) {
            this.raise(_key.start, "Duplicate constructor in the same class");
          } else if (method.decorators) {
            this.raise(method.start, "You can't attach decorators to a class constructor");
          }
          hadConstructor = true;
          method.kind = "constructor";
        } else {
          method.kind = "method";
        }
        this.parseClassMethod(classBody, method, false, false);
      } else if (this.isClassProperty()) {
        // a normal property
        if (this.isNonstaticConstructor(method)) {
          this.raise(method.key.start, "Classes may not have a non-static field named 'constructor'");
        }
        classBody.body.push(this.parseClassProperty(method));
      } else if (isSimple && _key.name === "async" && !this.isLineTerminator()) {
        // an async method
        var isGenerator = this.hasPlugin("asyncGenerators") && this.eat(types.star);
        method.kind = "method";
        this.parsePropertyName(method);
        if (this.isNonstaticConstructor(method)) {
          this.raise(method.key.start, "Constructor can't be an async function");
        }
        this.parseClassMethod(classBody, method, isGenerator, true);
      } else if (isSimple && (_key.name === "get" || _key.name === "set") && !(this.isLineTerminator() && this.match(types.star))) {
        // `get\n*` is an uninitialized property named 'get' followed by a generator.
        // a getter or setter
        method.kind = _key.name;
        this.parsePropertyName(method);
        if (this.isNonstaticConstructor(method)) {
          this.raise(method.key.start, "Constructor can't have get/set modifier");
        }
        this.parseClassMethod(classBody, method, false, false);
        this.checkGetterSetterParamCount(method);
      } else if (this.hasPlugin("classConstructorCall") && isSimple && _key.name === "call" && this.match(types.name) && this.state.value === "constructor") {
        // a (deprecated) call constructor
        if (hadConstructorCall) {
          this.raise(method.start, "Duplicate constructor call in the same class");
        } else if (method.decorators) {
          this.raise(method.start, "You can't attach decorators to a class constructor");
        }
        hadConstructorCall = true;
        method.kind = "constructorCall";
        this.parsePropertyName(method); // consume "constructor" and make it the method's name
        this.parseClassMethod(classBody, method, false, false);
      } else if (this.isLineTerminator()) {
        // an uninitialized class property (due to ASI, since we don't otherwise recognize the next token)
        if (this.isNonstaticConstructor(method)) {
          this.raise(method.key.start, "Classes may not have a non-static field named 'constructor'");
        }
        classBody.body.push(this.parseClassProperty(method));
      } else {
        this.unexpected();
      }
    }
  }

  if (decorators.length) {
    this.raise(this.state.start, "You have trailing decorators with no method");
  }

  node.body = this.finishNode(classBody, "ClassBody");

  this.state.strict = oldStrict;
};

pp$1.parseClassProperty = function (node) {
  this.state.inClassProperty = true;
  if (this.match(types.eq)) {
    if (!this.hasPlugin("classProperties")) this.unexpected();
    this.next();
    node.value = this.parseMaybeAssign();
  } else {
    node.value = null;
  }
  this.semicolon();
  this.state.inClassProperty = false;
  return this.finishNode(node, "ClassProperty");
};

pp$1.parseClassMethod = function (classBody, method, isGenerator, isAsync) {
  this.parseMethod(method, isGenerator, isAsync);
  classBody.body.push(this.finishNode(method, "ClassMethod"));
};

pp$1.parseClassId = function (node, isStatement, optionalId) {
  if (this.match(types.name)) {
    node.id = this.parseIdentifier();
  } else {
    if (optionalId || !isStatement) {
      node.id = null;
    } else {
      this.unexpected();
    }
  }
};

pp$1.parseClassSuper = function (node) {
  node.superClass = this.eat(types._extends) ? this.parseExprSubscripts() : null;
};

// Parses module export declaration.

pp$1.parseExport = function (node) {
  this.next();
  // export * from '...'
  if (this.match(types.star)) {
    var specifier = this.startNode();
    this.next();
    if (this.hasPlugin("exportExtensions") && this.eatContextual("as")) {
      specifier.exported = this.parseIdentifier();
      node.specifiers = [this.finishNode(specifier, "ExportNamespaceSpecifier")];
      this.parseExportSpecifiersMaybe(node);
      this.parseExportFrom(node, true);
    } else {
      this.parseExportFrom(node, true);
      return this.finishNode(node, "ExportAllDeclaration");
    }
  } else if (this.hasPlugin("exportExtensions") && this.isExportDefaultSpecifier()) {
    var _specifier = this.startNode();
    _specifier.exported = this.parseIdentifier(true);
    node.specifiers = [this.finishNode(_specifier, "ExportDefaultSpecifier")];
    if (this.match(types.comma) && this.lookahead().type === types.star) {
      this.expect(types.comma);
      var _specifier2 = this.startNode();
      this.expect(types.star);
      this.expectContextual("as");
      _specifier2.exported = this.parseIdentifier();
      node.specifiers.push(this.finishNode(_specifier2, "ExportNamespaceSpecifier"));
    } else {
      this.parseExportSpecifiersMaybe(node);
    }
    this.parseExportFrom(node, true);
  } else if (this.eat(types._default)) {
    // export default ...
    var expr = this.startNode();
    var needsSemi = false;
    if (this.eat(types._function)) {
      expr = this.parseFunction(expr, true, false, false, true);
    } else if (this.match(types._class)) {
      expr = this.parseClass(expr, true, true);
    } else {
      needsSemi = true;
      expr = this.parseMaybeAssign();
    }
    node.declaration = expr;
    if (needsSemi) this.semicolon();
    this.checkExport(node, true, true);
    return this.finishNode(node, "ExportDefaultDeclaration");
  } else if (this.shouldParseExportDeclaration()) {
    node.specifiers = [];
    node.source = null;
    node.declaration = this.parseExportDeclaration(node);
  } else {
    // export { x, y as z } [from '...']
    node.declaration = null;
    node.specifiers = this.parseExportSpecifiers();
    this.parseExportFrom(node);
  }
  this.checkExport(node, true);
  return this.finishNode(node, "ExportNamedDeclaration");
};

pp$1.parseExportDeclaration = function () {
  return this.parseStatement(true);
};

pp$1.isExportDefaultSpecifier = function () {
  if (this.match(types.name)) {
    return this.state.value !== "async";
  }

  if (!this.match(types._default)) {
    return false;
  }

  var lookahead = this.lookahead();
  return lookahead.type === types.comma || lookahead.type === types.name && lookahead.value === "from";
};

pp$1.parseExportSpecifiersMaybe = function (node) {
  if (this.eat(types.comma)) {
    node.specifiers = node.specifiers.concat(this.parseExportSpecifiers());
  }
};

pp$1.parseExportFrom = function (node, expect) {
  if (this.eatContextual("from")) {
    node.source = this.match(types.string) ? this.parseExprAtom() : this.unexpected();
    this.checkExport(node);
  } else {
    if (expect) {
      this.unexpected();
    } else {
      node.source = null;
    }
  }

  this.semicolon();
};

pp$1.shouldParseExportDeclaration = function () {
  return this.state.type.keyword === "var" || this.state.type.keyword === "const" || this.state.type.keyword === "let" || this.state.type.keyword === "function" || this.state.type.keyword === "class" || this.isContextual("async");
};

pp$1.checkExport = function (node, checkNames, isDefault) {
  if (checkNames) {
    // Check for duplicate exports
    if (isDefault) {
      // Default exports
      this.checkDuplicateExports(node, "default");
    } else if (node.specifiers && node.specifiers.length) {
      // Named exports
      for (var _iterator2 = node.specifiers, _isArray2 = Array.isArray(_iterator2), _i2 = 0, _iterator2 = _isArray2 ? _iterator2 : _iterator2[Symbol.iterator]();;) {
        var _ref2;

        if (_isArray2) {
          if (_i2 >= _iterator2.length) break;
          _ref2 = _iterator2[_i2++];
        } else {
          _i2 = _iterator2.next();
          if (_i2.done) break;
          _ref2 = _i2.value;
        }

        var specifier = _ref2;

        this.checkDuplicateExports(specifier, specifier.exported.name);
      }
    } else if (node.declaration) {
      // Exported declarations
      if (node.declaration.type === "FunctionDeclaration" || node.declaration.type === "ClassDeclaration") {
        this.checkDuplicateExports(node, node.declaration.id.name);
      } else if (node.declaration.type === "VariableDeclaration") {
        for (var _iterator3 = node.declaration.declarations, _isArray3 = Array.isArray(_iterator3), _i3 = 0, _iterator3 = _isArray3 ? _iterator3 : _iterator3[Symbol.iterator]();;) {
          var _ref3;

          if (_isArray3) {
            if (_i3 >= _iterator3.length) break;
            _ref3 = _iterator3[_i3++];
          } else {
            _i3 = _iterator3.next();
            if (_i3.done) break;
            _ref3 = _i3.value;
          }

          var declaration = _ref3;

          this.checkDeclaration(declaration.id);
        }
      }
    }
  }

  if (this.state.decorators.length) {
    var isClass = node.declaration && (node.declaration.type === "ClassDeclaration" || node.declaration.type === "ClassExpression");
    if (!node.declaration || !isClass) {
      this.raise(node.start, "You can only use decorators on an export when exporting a class");
    }
    this.takeDecorators(node.declaration);
  }
};

pp$1.checkDeclaration = function (node) {
  if (node.type === "ObjectPattern") {
    for (var _iterator4 = node.properties, _isArray4 = Array.isArray(_iterator4), _i4 = 0, _iterator4 = _isArray4 ? _iterator4 : _iterator4[Symbol.iterator]();;) {
      var _ref4;

      if (_isArray4) {
        if (_i4 >= _iterator4.length) break;
        _ref4 = _iterator4[_i4++];
      } else {
        _i4 = _iterator4.next();
        if (_i4.done) break;
        _ref4 = _i4.value;
      }

      var prop = _ref4;

      this.checkDeclaration(prop);
    }
  } else if (node.type === "ArrayPattern") {
    for (var _iterator5 = node.elements, _isArray5 = Array.isArray(_iterator5), _i5 = 0, _iterator5 = _isArray5 ? _iterator5 : _iterator5[Symbol.iterator]();;) {
      var _ref5;

      if (_isArray5) {
        if (_i5 >= _iterator5.length) break;
        _ref5 = _iterator5[_i5++];
      } else {
        _i5 = _iterator5.next();
        if (_i5.done) break;
        _ref5 = _i5.value;
      }

      var elem = _ref5;

      if (elem) {
        this.checkDeclaration(elem);
      }
    }
  } else if (node.type === "ObjectProperty") {
    this.checkDeclaration(node.value);
  } else if (node.type === "RestElement" || node.type === "RestProperty") {
    this.checkDeclaration(node.argument);
  } else if (node.type === "Identifier") {
    this.checkDuplicateExports(node, node.name);
  }
};

pp$1.checkDuplicateExports = function (node, name) {
  if (this.state.exportedIdentifiers.indexOf(name) > -1) {
    this.raiseDuplicateExportError(node, name);
  }
  this.state.exportedIdentifiers.push(name);
};

pp$1.raiseDuplicateExportError = function (node, name) {
  this.raise(node.start, name === "default" ? "Only one default export allowed per module." : "`" + name + "` has already been exported. Exported identifiers must be unique.");
};

// Parses a comma-separated list of module exports.

pp$1.parseExportSpecifiers = function () {
  var nodes = [];
  var first = true;
  var needsFrom = void 0;

  // export { x, y as z } [from '...']
  this.expect(types.braceL);

  while (!this.eat(types.braceR)) {
    if (first) {
      first = false;
    } else {
      this.expect(types.comma);
      if (this.eat(types.braceR)) break;
    }

    var isDefault = this.match(types._default);
    if (isDefault && !needsFrom) needsFrom = true;

    var node = this.startNode();
    node.local = this.parseIdentifier(isDefault);
    node.exported = this.eatContextual("as") ? this.parseIdentifier(true) : node.local.__clone();
    nodes.push(this.finishNode(node, "ExportSpecifier"));
  }

  // https://github.com/ember-cli/ember-cli/pull/3739
  if (needsFrom && !this.isContextual("from")) {
    this.unexpected();
  }

  return nodes;
};

// Parses import declaration.

pp$1.parseImport = function (node) {
  this.eat(types._import);

  // import '...'
  if (this.match(types.string)) {
    node.specifiers = [];
    node.source = this.parseExprAtom();
  } else {
    node.specifiers = [];
    this.parseImportSpecifiers(node);
    this.expectContextual("from");
    node.source = this.match(types.string) ? this.parseExprAtom() : this.unexpected();
  }
  this.semicolon();
  return this.finishNode(node, "ImportDeclaration");
};

// Parses a comma-separated list of module imports.

pp$1.parseImportSpecifiers = function (node) {
  var first = true;
  if (this.match(types.name)) {
    // import defaultObj, { x, y as z } from '...'
    var startPos = this.state.start;
    var startLoc = this.state.startLoc;
    node.specifiers.push(this.parseImportSpecifierDefault(this.parseIdentifier(), startPos, startLoc));
    if (!this.eat(types.comma)) return;
  }

  if (this.match(types.star)) {
    var specifier = this.startNode();
    this.next();
    this.expectContextual("as");
    specifier.local = this.parseIdentifier();
    this.checkLVal(specifier.local, true, undefined, "import namespace specifier");
    node.specifiers.push(this.finishNode(specifier, "ImportNamespaceSpecifier"));
    return;
  }

  this.expect(types.braceL);
  while (!this.eat(types.braceR)) {
    if (first) {
      first = false;
    } else {
      // Detect an attempt to deep destructure
      if (this.eat(types.colon)) {
        this.unexpected(null, "ES2015 named imports do not destructure. Use another statement for destructuring after the import.");
      }

      this.expect(types.comma);
      if (this.eat(types.braceR)) break;
    }

    this.parseImportSpecifier(node);
  }
};

pp$1.parseImportSpecifier = function (node) {
  var specifier = this.startNode();
  specifier.imported = this.parseIdentifier(true);
  if (this.eatContextual("as")) {
    specifier.local = this.parseIdentifier();
  } else {
    this.checkReservedWord(specifier.imported.name, specifier.start, true, true);
    specifier.local = specifier.imported.__clone();
  }
  this.checkLVal(specifier.local, true, undefined, "import specifier");
  node.specifiers.push(this.finishNode(specifier, "ImportSpecifier"));
};

pp$1.parseImportSpecifierDefault = function (id, startPos, startLoc) {
  var node = this.startNodeAt(startPos, startLoc);
  node.local = id;
  this.checkLVal(node.local, true, undefined, "default import specifier");
  return this.finishNode(node, "ImportDefaultSpecifier");
};

var pp$2 = Parser.prototype;

// Convert existing expression atom to assignable pattern
// if possible.

pp$2.toAssignable = function (node, isBinding, contextDescription) {
  if (node) {
    switch (node.type) {
      case "Identifier":
      case "ObjectPattern":
      case "ArrayPattern":
      case "AssignmentPattern":
        break;

      case "ObjectExpression":
        node.type = "ObjectPattern";
        for (var _iterator = node.properties, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
          var _ref;

          if (_isArray) {
            if (_i >= _iterator.length) break;
            _ref = _iterator[_i++];
          } else {
            _i = _iterator.next();
            if (_i.done) break;
            _ref = _i.value;
          }

          var prop = _ref;

          if (prop.type === "ObjectMethod") {
            if (prop.kind === "get" || prop.kind === "set") {
              this.raise(prop.key.start, "Object pattern can't contain getter or setter");
            } else {
              this.raise(prop.key.start, "Object pattern can't contain methods");
            }
          } else {
            this.toAssignable(prop, isBinding, "object destructuring pattern");
          }
        }
        break;

      case "ObjectProperty":
        this.toAssignable(node.value, isBinding, contextDescription);
        break;

      case "SpreadProperty":
        node.type = "RestProperty";
        var arg = node.argument;
        this.toAssignable(arg, isBinding, contextDescription);
        break;

      case "ArrayExpression":
        node.type = "ArrayPattern";
        this.toAssignableList(node.elements, isBinding, contextDescription);
        break;

      case "AssignmentExpression":
        if (node.operator === "=") {
          node.type = "AssignmentPattern";
          delete node.operator;
        } else {
          this.raise(node.left.end, "Only '=' operator can be used for specifying default value.");
        }
        break;

      case "MemberExpression":
        if (!isBinding) break;

      default:
        {
          var message = "Invalid left-hand side" + (contextDescription ? " in " + contextDescription : /* istanbul ignore next */"expression");
          this.raise(node.start, message);
        }
    }
  }
  return node;
};

// Convert list of expression atoms to binding list.

pp$2.toAssignableList = function (exprList, isBinding, contextDescription) {
  var end = exprList.length;
  if (end) {
    var last = exprList[end - 1];
    if (last && last.type === "RestElement") {
      --end;
    } else if (last && last.type === "SpreadElement") {
      last.type = "RestElement";
      var arg = last.argument;
      this.toAssignable(arg, isBinding, contextDescription);
      if (arg.type !== "Identifier" && arg.type !== "MemberExpression" && arg.type !== "ArrayPattern") {
        this.unexpected(arg.start);
      }
      --end;
    }
  }
  for (var i = 0; i < end; i++) {
    var elt = exprList[i];
    if (elt) this.toAssignable(elt, isBinding, contextDescription);
  }
  return exprList;
};

// Convert list of expression atoms to a list of

pp$2.toReferencedList = function (exprList) {
  return exprList;
};

// Parses spread element.

pp$2.parseSpread = function (refShorthandDefaultPos) {
  var node = this.startNode();
  this.next();
  node.argument = this.parseMaybeAssign(false, refShorthandDefaultPos);
  return this.finishNode(node, "SpreadElement");
};

pp$2.parseRest = function () {
  var node = this.startNode();
  this.next();
  node.argument = this.parseBindingIdentifier();
  return this.finishNode(node, "RestElement");
};

pp$2.shouldAllowYieldIdentifier = function () {
  return this.match(types._yield) && !this.state.strict && !this.state.inGenerator;
};

pp$2.parseBindingIdentifier = function () {
  return this.parseIdentifier(this.shouldAllowYieldIdentifier());
};

// Parses lvalue (assignable) atom.

pp$2.parseBindingAtom = function () {
  switch (this.state.type) {
    case types._yield:
      if (this.state.strict || this.state.inGenerator) this.unexpected();
    // fall-through
    case types.name:
      return this.parseIdentifier(true);

    case types.bracketL:
      var node = this.startNode();
      this.next();
      node.elements = this.parseBindingList(types.bracketR, true);
      return this.finishNode(node, "ArrayPattern");

    case types.braceL:
      return this.parseObj(true);

    default:
      this.unexpected();
  }
};

pp$2.parseBindingList = function (close, allowEmpty) {
  var elts = [];
  var first = true;
  while (!this.eat(close)) {
    if (first) {
      first = false;
    } else {
      this.expect(types.comma);
    }
    if (allowEmpty && this.match(types.comma)) {
      elts.push(null);
    } else if (this.eat(close)) {
      break;
    } else if (this.match(types.ellipsis)) {
      elts.push(this.parseAssignableListItemTypes(this.parseRest()));
      this.expect(close);
      break;
    } else {
      var decorators = [];
      while (this.match(types.at)) {
        decorators.push(this.parseDecorator());
      }
      var left = this.parseMaybeDefault();
      if (decorators.length) {
        left.decorators = decorators;
      }
      this.parseAssignableListItemTypes(left);
      elts.push(this.parseMaybeDefault(left.start, left.loc.start, left));
    }
  }
  return elts;
};

pp$2.parseAssignableListItemTypes = function (param) {
  return param;
};

// Parses assignment pattern around given atom if possible.

pp$2.parseMaybeDefault = function (startPos, startLoc, left) {
  startLoc = startLoc || this.state.startLoc;
  startPos = startPos || this.state.start;
  left = left || this.parseBindingAtom();
  if (!this.eat(types.eq)) return left;

  var node = this.startNodeAt(startPos, startLoc);
  node.left = left;
  node.right = this.parseMaybeAssign();
  return this.finishNode(node, "AssignmentPattern");
};

// Verify that a node is an lval — something that can be assigned
// to.

pp$2.checkLVal = function (expr, isBinding, checkClashes, contextDescription) {
  switch (expr.type) {
    case "Identifier":
      this.checkReservedWord(expr.name, expr.start, false, true);

      if (checkClashes) {
        // we need to prefix this with an underscore for the cases where we have a key of
        // `__proto__`. there's a bug in old V8 where the following wouldn't work:
        //
        //   > var obj = Object.create(null);
        //   undefined
        //   > obj.__proto__
        //   null
        //   > obj.__proto__ = true;
        //   true
        //   > obj.__proto__
        //   null
        var key = "_" + expr.name;

        if (checkClashes[key]) {
          this.raise(expr.start, "Argument name clash in strict mode");
        } else {
          checkClashes[key] = true;
        }
      }
      break;

    case "MemberExpression":
      if (isBinding) this.raise(expr.start, (isBinding ? "Binding" : "Assigning to") + " member expression");
      break;

    case "ObjectPattern":
      for (var _iterator2 = expr.properties, _isArray2 = Array.isArray(_iterator2), _i2 = 0, _iterator2 = _isArray2 ? _iterator2 : _iterator2[Symbol.iterator]();;) {
        var _ref2;

        if (_isArray2) {
          if (_i2 >= _iterator2.length) break;
          _ref2 = _iterator2[_i2++];
        } else {
          _i2 = _iterator2.next();
          if (_i2.done) break;
          _ref2 = _i2.value;
        }

        var prop = _ref2;

        if (prop.type === "ObjectProperty") prop = prop.value;
        this.checkLVal(prop, isBinding, checkClashes, "object destructuring pattern");
      }
      break;

    case "ArrayPattern":
      for (var _iterator3 = expr.elements, _isArray3 = Array.isArray(_iterator3), _i3 = 0, _iterator3 = _isArray3 ? _iterator3 : _iterator3[Symbol.iterator]();;) {
        var _ref3;

        if (_isArray3) {
          if (_i3 >= _iterator3.length) break;
          _ref3 = _iterator3[_i3++];
        } else {
          _i3 = _iterator3.next();
          if (_i3.done) break;
          _ref3 = _i3.value;
        }

        var elem = _ref3;

        if (elem) this.checkLVal(elem, isBinding, checkClashes, "array destructuring pattern");
      }
      break;

    case "AssignmentPattern":
      this.checkLVal(expr.left, isBinding, checkClashes, "assignment pattern");
      break;

    case "RestProperty":
      this.checkLVal(expr.argument, isBinding, checkClashes, "rest property");
      break;

    case "RestElement":
      this.checkLVal(expr.argument, isBinding, checkClashes, "rest element");
      break;

    default:
      {
        var message = (isBinding ? /* istanbul ignore next */"Binding invalid" : "Invalid") + " left-hand side" + (contextDescription ? " in " + contextDescription : /* istanbul ignore next */"expression");
        this.raise(expr.start, message);
      }
  }
};

/* eslint max-len: 0 */

// A recursive descent parser operates by defining functions for all
// syntactic elements, and recursively calling those, each function
// advancing the input stream and returning an AST node. Precedence
// of constructs (for example, the fact that `!x[1]` means `!(x[1])`
// instead of `(!x)[1]` is handled by the fact that the parser
// function that parses unary prefix operators is called first, and
// in turn calls the function that parses `[]` subscripts — that
// way, it'll receive the node for `x[1]` already parsed, and wraps
// *that* in the unary operator node.
//
// Acorn uses an [operator precedence parser][opp] to handle binary
// operator precedence, because it is much more compact than using
// the technique outlined above, which uses different, nesting
// functions to specify precedence, for all of the ten binary
// precedence levels that JavaScript defines.
//
// [opp]: http://en.wikipedia.org/wiki/Operator-precedence_parser

var pp$3 = Parser.prototype;

// Check if property name clashes with already added.
// Object/class getters and setters are not allowed to clash —
// either with each other or with an init property — and in
// strict mode, init properties are also not allowed to be repeated.

pp$3.checkPropClash = function (prop, propHash) {
  if (prop.computed || prop.kind) return;

  var key = prop.key;
  // It is either an Identifier or a String/NumericLiteral
  var name = key.type === "Identifier" ? key.name : String(key.value);

  if (name === "__proto__") {
    if (propHash.proto) this.raise(key.start, "Redefinition of __proto__ property");
    propHash.proto = true;
  }
};

// Convenience method to parse an Expression only
pp$3.getExpression = function () {
  this.nextToken();
  var expr = this.parseExpression();
  if (!this.match(types.eof)) {
    this.unexpected();
  }
  return expr;
};

// ### Expression parsing

// These nest, from the most general expression type at the top to
// 'atomic', nondivisible expression types at the bottom. Most of
// the functions will simply let the function (s) below them parse,
// and, *if* the syntactic construct they handle is present, wrap
// the AST node that the inner parser gave them in another node.

// Parse a full expression. The optional arguments are used to
// forbid the `in` operator (in for loops initialization expressions)
// and provide reference for storing '=' operator inside shorthand
// property assignment in contexts where both object expression
// and object pattern might appear (so it's possible to raise
// delayed syntax error at correct position).

pp$3.parseExpression = function (noIn, refShorthandDefaultPos) {
  var startPos = this.state.start;
  var startLoc = this.state.startLoc;
  var expr = this.parseMaybeAssign(noIn, refShorthandDefaultPos);
  if (this.match(types.comma)) {
    var node = this.startNodeAt(startPos, startLoc);
    node.expressions = [expr];
    while (this.eat(types.comma)) {
      node.expressions.push(this.parseMaybeAssign(noIn, refShorthandDefaultPos));
    }
    this.toReferencedList(node.expressions);
    return this.finishNode(node, "SequenceExpression");
  }
  return expr;
};

// Parse an assignment expression. This includes applications of
// operators like `+=`.

pp$3.parseMaybeAssign = function (noIn, refShorthandDefaultPos, afterLeftParse, refNeedsArrowPos) {
  var startPos = this.state.start;
  var startLoc = this.state.startLoc;

  if (this.match(types._yield) && this.state.inGenerator) {
    var _left = this.parseYield();
    if (afterLeftParse) _left = afterLeftParse.call(this, _left, startPos, startLoc);
    return _left;
  }

  var failOnShorthandAssign = void 0;
  if (refShorthandDefaultPos) {
    failOnShorthandAssign = false;
  } else {
    refShorthandDefaultPos = { start: 0 };
    failOnShorthandAssign = true;
  }

  if (this.match(types.parenL) || this.match(types.name)) {
    this.state.potentialArrowAt = this.state.start;
  }

  var left = this.parseMaybeConditional(noIn, refShorthandDefaultPos, refNeedsArrowPos);
  if (afterLeftParse) left = afterLeftParse.call(this, left, startPos, startLoc);
  if (this.state.type.isAssign) {
    var node = this.startNodeAt(startPos, startLoc);
    node.operator = this.state.value;
    node.left = this.match(types.eq) ? this.toAssignable(left, undefined, "assignment expression") : left;
    refShorthandDefaultPos.start = 0; // reset because shorthand default was used correctly

    this.checkLVal(left, undefined, undefined, "assignment expression");

    if (left.extra && left.extra.parenthesized) {
      var errorMsg = void 0;
      if (left.type === "ObjectPattern") {
        errorMsg = "`({a}) = 0` use `({a} = 0)`";
      } else if (left.type === "ArrayPattern") {
        errorMsg = "`([a]) = 0` use `([a] = 0)`";
      }
      if (errorMsg) {
        this.raise(left.start, "You're trying to assign to a parenthesized expression, eg. instead of " + errorMsg);
      }
    }

    this.next();
    node.right = this.parseMaybeAssign(noIn);
    return this.finishNode(node, "AssignmentExpression");
  } else if (failOnShorthandAssign && refShorthandDefaultPos.start) {
    this.unexpected(refShorthandDefaultPos.start);
  }

  return left;
};

// Parse a ternary conditional (`?:`) operator.

pp$3.parseMaybeConditional = function (noIn, refShorthandDefaultPos, refNeedsArrowPos) {
  var startPos = this.state.start;
  var startLoc = this.state.startLoc;
  var expr = this.parseExprOps(noIn, refShorthandDefaultPos);
  if (refShorthandDefaultPos && refShorthandDefaultPos.start) return expr;

  return this.parseConditional(expr, noIn, startPos, startLoc, refNeedsArrowPos);
};

pp$3.parseConditional = function (expr, noIn, startPos, startLoc) {
  if (this.eat(types.question)) {
    var node = this.startNodeAt(startPos, startLoc);
    node.test = expr;
    node.consequent = this.parseMaybeAssign();
    this.expect(types.colon);
    node.alternate = this.parseMaybeAssign(noIn);
    return this.finishNode(node, "ConditionalExpression");
  }
  return expr;
};

// Start the precedence parser.

pp$3.parseExprOps = function (noIn, refShorthandDefaultPos) {
  var startPos = this.state.start;
  var startLoc = this.state.startLoc;
  var expr = this.parseMaybeUnary(refShorthandDefaultPos);
  if (refShorthandDefaultPos && refShorthandDefaultPos.start) {
    return expr;
  } else {
    return this.parseExprOp(expr, startPos, startLoc, -1, noIn);
  }
};

// Parse binary operators with the operator precedence parsing
// algorithm. `left` is the left-hand side of the operator.
// `minPrec` provides context that allows the function to stop and
// defer further parser to one of its callers when it encounters an
// operator that has a lower precedence than the set it is parsing.

pp$3.parseExprOp = function (left, leftStartPos, leftStartLoc, minPrec, noIn) {
  var prec = this.state.type.binop;
  if (prec != null && (!noIn || !this.match(types._in))) {
    if (prec > minPrec) {
      var node = this.startNodeAt(leftStartPos, leftStartLoc);
      node.left = left;
      node.operator = this.state.value;

      if (node.operator === "**" && left.type === "UnaryExpression" && left.extra && !left.extra.parenthesizedArgument && !left.extra.parenthesized) {
        this.raise(left.argument.start, "Illegal expression. Wrap left hand side or entire exponentiation in parentheses.");
      }

      var op = this.state.type;
      this.next();

      var startPos = this.state.start;
      var startLoc = this.state.startLoc;
      node.right = this.parseExprOp(this.parseMaybeUnary(), startPos, startLoc, op.rightAssociative ? prec - 1 : prec, noIn);

      this.finishNode(node, op === types.logicalOR || op === types.logicalAND ? "LogicalExpression" : "BinaryExpression");
      return this.parseExprOp(node, leftStartPos, leftStartLoc, minPrec, noIn);
    }
  }
  return left;
};

// Parse unary operators, both prefix and postfix.

pp$3.parseMaybeUnary = function (refShorthandDefaultPos) {
  if (this.state.type.prefix) {
    var node = this.startNode();
    var update = this.match(types.incDec);
    node.operator = this.state.value;
    node.prefix = true;
    this.next();

    var argType = this.state.type;
    node.argument = this.parseMaybeUnary();

    this.addExtra(node, "parenthesizedArgument", argType === types.parenL && (!node.argument.extra || !node.argument.extra.parenthesized));

    if (refShorthandDefaultPos && refShorthandDefaultPos.start) {
      this.unexpected(refShorthandDefaultPos.start);
    }

    if (update) {
      this.checkLVal(node.argument, undefined, undefined, "prefix operation");
    } else if (this.state.strict && node.operator === "delete" && node.argument.type === "Identifier") {
      this.raise(node.start, "Deleting local variable in strict mode");
    }

    return this.finishNode(node, update ? "UpdateExpression" : "UnaryExpression");
  }

  var startPos = this.state.start;
  var startLoc = this.state.startLoc;
  var expr = this.parseExprSubscripts(refShorthandDefaultPos);
  if (refShorthandDefaultPos && refShorthandDefaultPos.start) return expr;
  while (this.state.type.postfix && !this.canInsertSemicolon()) {
    var _node = this.startNodeAt(startPos, startLoc);
    _node.operator = this.state.value;
    _node.prefix = false;
    _node.argument = expr;
    this.checkLVal(expr, undefined, undefined, "postfix operation");
    this.next();
    expr = this.finishNode(_node, "UpdateExpression");
  }
  return expr;
};

// Parse call, dot, and `[]`-subscript expressions.

pp$3.parseExprSubscripts = function (refShorthandDefaultPos) {
  var startPos = this.state.start;
  var startLoc = this.state.startLoc;
  var potentialArrowAt = this.state.potentialArrowAt;
  var expr = this.parseExprAtom(refShorthandDefaultPos);

  if (expr.type === "ArrowFunctionExpression" && expr.start === potentialArrowAt) {
    return expr;
  }

  if (refShorthandDefaultPos && refShorthandDefaultPos.start) {
    return expr;
  }

  return this.parseSubscripts(expr, startPos, startLoc);
};

pp$3.parseSubscripts = function (base, startPos, startLoc, noCalls) {
  for (;;) {
    if (!noCalls && this.eat(types.doubleColon)) {
      var node = this.startNodeAt(startPos, startLoc);
      node.object = base;
      node.callee = this.parseNoCallExpr();
      return this.parseSubscripts(this.finishNode(node, "BindExpression"), startPos, startLoc, noCalls);
    } else if (this.eat(types.dot)) {
      var _node2 = this.startNodeAt(startPos, startLoc);
      _node2.object = base;
      _node2.property = this.parseIdentifier(true);
      _node2.computed = false;
      base = this.finishNode(_node2, "MemberExpression");
    } else if (this.eat(types.bracketL)) {
      var _node3 = this.startNodeAt(startPos, startLoc);
      _node3.object = base;
      _node3.property = this.parseExpression();
      _node3.computed = true;
      this.expect(types.bracketR);
      base = this.finishNode(_node3, "MemberExpression");
    } else if (!noCalls && this.match(types.parenL)) {
      var possibleAsync = this.state.potentialArrowAt === base.start && base.type === "Identifier" && base.name === "async" && !this.canInsertSemicolon();
      this.next();

      var _node4 = this.startNodeAt(startPos, startLoc);
      _node4.callee = base;
      _node4.arguments = this.parseCallExpressionArguments(types.parenR, possibleAsync);
      if (_node4.callee.type === "Import" && _node4.arguments.length !== 1) {
        this.raise(_node4.start, "import() requires exactly one argument");
      }
      base = this.finishNode(_node4, "CallExpression");

      if (possibleAsync && this.shouldParseAsyncArrow()) {
        return this.parseAsyncArrowFromCallExpression(this.startNodeAt(startPos, startLoc), _node4);
      } else {
        this.toReferencedList(_node4.arguments);
      }
    } else if (this.match(types.backQuote)) {
      var _node5 = this.startNodeAt(startPos, startLoc);
      _node5.tag = base;
      _node5.quasi = this.parseTemplate(true);
      base = this.finishNode(_node5, "TaggedTemplateExpression");
    } else {
      return base;
    }
  }
};

pp$3.parseCallExpressionArguments = function (close, possibleAsyncArrow) {
  var elts = [];
  var innerParenStart = void 0;
  var first = true;

  while (!this.eat(close)) {
    if (first) {
      first = false;
    } else {
      this.expect(types.comma);
      if (this.eat(close)) break;
    }

    // we need to make sure that if this is an async arrow functions, that we don't allow inner parens inside the params
    if (this.match(types.parenL) && !innerParenStart) {
      innerParenStart = this.state.start;
    }

    elts.push(this.parseExprListItem(false, possibleAsyncArrow ? { start: 0 } : undefined, possibleAsyncArrow ? { start: 0 } : undefined));
  }

  // we found an async arrow function so let's not allow any inner parens
  if (possibleAsyncArrow && innerParenStart && this.shouldParseAsyncArrow()) {
    this.unexpected();
  }

  return elts;
};

pp$3.shouldParseAsyncArrow = function () {
  return this.match(types.arrow);
};

pp$3.parseAsyncArrowFromCallExpression = function (node, call) {
  this.expect(types.arrow);
  return this.parseArrowExpression(node, call.arguments, true);
};

// Parse a no-call expression (like argument of `new` or `::` operators).

pp$3.parseNoCallExpr = function () {
  var startPos = this.state.start;
  var startLoc = this.state.startLoc;
  return this.parseSubscripts(this.parseExprAtom(), startPos, startLoc, true);
};

// Parse an atomic expression — either a single token that is an
// expression, an expression started by a keyword like `function` or
// `new`, or an expression wrapped in punctuation like `()`, `[]`,
// or `{}`.

pp$3.parseExprAtom = function (refShorthandDefaultPos) {
  var canBeArrow = this.state.potentialArrowAt === this.state.start;
  var node = void 0;

  switch (this.state.type) {
    case types._super:
      if (!this.state.inMethod && !this.state.inClassProperty && !this.options.allowSuperOutsideMethod) {
        this.raise(this.state.start, "'super' outside of function or class");
      }

      node = this.startNode();
      this.next();
      if (!this.match(types.parenL) && !this.match(types.bracketL) && !this.match(types.dot)) {
        this.unexpected();
      }
      if (this.match(types.parenL) && this.state.inMethod !== "constructor" && !this.options.allowSuperOutsideMethod) {
        this.raise(node.start, "super() outside of class constructor");
      }
      return this.finishNode(node, "Super");

    case types._import:
      if (!this.hasPlugin("dynamicImport")) this.unexpected();

      node = this.startNode();
      this.next();
      if (!this.match(types.parenL)) {
        this.unexpected(null, types.parenL);
      }
      return this.finishNode(node, "Import");

    case types._this:
      node = this.startNode();
      this.next();
      return this.finishNode(node, "ThisExpression");

    case types._yield:
      if (this.state.inGenerator) this.unexpected();

    case types.name:
      node = this.startNode();
      var allowAwait = this.state.value === "await" && this.state.inAsync;
      var allowYield = this.shouldAllowYieldIdentifier();
      var id = this.parseIdentifier(allowAwait || allowYield);

      if (id.name === "await") {
        if (this.state.inAsync || this.inModule) {
          return this.parseAwait(node);
        }
      } else if (id.name === "async" && this.match(types._function) && !this.canInsertSemicolon()) {
        this.next();
        return this.parseFunction(node, false, false, true);
      } else if (canBeArrow && id.name === "async" && this.match(types.name)) {
        var params = [this.parseIdentifier()];
        this.expect(types.arrow);
        // let foo = bar => {};
        return this.parseArrowExpression(node, params, true);
      }

      if (canBeArrow && !this.canInsertSemicolon() && this.eat(types.arrow)) {
        return this.parseArrowExpression(node, [id]);
      }

      return id;

    case types._do:
      if (this.hasPlugin("doExpressions")) {
        var _node6 = this.startNode();
        this.next();
        var oldInFunction = this.state.inFunction;
        var oldLabels = this.state.labels;
        this.state.labels = [];
        this.state.inFunction = false;
        _node6.body = this.parseBlock(false, true);
        this.state.inFunction = oldInFunction;
        this.state.labels = oldLabels;
        return this.finishNode(_node6, "DoExpression");
      }

    case types.regexp:
      var value = this.state.value;
      node = this.parseLiteral(value.value, "RegExpLiteral");
      node.pattern = value.pattern;
      node.flags = value.flags;
      return node;

    case types.num:
      return this.parseLiteral(this.state.value, "NumericLiteral");

    case types.string:
      return this.parseLiteral(this.state.value, "StringLiteral");

    case types._null:
      node = this.startNode();
      this.next();
      return this.finishNode(node, "NullLiteral");

    case types._true:case types._false:
      node = this.startNode();
      node.value = this.match(types._true);
      this.next();
      return this.finishNode(node, "BooleanLiteral");

    case types.parenL:
      return this.parseParenAndDistinguishExpression(null, null, canBeArrow);

    case types.bracketL:
      node = this.startNode();
      this.next();
      node.elements = this.parseExprList(types.bracketR, true, refShorthandDefaultPos);
      this.toReferencedList(node.elements);
      return this.finishNode(node, "ArrayExpression");

    case types.braceL:
      return this.parseObj(false, refShorthandDefaultPos);

    case types._function:
      return this.parseFunctionExpression();

    case types.at:
      this.parseDecorators();

    case types._class:
      node = this.startNode();
      this.takeDecorators(node);
      return this.parseClass(node, false);

    case types._new:
      return this.parseNew();

    case types.backQuote:
      return this.parseTemplate(false);

    case types.doubleColon:
      node = this.startNode();
      this.next();
      node.object = null;
      var callee = node.callee = this.parseNoCallExpr();
      if (callee.type === "MemberExpression") {
        return this.finishNode(node, "BindExpression");
      } else {
        this.raise(callee.start, "Binding should be performed on object property.");
      }

    default:
      this.unexpected();
  }
};

pp$3.parseFunctionExpression = function () {
  var node = this.startNode();
  var meta = this.parseIdentifier(true);
  if (this.state.inGenerator && this.eat(types.dot) && this.hasPlugin("functionSent")) {
    return this.parseMetaProperty(node, meta, "sent");
  } else {
    return this.parseFunction(node, false);
  }
};

pp$3.parseMetaProperty = function (node, meta, propertyName) {
  node.meta = meta;
  node.property = this.parseIdentifier(true);

  if (node.property.name !== propertyName) {
    this.raise(node.property.start, "The only valid meta property for new is " + meta.name + "." + propertyName);
  }

  return this.finishNode(node, "MetaProperty");
};

pp$3.parseLiteral = function (value, type, startPos, startLoc) {
  startPos = startPos || this.state.start;
  startLoc = startLoc || this.state.startLoc;

  var node = this.startNodeAt(startPos, startLoc);
  this.addExtra(node, "rawValue", value);
  this.addExtra(node, "raw", this.input.slice(startPos, this.state.end));
  node.value = value;
  this.next();
  return this.finishNode(node, type);
};

pp$3.parseParenExpression = function () {
  this.expect(types.parenL);
  var val = this.parseExpression();
  this.expect(types.parenR);
  return val;
};

pp$3.parseParenAndDistinguishExpression = function (startPos, startLoc, canBeArrow) {
  startPos = startPos || this.state.start;
  startLoc = startLoc || this.state.startLoc;

  var val = void 0;
  this.expect(types.parenL);

  var innerStartPos = this.state.start;
  var innerStartLoc = this.state.startLoc;
  var exprList = [];
  var refShorthandDefaultPos = { start: 0 };
  var refNeedsArrowPos = { start: 0 };
  var first = true;
  var spreadStart = void 0;
  var optionalCommaStart = void 0;

  while (!this.match(types.parenR)) {
    if (first) {
      first = false;
    } else {
      this.expect(types.comma, refNeedsArrowPos.start || null);
      if (this.match(types.parenR)) {
        optionalCommaStart = this.state.start;
        break;
      }
    }

    if (this.match(types.ellipsis)) {
      var spreadNodeStartPos = this.state.start;
      var spreadNodeStartLoc = this.state.startLoc;
      spreadStart = this.state.start;
      exprList.push(this.parseParenItem(this.parseRest(), spreadNodeStartPos, spreadNodeStartLoc));
      break;
    } else {
      exprList.push(this.parseMaybeAssign(false, refShorthandDefaultPos, this.parseParenItem, refNeedsArrowPos));
    }
  }

  var innerEndPos = this.state.start;
  var innerEndLoc = this.state.startLoc;
  this.expect(types.parenR);

  var arrowNode = this.startNodeAt(startPos, startLoc);
  if (canBeArrow && this.shouldParseArrow() && (arrowNode = this.parseArrow(arrowNode))) {
    for (var _iterator = exprList, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
      var _ref;

      if (_isArray) {
        if (_i >= _iterator.length) break;
        _ref = _iterator[_i++];
      } else {
        _i = _iterator.next();
        if (_i.done) break;
        _ref = _i.value;
      }

      var param = _ref;

      if (param.extra && param.extra.parenthesized) this.unexpected(param.extra.parenStart);
    }

    return this.parseArrowExpression(arrowNode, exprList);
  }

  if (!exprList.length) {
    this.unexpected(this.state.lastTokStart);
  }
  if (optionalCommaStart) this.unexpected(optionalCommaStart);
  if (spreadStart) this.unexpected(spreadStart);
  if (refShorthandDefaultPos.start) this.unexpected(refShorthandDefaultPos.start);
  if (refNeedsArrowPos.start) this.unexpected(refNeedsArrowPos.start);

  if (exprList.length > 1) {
    val = this.startNodeAt(innerStartPos, innerStartLoc);
    val.expressions = exprList;
    this.toReferencedList(val.expressions);
    this.finishNodeAt(val, "SequenceExpression", innerEndPos, innerEndLoc);
  } else {
    val = exprList[0];
  }

  this.addExtra(val, "parenthesized", true);
  this.addExtra(val, "parenStart", startPos);

  return val;
};

pp$3.shouldParseArrow = function () {
  return !this.canInsertSemicolon();
};

pp$3.parseArrow = function (node) {
  if (this.eat(types.arrow)) {
    return node;
  }
};

pp$3.parseParenItem = function (node) {
  return node;
};

// New's precedence is slightly tricky. It must allow its argument
// to be a `[]` or dot subscript expression, but not a call — at
// least, not without wrapping it in parentheses. Thus, it uses the

pp$3.parseNew = function () {
  var node = this.startNode();
  var meta = this.parseIdentifier(true);

  if (this.eat(types.dot)) {
    var metaProp = this.parseMetaProperty(node, meta, "target");

    if (!this.state.inFunction) {
      this.raise(metaProp.property.start, "new.target can only be used in functions");
    }

    return metaProp;
  }

  node.callee = this.parseNoCallExpr();

  if (this.eat(types.parenL)) {
    node.arguments = this.parseExprList(types.parenR);
    this.toReferencedList(node.arguments);
  } else {
    node.arguments = [];
  }

  return this.finishNode(node, "NewExpression");
};

// Parse template expression.

pp$3.parseTemplateElement = function (isTagged) {
  var elem = this.startNode();
  if (this.state.value === null) {
    if (!isTagged || !this.hasPlugin("templateInvalidEscapes")) {
      this.raise(this.state.invalidTemplateEscapePosition, "Invalid escape sequence in template");
    } else {
      this.state.invalidTemplateEscapePosition = null;
    }
  }
  elem.value = {
    raw: this.input.slice(this.state.start, this.state.end).replace(/\r\n?/g, "\n"),
    cooked: this.state.value
  };
  this.next();
  elem.tail = this.match(types.backQuote);
  return this.finishNode(elem, "TemplateElement");
};

pp$3.parseTemplate = function (isTagged) {
  var node = this.startNode();
  this.next();
  node.expressions = [];
  var curElt = this.parseTemplateElement(isTagged);
  node.quasis = [curElt];
  while (!curElt.tail) {
    this.expect(types.dollarBraceL);
    node.expressions.push(this.parseExpression());
    this.expect(types.braceR);
    node.quasis.push(curElt = this.parseTemplateElement(isTagged));
  }
  this.next();
  return this.finishNode(node, "TemplateLiteral");
};

// Parse an object literal or binding pattern.

pp$3.parseObj = function (isPattern, refShorthandDefaultPos) {
  var decorators = [];
  var propHash = Object.create(null);
  var first = true;
  var node = this.startNode();

  node.properties = [];
  this.next();

  var firstRestLocation = null;

  while (!this.eat(types.braceR)) {
    if (first) {
      first = false;
    } else {
      this.expect(types.comma);
      if (this.eat(types.braceR)) break;
    }

    while (this.match(types.at)) {
      decorators.push(this.parseDecorator());
    }

    var prop = this.startNode(),
        isGenerator = false,
        isAsync = false,
        startPos = void 0,
        startLoc = void 0;
    if (decorators.length) {
      prop.decorators = decorators;
      decorators = [];
    }

    if (this.hasPlugin("objectRestSpread") && this.match(types.ellipsis)) {
      prop = this.parseSpread(isPattern ? { start: 0 } : undefined);
      prop.type = isPattern ? "RestProperty" : "SpreadProperty";
      if (isPattern) this.toAssignable(prop.argument, true, "object pattern");
      node.properties.push(prop);
      if (isPattern) {
        var position = this.state.start;
        if (firstRestLocation !== null) {
          this.unexpected(firstRestLocation, "Cannot have multiple rest elements when destructuring");
        } else if (this.eat(types.braceR)) {
          break;
        } else if (this.match(types.comma) && this.lookahead().type === types.braceR) {
          // TODO: temporary rollback
          // this.unexpected(position, "A trailing comma is not permitted after the rest element");
          continue;
        } else {
          firstRestLocation = position;
          continue;
        }
      } else {
        continue;
      }
    }

    prop.method = false;
    prop.shorthand = false;

    if (isPattern || refShorthandDefaultPos) {
      startPos = this.state.start;
      startLoc = this.state.startLoc;
    }

    if (!isPattern) {
      isGenerator = this.eat(types.star);
    }

    if (!isPattern && this.isContextual("async")) {
      if (isGenerator) this.unexpected();

      var asyncId = this.parseIdentifier();
      if (this.match(types.colon) || this.match(types.parenL) || this.match(types.braceR) || this.match(types.eq) || this.match(types.comma)) {
        prop.key = asyncId;
        prop.computed = false;
      } else {
        isAsync = true;
        if (this.hasPlugin("asyncGenerators")) isGenerator = this.eat(types.star);
        this.parsePropertyName(prop);
      }
    } else {
      this.parsePropertyName(prop);
    }

    this.parseObjPropValue(prop, startPos, startLoc, isGenerator, isAsync, isPattern, refShorthandDefaultPos);
    this.checkPropClash(prop, propHash);

    if (prop.shorthand) {
      this.addExtra(prop, "shorthand", true);
    }

    node.properties.push(prop);
  }

  if (firstRestLocation !== null) {
    this.unexpected(firstRestLocation, "The rest element has to be the last element when destructuring");
  }

  if (decorators.length) {
    this.raise(this.state.start, "You have trailing decorators with no property");
  }

  return this.finishNode(node, isPattern ? "ObjectPattern" : "ObjectExpression");
};

pp$3.isGetterOrSetterMethod = function (prop, isPattern) {
  return !isPattern && !prop.computed && prop.key.type === "Identifier" && (prop.key.name === "get" || prop.key.name === "set") && (this.match(types.string) || // get "string"() {}
  this.match(types.num) || // get 1() {}
  this.match(types.bracketL) || // get ["string"]() {}
  this.match(types.name) || // get foo() {}
  this.state.type.keyword // get debugger() {}
  );
};

// get methods aren't allowed to have any parameters
// set methods must have exactly 1 parameter
pp$3.checkGetterSetterParamCount = function (method) {
  var paramCount = method.kind === "get" ? 0 : 1;
  if (method.params.length !== paramCount) {
    var start = method.start;
    if (method.kind === "get") {
      this.raise(start, "getter should have no params");
    } else {
      this.raise(start, "setter should have exactly one param");
    }
  }
};

pp$3.parseObjectMethod = function (prop, isGenerator, isAsync, isPattern) {
  if (isAsync || isGenerator || this.match(types.parenL)) {
    if (isPattern) this.unexpected();
    prop.kind = "method";
    prop.method = true;
    this.parseMethod(prop, isGenerator, isAsync);

    return this.finishNode(prop, "ObjectMethod");
  }

  if (this.isGetterOrSetterMethod(prop, isPattern)) {
    if (isGenerator || isAsync) this.unexpected();
    prop.kind = prop.key.name;
    this.parsePropertyName(prop);
    this.parseMethod(prop);
    this.checkGetterSetterParamCount(prop);

    return this.finishNode(prop, "ObjectMethod");
  }
};

pp$3.parseObjectProperty = function (prop, startPos, startLoc, isPattern, refShorthandDefaultPos) {
  if (this.eat(types.colon)) {
    prop.value = isPattern ? this.parseMaybeDefault(this.state.start, this.state.startLoc) : this.parseMaybeAssign(false, refShorthandDefaultPos);

    return this.finishNode(prop, "ObjectProperty");
  }

  if (!prop.computed && prop.key.type === "Identifier") {
    this.checkReservedWord(prop.key.name, prop.key.start, true, true);

    if (isPattern) {
      prop.value = this.parseMaybeDefault(startPos, startLoc, prop.key.__clone());
    } else if (this.match(types.eq) && refShorthandDefaultPos) {
      if (!refShorthandDefaultPos.start) {
        refShorthandDefaultPos.start = this.state.start;
      }
      prop.value = this.parseMaybeDefault(startPos, startLoc, prop.key.__clone());
    } else {
      prop.value = prop.key.__clone();
    }
    prop.shorthand = true;

    return this.finishNode(prop, "ObjectProperty");
  }
};

pp$3.parseObjPropValue = function (prop, startPos, startLoc, isGenerator, isAsync, isPattern, refShorthandDefaultPos) {
  var node = this.parseObjectMethod(prop, isGenerator, isAsync, isPattern) || this.parseObjectProperty(prop, startPos, startLoc, isPattern, refShorthandDefaultPos);

  if (!node) this.unexpected();

  return node;
};

pp$3.parsePropertyName = function (prop) {
  if (this.eat(types.bracketL)) {
    prop.computed = true;
    prop.key = this.parseMaybeAssign();
    this.expect(types.bracketR);
  } else {
    prop.computed = false;
    var oldInPropertyName = this.state.inPropertyName;
    this.state.inPropertyName = true;
    prop.key = this.match(types.num) || this.match(types.string) ? this.parseExprAtom() : this.parseIdentifier(true);
    this.state.inPropertyName = oldInPropertyName;
  }
  return prop.key;
};

// Initialize empty function node.

pp$3.initFunction = function (node, isAsync) {
  node.id = null;
  node.generator = false;
  node.expression = false;
  node.async = !!isAsync;
};

// Parse object or class method.

pp$3.parseMethod = function (node, isGenerator, isAsync) {
  var oldInMethod = this.state.inMethod;
  this.state.inMethod = node.kind || true;
  this.initFunction(node, isAsync);
  this.expect(types.parenL);
  node.params = this.parseBindingList(types.parenR);
  node.generator = !!isGenerator;
  this.parseFunctionBody(node);
  this.state.inMethod = oldInMethod;
  return node;
};

// Parse arrow function expression with given parameters.

pp$3.parseArrowExpression = function (node, params, isAsync) {
  this.initFunction(node, isAsync);
  node.params = this.toAssignableList(params, true, "arrow function parameters");
  this.parseFunctionBody(node, true);
  return this.finishNode(node, "ArrowFunctionExpression");
};

pp$3.isStrictBody = function (node, isExpression) {
  if (!isExpression && node.body.directives.length) {
    for (var _iterator2 = node.body.directives, _isArray2 = Array.isArray(_iterator2), _i2 = 0, _iterator2 = _isArray2 ? _iterator2 : _iterator2[Symbol.iterator]();;) {
      var _ref2;

      if (_isArray2) {
        if (_i2 >= _iterator2.length) break;
        _ref2 = _iterator2[_i2++];
      } else {
        _i2 = _iterator2.next();
        if (_i2.done) break;
        _ref2 = _i2.value;
      }

      var directive = _ref2;

      if (directive.value.value === "use strict") {
        return true;
      }
    }
  }

  return false;
};

// Parse function body and check parameters.
pp$3.parseFunctionBody = function (node, allowExpression) {
  var isExpression = allowExpression && !this.match(types.braceL);

  var oldInAsync = this.state.inAsync;
  this.state.inAsync = node.async;
  if (isExpression) {
    node.body = this.parseMaybeAssign();
    node.expression = true;
  } else {
    // Start a new scope with regard to labels and the `inFunction`
    // flag (restore them to their old value afterwards).
    var oldInFunc = this.state.inFunction;
    var oldInGen = this.state.inGenerator;
    var oldLabels = this.state.labels;
    this.state.inFunction = true;this.state.inGenerator = node.generator;this.state.labels = [];
    node.body = this.parseBlock(true);
    node.expression = false;
    this.state.inFunction = oldInFunc;this.state.inGenerator = oldInGen;this.state.labels = oldLabels;
  }
  this.state.inAsync = oldInAsync;

  // If this is a strict mode function, verify that argument names
  // are not repeated, and it does not try to bind the words `eval`
  // or `arguments`.
  var isStrict = this.isStrictBody(node, isExpression);
  // Also check when allowExpression === true for arrow functions
  var checkLVal = this.state.strict || allowExpression || isStrict;

  if (isStrict && node.id && node.id.type === "Identifier" && node.id.name === "yield") {
    this.raise(node.id.start, "Binding yield in strict mode");
  }

  if (checkLVal) {
    var nameHash = Object.create(null);
    var oldStrict = this.state.strict;
    if (isStrict) this.state.strict = true;
    if (node.id) {
      this.checkLVal(node.id, true, undefined, "function name");
    }
    for (var _iterator3 = node.params, _isArray3 = Array.isArray(_iterator3), _i3 = 0, _iterator3 = _isArray3 ? _iterator3 : _iterator3[Symbol.iterator]();;) {
      var _ref3;

      if (_isArray3) {
        if (_i3 >= _iterator3.length) break;
        _ref3 = _iterator3[_i3++];
      } else {
        _i3 = _iterator3.next();
        if (_i3.done) break;
        _ref3 = _i3.value;
      }

      var param = _ref3;

      if (isStrict && param.type !== "Identifier") {
        this.raise(param.start, "Non-simple parameter in strict mode");
      }
      this.checkLVal(param, true, nameHash, "function parameter list");
    }
    this.state.strict = oldStrict;
  }
};

// Parses a comma-separated list of expressions, and returns them as
// an array. `close` is the token type that ends the list, and
// `allowEmpty` can be turned on to allow subsequent commas with
// nothing in between them to be parsed as `null` (which is needed
// for array literals).

pp$3.parseExprList = function (close, allowEmpty, refShorthandDefaultPos) {
  var elts = [];
  var first = true;

  while (!this.eat(close)) {
    if (first) {
      first = false;
    } else {
      this.expect(types.comma);
      if (this.eat(close)) break;
    }

    elts.push(this.parseExprListItem(allowEmpty, refShorthandDefaultPos));
  }
  return elts;
};

pp$3.parseExprListItem = function (allowEmpty, refShorthandDefaultPos, refNeedsArrowPos) {
  var elt = void 0;
  if (allowEmpty && this.match(types.comma)) {
    elt = null;
  } else if (this.match(types.ellipsis)) {
    elt = this.parseSpread(refShorthandDefaultPos);
  } else {
    elt = this.parseMaybeAssign(false, refShorthandDefaultPos, this.parseParenItem, refNeedsArrowPos);
  }
  return elt;
};

// Parse the next token as an identifier. If `liberal` is true (used
// when parsing properties), it will also convert keywords into
// identifiers.

pp$3.parseIdentifier = function (liberal) {
  var node = this.startNode();
  if (!liberal) {
    this.checkReservedWord(this.state.value, this.state.start, !!this.state.type.keyword, false);
  }

  if (this.match(types.name)) {
    node.name = this.state.value;
  } else if (this.state.type.keyword) {
    node.name = this.state.type.keyword;
  } else {
    this.unexpected();
  }

  if (!liberal && node.name === "await" && this.state.inAsync) {
    this.raise(node.start, "invalid use of await inside of an async function");
  }

  node.loc.identifierName = node.name;

  this.next();
  return this.finishNode(node, "Identifier");
};

pp$3.checkReservedWord = function (word, startLoc, checkKeywords, isBinding) {
  if (this.isReservedWord(word) || checkKeywords && this.isKeyword(word)) {
    this.raise(startLoc, word + " is a reserved word");
  }

  if (this.state.strict && (reservedWords.strict(word) || isBinding && reservedWords.strictBind(word))) {
    this.raise(startLoc, word + " is a reserved word in strict mode");
  }
};

// Parses await expression inside async function.

pp$3.parseAwait = function (node) {
  // istanbul ignore next: this condition is checked at the call site so won't be hit here
  if (!this.state.inAsync) {
    this.unexpected();
  }
  if (this.match(types.star)) {
    this.raise(node.start, "await* has been removed from the async functions proposal. Use Promise.all() instead.");
  }
  node.argument = this.parseMaybeUnary();
  return this.finishNode(node, "AwaitExpression");
};

// Parses yield expression inside generator.

pp$3.parseYield = function () {
  var node = this.startNode();
  this.next();
  if (this.match(types.semi) || this.canInsertSemicolon() || !this.match(types.star) && !this.state.type.startsExpr) {
    node.delegate = false;
    node.argument = null;
  } else {
    node.delegate = this.eat(types.star);
    node.argument = this.parseMaybeAssign();
  }
  return this.finishNode(node, "YieldExpression");
};

// Start an AST node, attaching a start offset.

var pp$4 = Parser.prototype;
var commentKeys = ["leadingComments", "trailingComments", "innerComments"];

var Node = function () {
  function Node(pos, loc, filename) {
    classCallCheck(this, Node);

    this.type = "";
    this.start = pos;
    this.end = 0;
    this.loc = new SourceLocation(loc);
    if (filename) this.loc.filename = filename;
  }

  Node.prototype.__clone = function __clone() {
    var node2 = new Node();
    for (var key in this) {
      // Do not clone comments that are already attached to the node
      if (commentKeys.indexOf(key) < 0) {
        node2[key] = this[key];
      }
    }

    return node2;
  };

  return Node;
}();

pp$4.startNode = function () {
  return new Node(this.state.start, this.state.startLoc, this.filename);
};

pp$4.startNodeAt = function (pos, loc) {
  return new Node(pos, loc, this.filename);
};

function finishNodeAt(node, type, pos, loc) {
  node.type = type;
  node.end = pos;
  node.loc.end = loc;
  this.processComment(node);
  return node;
}

// Finish an AST node, adding `type` and `end` properties.

pp$4.finishNode = function (node, type) {
  return finishNodeAt.call(this, node, type, this.state.lastTokEnd, this.state.lastTokEndLoc);
};

// Finish node at given position

pp$4.finishNodeAt = function (node, type, pos, loc) {
  return finishNodeAt.call(this, node, type, pos, loc);
};

var pp$5 = Parser.prototype;

// This function is used to raise exceptions on parse errors. It
// takes an offset integer (into the current `input`) to indicate
// the location of the error, attaches the position to the end
// of the error message, and then raises a `SyntaxError` with that
// message.

pp$5.raise = function (pos, message) {
  var loc = getLineInfo(this.input, pos);
  message += " (" + loc.line + ":" + loc.column + ")";
  var err = new SyntaxError(message);
  err.pos = pos;
  err.loc = loc;
  throw err;
};

/* eslint max-len: 0 */

/**
 * Based on the comment attachment algorithm used in espree and estraverse.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

function last(stack) {
  return stack[stack.length - 1];
}

var pp$6 = Parser.prototype;

pp$6.addComment = function (comment) {
  if (this.filename) comment.loc.filename = this.filename;
  this.state.trailingComments.push(comment);
  this.state.leadingComments.push(comment);
};

pp$6.processComment = function (node) {
  if (node.type === "Program" && node.body.length > 0) return;

  var stack = this.state.commentStack;

  var firstChild = void 0,
      lastChild = void 0,
      trailingComments = void 0,
      i = void 0,
      j = void 0;

  if (this.state.trailingComments.length > 0) {
    // If the first comment in trailingComments comes after the
    // current node, then we're good - all comments in the array will
    // come after the node and so it's safe to add them as official
    // trailingComments.
    if (this.state.trailingComments[0].start >= node.end) {
      trailingComments = this.state.trailingComments;
      this.state.trailingComments = [];
    } else {
      // Otherwise, if the first comment doesn't come after the
      // current node, that means we have a mix of leading and trailing
      // comments in the array and that leadingComments contains the
      // same items as trailingComments. Reset trailingComments to
      // zero items and we'll handle this by evaluating leadingComments
      // later.
      this.state.trailingComments.length = 0;
    }
  } else {
    var lastInStack = last(stack);
    if (stack.length > 0 && lastInStack.trailingComments && lastInStack.trailingComments[0].start >= node.end) {
      trailingComments = lastInStack.trailingComments;
      lastInStack.trailingComments = null;
    }
  }

  // Eating the stack.
  if (stack.length > 0 && last(stack).start >= node.start) {
    firstChild = stack.pop();
  }

  while (stack.length > 0 && last(stack).start >= node.start) {
    lastChild = stack.pop();
  }

  if (!lastChild && firstChild) lastChild = firstChild;

  // Attach comments that follow a trailing comma on the last
  // property in an object literal or a trailing comma in function arguments
  // as trailing comments
  if (firstChild && this.state.leadingComments.length > 0) {
    var lastComment = last(this.state.leadingComments);

    if (firstChild.type === "ObjectProperty") {
      if (lastComment.start >= node.start) {
        if (this.state.commentPreviousNode) {
          for (j = 0; j < this.state.leadingComments.length; j++) {
            if (this.state.leadingComments[j].end < this.state.commentPreviousNode.end) {
              this.state.leadingComments.splice(j, 1);
              j--;
            }
          }

          if (this.state.leadingComments.length > 0) {
            firstChild.trailingComments = this.state.leadingComments;
            this.state.leadingComments = [];
          }
        }
      }
    } else if (node.type === "CallExpression" && node.arguments && node.arguments.length) {
      var lastArg = last(node.arguments);

      if (lastArg && lastComment.start >= lastArg.start && lastComment.end <= node.end) {
        if (this.state.commentPreviousNode) {
          if (this.state.leadingComments.length > 0) {
            lastArg.trailingComments = this.state.leadingComments;
            this.state.leadingComments = [];
          }
        }
      }
    }
  }

  if (lastChild) {
    if (lastChild.leadingComments) {
      if (lastChild !== node && last(lastChild.leadingComments).end <= node.start) {
        node.leadingComments = lastChild.leadingComments;
        lastChild.leadingComments = null;
      } else {
        // A leading comment for an anonymous class had been stolen by its first ClassMethod,
        // so this takes back the leading comment.
        // See also: https://github.com/eslint/espree/issues/158
        for (i = lastChild.leadingComments.length - 2; i >= 0; --i) {
          if (lastChild.leadingComments[i].end <= node.start) {
            node.leadingComments = lastChild.leadingComments.splice(0, i + 1);
            break;
          }
        }
      }
    }
  } else if (this.state.leadingComments.length > 0) {
    if (last(this.state.leadingComments).end <= node.start) {
      if (this.state.commentPreviousNode) {
        for (j = 0; j < this.state.leadingComments.length; j++) {
          if (this.state.leadingComments[j].end < this.state.commentPreviousNode.end) {
            this.state.leadingComments.splice(j, 1);
            j--;
          }
        }
      }
      if (this.state.leadingComments.length > 0) {
        node.leadingComments = this.state.leadingComments;
        this.state.leadingComments = [];
      }
    } else {
      // https://github.com/eslint/espree/issues/2
      //
      // In special cases, such as return (without a value) and
      // debugger, all comments will end up as leadingComments and
      // will otherwise be eliminated. This step runs when the
      // commentStack is empty and there are comments left
      // in leadingComments.
      //
      // This loop figures out the stopping point between the actual
      // leading and trailing comments by finding the location of the
      // first comment that comes after the given node.
      for (i = 0; i < this.state.leadingComments.length; i++) {
        if (this.state.leadingComments[i].end > node.start) {
          break;
        }
      }

      // Split the array based on the location of the first comment
      // that comes after the node. Keep in mind that this could
      // result in an empty array, and if so, the array must be
      // deleted.
      node.leadingComments = this.state.leadingComments.slice(0, i);
      if (node.leadingComments.length === 0) {
        node.leadingComments = null;
      }

      // Similarly, trailing comments are attached later. The variable
      // must be reset to null if there are no trailing comments.
      trailingComments = this.state.leadingComments.slice(i);
      if (trailingComments.length === 0) {
        trailingComments = null;
      }
    }
  }

  this.state.commentPreviousNode = node;

  if (trailingComments) {
    if (trailingComments.length && trailingComments[0].start >= node.start && last(trailingComments).end <= node.end) {
      node.innerComments = trailingComments;
    } else {
      node.trailingComments = trailingComments;
    }
  }

  stack.push(node);
};

var pp$7 = Parser.prototype;

pp$7.estreeParseRegExpLiteral = function (_ref) {
  var pattern = _ref.pattern,
      flags = _ref.flags;

  var regex = null;
  try {
    regex = new RegExp(pattern, flags);
  } catch (e) {
    // In environments that don't support these flags value will
    // be null as the regex can't be represented natively.
  }
  var node = this.estreeParseLiteral(regex);
  node.regex = { pattern: pattern, flags: flags };

  return node;
};

pp$7.estreeParseLiteral = function (value) {
  return this.parseLiteral(value, "Literal");
};

pp$7.directiveToStmt = function (directive) {
  var directiveLiteral = directive.value;

  var stmt = this.startNodeAt(directive.start, directive.loc.start);
  var expression = this.startNodeAt(directiveLiteral.start, directiveLiteral.loc.start);

  expression.value = directiveLiteral.value;
  expression.raw = directiveLiteral.extra.raw;

  stmt.expression = this.finishNodeAt(expression, "Literal", directiveLiteral.end, directiveLiteral.loc.end);
  stmt.directive = directiveLiteral.extra.raw.slice(1, -1);

  return this.finishNodeAt(stmt, "ExpressionStatement", directive.end, directive.loc.end);
};

function isSimpleProperty(node) {
  return node && node.type === "Property" && node.kind === "init" && node.method === false;
}

var estreePlugin = function (instance) {
  instance.extend("checkDeclaration", function (inner) {
    return function (node) {
      if (isSimpleProperty(node)) {
        this.checkDeclaration(node.value);
      } else {
        inner.call(this, node);
      }
    };
  });

  instance.extend("checkGetterSetterParamCount", function () {
    return function (prop) {
      var paramCount = prop.kind === "get" ? 0 : 1;
      if (prop.value.params.length !== paramCount) {
        var start = prop.start;
        if (prop.kind === "get") {
          this.raise(start, "getter should have no params");
        } else {
          this.raise(start, "setter should have exactly one param");
        }
      }
    };
  });

  instance.extend("checkLVal", function (inner) {
    return function (expr, isBinding, checkClashes) {
      var _this = this;

      switch (expr.type) {
        case "ObjectPattern":
          expr.properties.forEach(function (prop) {
            _this.checkLVal(prop.type === "Property" ? prop.value : prop, isBinding, checkClashes, "object destructuring pattern");
          });
          break;
        default:
          for (var _len = arguments.length, args = Array(_len > 3 ? _len - 3 : 0), _key = 3; _key < _len; _key++) {
            args[_key - 3] = arguments[_key];
          }

          inner.call.apply(inner, [this, expr, isBinding, checkClashes].concat(args));
      }
    };
  });

  instance.extend("checkPropClash", function () {
    return function (prop, propHash) {
      if (prop.computed || !isSimpleProperty(prop)) return;

      var key = prop.key;
      // It is either an Identifier or a String/NumericLiteral
      var name = key.type === "Identifier" ? key.name : String(key.value);

      if (name === "__proto__") {
        if (propHash.proto) this.raise(key.start, "Redefinition of __proto__ property");
        propHash.proto = true;
      }
    };
  });

  instance.extend("isStrictBody", function () {
    return function (node, isExpression) {
      if (!isExpression && node.body.body.length > 0) {
        for (var _iterator = node.body.body, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
          var _ref2;

          if (_isArray) {
            if (_i >= _iterator.length) break;
            _ref2 = _iterator[_i++];
          } else {
            _i = _iterator.next();
            if (_i.done) break;
            _ref2 = _i.value;
          }

          var directive = _ref2;

          if (directive.type === "ExpressionStatement" && directive.expression.type === "Literal") {
            if (directive.expression.value === "use strict") return true;
          } else {
            // Break for the first non literal expression
            break;
          }
        }
      }

      return false;
    };
  });

  instance.extend("isValidDirective", function () {
    return function (stmt) {
      return stmt.type === "ExpressionStatement" && stmt.expression.type === "Literal" && typeof stmt.expression.value === "string" && (!stmt.expression.extra || !stmt.expression.extra.parenthesized);
    };
  });

  instance.extend("stmtToDirective", function (inner) {
    return function (stmt) {
      var directive = inner.call(this, stmt);
      var value = stmt.expression.value;

      // Reset value to the actual value as in estree mode we want
      // the stmt to have the real value and not the raw value
      directive.value.value = value;

      return directive;
    };
  });

  instance.extend("parseBlockBody", function (inner) {
    return function (node) {
      var _this2 = this;

      for (var _len2 = arguments.length, args = Array(_len2 > 1 ? _len2 - 1 : 0), _key2 = 1; _key2 < _len2; _key2++) {
        args[_key2 - 1] = arguments[_key2];
      }

      inner.call.apply(inner, [this, node].concat(args));

      node.directives.reverse().forEach(function (directive) {
        node.body.unshift(_this2.directiveToStmt(directive));
      });
      delete node.directives;
    };
  });

  instance.extend("parseClassMethod", function () {
    return function (classBody, method, isGenerator, isAsync) {
      this.parseMethod(method, isGenerator, isAsync);
      if (method.typeParameters) {
        method.value.typeParameters = method.typeParameters;
        delete method.typeParameters;
      }
      classBody.body.push(this.finishNode(method, "MethodDefinition"));
    };
  });

  instance.extend("parseExprAtom", function (inner) {
    return function () {
      switch (this.state.type) {
        case types.regexp:
          return this.estreeParseRegExpLiteral(this.state.value);

        case types.num:
        case types.string:
          return this.estreeParseLiteral(this.state.value);

        case types._null:
          return this.estreeParseLiteral(null);

        case types._true:
          return this.estreeParseLiteral(true);

        case types._false:
          return this.estreeParseLiteral(false);

        default:
          for (var _len3 = arguments.length, args = Array(_len3), _key3 = 0; _key3 < _len3; _key3++) {
            args[_key3] = arguments[_key3];
          }

          return inner.call.apply(inner, [this].concat(args));
      }
    };
  });

  instance.extend("parseLiteral", function (inner) {
    return function () {
      for (var _len4 = arguments.length, args = Array(_len4), _key4 = 0; _key4 < _len4; _key4++) {
        args[_key4] = arguments[_key4];
      }

      var node = inner.call.apply(inner, [this].concat(args));
      node.raw = node.extra.raw;
      delete node.extra;

      return node;
    };
  });

  instance.extend("parseMethod", function (inner) {
    return function (node) {
      var funcNode = this.startNode();
      funcNode.kind = node.kind; // provide kind, so inner method correctly sets state

      for (var _len5 = arguments.length, args = Array(_len5 > 1 ? _len5 - 1 : 0), _key5 = 1; _key5 < _len5; _key5++) {
        args[_key5 - 1] = arguments[_key5];
      }

      funcNode = inner.call.apply(inner, [this, funcNode].concat(args));
      delete funcNode.kind;
      node.value = this.finishNode(funcNode, "FunctionExpression");

      return node;
    };
  });

  instance.extend("parseObjectMethod", function (inner) {
    return function () {
      for (var _len6 = arguments.length, args = Array(_len6), _key6 = 0; _key6 < _len6; _key6++) {
        args[_key6] = arguments[_key6];
      }

      var node = inner.call.apply(inner, [this].concat(args));

      if (node) {
        if (node.kind === "method") node.kind = "init";
        node.type = "Property";
      }

      return node;
    };
  });

  instance.extend("parseObjectProperty", function (inner) {
    return function () {
      for (var _len7 = arguments.length, args = Array(_len7), _key7 = 0; _key7 < _len7; _key7++) {
        args[_key7] = arguments[_key7];
      }

      var node = inner.call.apply(inner, [this].concat(args));

      if (node) {
        node.kind = "init";
        node.type = "Property";
      }

      return node;
    };
  });

  instance.extend("toAssignable", function (inner) {
    return function (node, isBinding) {
      for (var _len8 = arguments.length, args = Array(_len8 > 2 ? _len8 - 2 : 0), _key8 = 2; _key8 < _len8; _key8++) {
        args[_key8 - 2] = arguments[_key8];
      }

      if (isSimpleProperty(node)) {
        this.toAssignable.apply(this, [node.value, isBinding].concat(args));

        return node;
      } else if (node.type === "ObjectExpression") {
        node.type = "ObjectPattern";
        for (var _iterator2 = node.properties, _isArray2 = Array.isArray(_iterator2), _i2 = 0, _iterator2 = _isArray2 ? _iterator2 : _iterator2[Symbol.iterator]();;) {
          var _ref3;

          if (_isArray2) {
            if (_i2 >= _iterator2.length) break;
            _ref3 = _iterator2[_i2++];
          } else {
            _i2 = _iterator2.next();
            if (_i2.done) break;
            _ref3 = _i2.value;
          }

          var prop = _ref3;

          if (prop.kind === "get" || prop.kind === "set") {
            this.raise(prop.key.start, "Object pattern can't contain getter or setter");
          } else if (prop.method) {
            this.raise(prop.key.start, "Object pattern can't contain methods");
          } else {
            this.toAssignable(prop, isBinding, "object destructuring pattern");
          }
        }

        return node;
      }

      return inner.call.apply(inner, [this, node, isBinding].concat(args));
    };
  });
};

/* eslint max-len: 0 */

var primitiveTypes = ["any", "mixed", "empty", "bool", "boolean", "number", "string", "void", "null"];

var pp$8 = Parser.prototype;

pp$8.flowParseTypeInitialiser = function (tok) {
  var oldInType = this.state.inType;
  this.state.inType = true;
  this.expect(tok || types.colon);

  var type = this.flowParseType();
  this.state.inType = oldInType;
  return type;
};

pp$8.flowParsePredicate = function () {
  var node = this.startNode();
  var moduloLoc = this.state.startLoc;
  var moduloPos = this.state.start;
  this.expect(types.modulo);
  var checksLoc = this.state.startLoc;
  this.expectContextual("checks");
  // Force '%' and 'checks' to be adjacent
  if (moduloLoc.line !== checksLoc.line || moduloLoc.column !== checksLoc.column - 1) {
    this.raise(moduloPos, "Spaces between ´%´ and ´checks´ are not allowed here.");
  }
  if (this.eat(types.parenL)) {
    node.expression = this.parseExpression();
    this.expect(types.parenR);
    return this.finishNode(node, "DeclaredPredicate");
  } else {
    return this.finishNode(node, "InferredPredicate");
  }
};

pp$8.flowParseTypeAndPredicateInitialiser = function () {
  var oldInType = this.state.inType;
  this.state.inType = true;
  this.expect(types.colon);
  var type = null;
  var predicate = null;
  if (this.match(types.modulo)) {
    this.state.inType = oldInType;
    predicate = this.flowParsePredicate();
  } else {
    type = this.flowParseType();
    this.state.inType = oldInType;
    if (this.match(types.modulo)) {
      predicate = this.flowParsePredicate();
    }
  }
  return [type, predicate];
};

pp$8.flowParseDeclareClass = function (node) {
  this.next();
  this.flowParseInterfaceish(node, true);
  return this.finishNode(node, "DeclareClass");
};

pp$8.flowParseDeclareFunction = function (node) {
  this.next();

  var id = node.id = this.parseIdentifier();

  var typeNode = this.startNode();
  var typeContainer = this.startNode();

  if (this.isRelational("<")) {
    typeNode.typeParameters = this.flowParseTypeParameterDeclaration();
  } else {
    typeNode.typeParameters = null;
  }

  this.expect(types.parenL);
  var tmp = this.flowParseFunctionTypeParams();
  typeNode.params = tmp.params;
  typeNode.rest = tmp.rest;
  this.expect(types.parenR);
  var predicate = null;

  var _flowParseTypeAndPred = this.flowParseTypeAndPredicateInitialiser();

  typeNode.returnType = _flowParseTypeAndPred[0];
  predicate = _flowParseTypeAndPred[1];

  typeContainer.typeAnnotation = this.finishNode(typeNode, "FunctionTypeAnnotation");
  typeContainer.predicate = predicate;
  id.typeAnnotation = this.finishNode(typeContainer, "TypeAnnotation");

  this.finishNode(id, id.type);

  this.semicolon();

  return this.finishNode(node, "DeclareFunction");
};

pp$8.flowParseDeclare = function (node) {
  if (this.match(types._class)) {
    return this.flowParseDeclareClass(node);
  } else if (this.match(types._function)) {
    return this.flowParseDeclareFunction(node);
  } else if (this.match(types._var)) {
    return this.flowParseDeclareVariable(node);
  } else if (this.isContextual("module")) {
    if (this.lookahead().type === types.dot) {
      return this.flowParseDeclareModuleExports(node);
    } else {
      return this.flowParseDeclareModule(node);
    }
  } else if (this.isContextual("type")) {
    return this.flowParseDeclareTypeAlias(node);
  } else if (this.isContextual("opaque")) {
    return this.flowParseDeclareOpaqueType(node);
  } else if (this.isContextual("interface")) {
    return this.flowParseDeclareInterface(node);
  } else if (this.match(types._export)) {
    return this.flowParseDeclareExportDeclaration(node);
  } else {
    this.unexpected();
  }
};

pp$8.flowParseDeclareExportDeclaration = function (node) {
  this.expect(types._export);
  if (this.isContextual("opaque") // declare export opaque ...
  ) {
      node.declaration = this.flowParseDeclare(this.startNode());
      node.default = false;

      return this.finishNode(node, "DeclareExportDeclaration");
    }

  throw this.unexpected();
};

pp$8.flowParseDeclareVariable = function (node) {
  this.next();
  node.id = this.flowParseTypeAnnotatableIdentifier();
  this.semicolon();
  return this.finishNode(node, "DeclareVariable");
};

pp$8.flowParseDeclareModule = function (node) {
  this.next();

  if (this.match(types.string)) {
    node.id = this.parseExprAtom();
  } else {
    node.id = this.parseIdentifier();
  }

  var bodyNode = node.body = this.startNode();
  var body = bodyNode.body = [];
  this.expect(types.braceL);
  while (!this.match(types.braceR)) {
    var _bodyNode = this.startNode();

    if (this.match(types._import)) {
      var lookahead = this.lookahead();
      if (lookahead.value !== "type" && lookahead.value !== "typeof") {
        this.unexpected(null, "Imports within a `declare module` body must always be `import type` or `import typeof`");
      }

      this.parseImport(_bodyNode);
    } else {
      this.expectContextual("declare", "Only declares and type imports are allowed inside declare module");

      _bodyNode = this.flowParseDeclare(_bodyNode, true);
    }

    body.push(_bodyNode);
  }
  this.expect(types.braceR);

  this.finishNode(bodyNode, "BlockStatement");
  return this.finishNode(node, "DeclareModule");
};

pp$8.flowParseDeclareModuleExports = function (node) {
  this.expectContextual("module");
  this.expect(types.dot);
  this.expectContextual("exports");
  node.typeAnnotation = this.flowParseTypeAnnotation();
  this.semicolon();

  return this.finishNode(node, "DeclareModuleExports");
};

pp$8.flowParseDeclareTypeAlias = function (node) {
  this.next();
  this.flowParseTypeAlias(node);
  return this.finishNode(node, "DeclareTypeAlias");
};

pp$8.flowParseDeclareOpaqueType = function (node) {
  this.next();
  this.flowParseOpaqueType(node, true);
  return this.finishNode(node, "DeclareOpaqueType");
};

pp$8.flowParseDeclareInterface = function (node) {
  this.next();
  this.flowParseInterfaceish(node);
  return this.finishNode(node, "DeclareInterface");
};

// Interfaces

pp$8.flowParseInterfaceish = function (node) {
  node.id = this.parseIdentifier();

  if (this.isRelational("<")) {
    node.typeParameters = this.flowParseTypeParameterDeclaration();
  } else {
    node.typeParameters = null;
  }

  node.extends = [];
  node.mixins = [];

  if (this.eat(types._extends)) {
    do {
      node.extends.push(this.flowParseInterfaceExtends());
    } while (this.eat(types.comma));
  }

  if (this.isContextual("mixins")) {
    this.next();
    do {
      node.mixins.push(this.flowParseInterfaceExtends());
    } while (this.eat(types.comma));
  }

  node.body = this.flowParseObjectType(true, false, false);
};

pp$8.flowParseInterfaceExtends = function () {
  var node = this.startNode();

  node.id = this.flowParseQualifiedTypeIdentifier();
  if (this.isRelational("<")) {
    node.typeParameters = this.flowParseTypeParameterInstantiation();
  } else {
    node.typeParameters = null;
  }

  return this.finishNode(node, "InterfaceExtends");
};

pp$8.flowParseInterface = function (node) {
  this.flowParseInterfaceish(node, false);
  return this.finishNode(node, "InterfaceDeclaration");
};

pp$8.flowParseRestrictedIdentifier = function (liberal) {
  if (primitiveTypes.indexOf(this.state.value) > -1) {
    this.raise(this.state.start, "Cannot overwrite primitive type " + this.state.value);
  }

  return this.parseIdentifier(liberal);
};

// Type aliases

pp$8.flowParseTypeAlias = function (node) {
  node.id = this.flowParseRestrictedIdentifier();

  if (this.isRelational("<")) {
    node.typeParameters = this.flowParseTypeParameterDeclaration();
  } else {
    node.typeParameters = null;
  }

  node.right = this.flowParseTypeInitialiser(types.eq);
  this.semicolon();

  return this.finishNode(node, "TypeAlias");
};

// Opaque type aliases

pp$8.flowParseOpaqueType = function (node, declare) {
  this.expectContextual("type");
  node.id = this.flowParseRestrictedIdentifier();

  if (this.isRelational("<")) {
    node.typeParameters = this.flowParseTypeParameterDeclaration();
  } else {
    node.typeParameters = null;
  }

  // Parse the supertype
  node.supertype = null;
  if (this.match(types.colon)) {
    node.supertype = this.flowParseTypeInitialiser(types.colon);
  }

  node.impltype = null;
  if (!declare) {
    node.impltype = this.flowParseTypeInitialiser(types.eq);
  }
  this.semicolon();

  return this.finishNode(node, "OpaqueType");
};

// Type annotations

pp$8.flowParseTypeParameter = function () {
  var node = this.startNode();

  var variance = this.flowParseVariance();

  var ident = this.flowParseTypeAnnotatableIdentifier();
  node.name = ident.name;
  node.variance = variance;
  node.bound = ident.typeAnnotation;

  if (this.match(types.eq)) {
    this.eat(types.eq);
    node.default = this.flowParseType();
  }

  return this.finishNode(node, "TypeParameter");
};

pp$8.flowParseTypeParameterDeclaration = function () {
  var oldInType = this.state.inType;
  var node = this.startNode();
  node.params = [];

  this.state.inType = true;

  // istanbul ignore else: this condition is already checked at all call sites
  if (this.isRelational("<") || this.match(types.jsxTagStart)) {
    this.next();
  } else {
    this.unexpected();
  }

  do {
    node.params.push(this.flowParseTypeParameter());
    if (!this.isRelational(">")) {
      this.expect(types.comma);
    }
  } while (!this.isRelational(">"));
  this.expectRelational(">");

  this.state.inType = oldInType;

  return this.finishNode(node, "TypeParameterDeclaration");
};

pp$8.flowParseTypeParameterInstantiation = function () {
  var node = this.startNode();
  var oldInType = this.state.inType;
  node.params = [];

  this.state.inType = true;

  this.expectRelational("<");
  while (!this.isRelational(">")) {
    node.params.push(this.flowParseType());
    if (!this.isRelational(">")) {
      this.expect(types.comma);
    }
  }
  this.expectRelational(">");

  this.state.inType = oldInType;

  return this.finishNode(node, "TypeParameterInstantiation");
};

pp$8.flowParseObjectPropertyKey = function () {
  return this.match(types.num) || this.match(types.string) ? this.parseExprAtom() : this.parseIdentifier(true);
};

pp$8.flowParseObjectTypeIndexer = function (node, isStatic, variance) {
  node.static = isStatic;

  this.expect(types.bracketL);
  if (this.lookahead().type === types.colon) {
    node.id = this.flowParseObjectPropertyKey();
    node.key = this.flowParseTypeInitialiser();
  } else {
    node.id = null;
    node.key = this.flowParseType();
  }
  this.expect(types.bracketR);
  node.value = this.flowParseTypeInitialiser();
  node.variance = variance;

  this.flowObjectTypeSemicolon();
  return this.finishNode(node, "ObjectTypeIndexer");
};

pp$8.flowParseObjectTypeMethodish = function (node) {
  node.params = [];
  node.rest = null;
  node.typeParameters = null;

  if (this.isRelational("<")) {
    node.typeParameters = this.flowParseTypeParameterDeclaration();
  }

  this.expect(types.parenL);
  while (!this.match(types.parenR) && !this.match(types.ellipsis)) {
    node.params.push(this.flowParseFunctionTypeParam());
    if (!this.match(types.parenR)) {
      this.expect(types.comma);
    }
  }

  if (this.eat(types.ellipsis)) {
    node.rest = this.flowParseFunctionTypeParam();
  }
  this.expect(types.parenR);
  node.returnType = this.flowParseTypeInitialiser();

  return this.finishNode(node, "FunctionTypeAnnotation");
};

pp$8.flowParseObjectTypeMethod = function (startPos, startLoc, isStatic, key) {
  var node = this.startNodeAt(startPos, startLoc);
  node.value = this.flowParseObjectTypeMethodish(this.startNodeAt(startPos, startLoc));
  node.static = isStatic;
  node.key = key;
  node.optional = false;
  this.flowObjectTypeSemicolon();
  return this.finishNode(node, "ObjectTypeProperty");
};

pp$8.flowParseObjectTypeCallProperty = function (node, isStatic) {
  var valueNode = this.startNode();
  node.static = isStatic;
  node.value = this.flowParseObjectTypeMethodish(valueNode);
  this.flowObjectTypeSemicolon();
  return this.finishNode(node, "ObjectTypeCallProperty");
};

pp$8.flowParseObjectType = function (allowStatic, allowExact, allowSpread) {
  var oldInType = this.state.inType;
  this.state.inType = true;

  var nodeStart = this.startNode();
  var node = void 0;
  var propertyKey = void 0;
  var isStatic = false;

  nodeStart.callProperties = [];
  nodeStart.properties = [];
  nodeStart.indexers = [];

  var endDelim = void 0;
  var exact = void 0;
  if (allowExact && this.match(types.braceBarL)) {
    this.expect(types.braceBarL);
    endDelim = types.braceBarR;
    exact = true;
  } else {
    this.expect(types.braceL);
    endDelim = types.braceR;
    exact = false;
  }

  nodeStart.exact = exact;

  while (!this.match(endDelim)) {
    var optional = false;
    var startPos = this.state.start;
    var startLoc = this.state.startLoc;
    node = this.startNode();
    if (allowStatic && this.isContextual("static") && this.lookahead().type !== types.colon) {
      this.next();
      isStatic = true;
    }

    var variancePos = this.state.start;
    var variance = this.flowParseVariance();

    if (this.match(types.bracketL)) {
      nodeStart.indexers.push(this.flowParseObjectTypeIndexer(node, isStatic, variance));
    } else if (this.match(types.parenL) || this.isRelational("<")) {
      if (variance) {
        this.unexpected(variancePos);
      }
      nodeStart.callProperties.push(this.flowParseObjectTypeCallProperty(node, isStatic));
    } else {
      if (this.match(types.ellipsis)) {
        if (!allowSpread) {
          this.unexpected(null, "Spread operator cannot appear in class or interface definitions");
        }
        if (variance) {
          this.unexpected(variance.start, "Spread properties cannot have variance");
        }
        this.expect(types.ellipsis);
        node.argument = this.flowParseType();
        this.flowObjectTypeSemicolon();
        nodeStart.properties.push(this.finishNode(node, "ObjectTypeSpreadProperty"));
      } else {
        propertyKey = this.flowParseObjectPropertyKey();
        if (this.isRelational("<") || this.match(types.parenL)) {
          // This is a method property
          if (variance) {
            this.unexpected(variance.start);
          }
          nodeStart.properties.push(this.flowParseObjectTypeMethod(startPos, startLoc, isStatic, propertyKey));
        } else {
          if (this.eat(types.question)) {
            optional = true;
          }
          node.key = propertyKey;
          node.value = this.flowParseTypeInitialiser();
          node.optional = optional;
          node.static = isStatic;
          node.variance = variance;
          this.flowObjectTypeSemicolon();
          nodeStart.properties.push(this.finishNode(node, "ObjectTypeProperty"));
        }
      }
    }

    isStatic = false;
  }

  this.expect(endDelim);

  var out = this.finishNode(nodeStart, "ObjectTypeAnnotation");

  this.state.inType = oldInType;

  return out;
};

pp$8.flowObjectTypeSemicolon = function () {
  if (!this.eat(types.semi) && !this.eat(types.comma) && !this.match(types.braceR) && !this.match(types.braceBarR)) {
    this.unexpected();
  }
};

pp$8.flowParseQualifiedTypeIdentifier = function (startPos, startLoc, id) {
  startPos = startPos || this.state.start;
  startLoc = startLoc || this.state.startLoc;
  var node = id || this.parseIdentifier();

  while (this.eat(types.dot)) {
    var node2 = this.startNodeAt(startPos, startLoc);
    node2.qualification = node;
    node2.id = this.parseIdentifier();
    node = this.finishNode(node2, "QualifiedTypeIdentifier");
  }

  return node;
};

pp$8.flowParseGenericType = function (startPos, startLoc, id) {
  var node = this.startNodeAt(startPos, startLoc);

  node.typeParameters = null;
  node.id = this.flowParseQualifiedTypeIdentifier(startPos, startLoc, id);

  if (this.isRelational("<")) {
    node.typeParameters = this.flowParseTypeParameterInstantiation();
  }

  return this.finishNode(node, "GenericTypeAnnotation");
};

pp$8.flowParseTypeofType = function () {
  var node = this.startNode();
  this.expect(types._typeof);
  node.argument = this.flowParsePrimaryType();
  return this.finishNode(node, "TypeofTypeAnnotation");
};

pp$8.flowParseTupleType = function () {
  var node = this.startNode();
  node.types = [];
  this.expect(types.bracketL);
  // We allow trailing commas
  while (this.state.pos < this.input.length && !this.match(types.bracketR)) {
    node.types.push(this.flowParseType());
    if (this.match(types.bracketR)) break;
    this.expect(types.comma);
  }
  this.expect(types.bracketR);
  return this.finishNode(node, "TupleTypeAnnotation");
};

pp$8.flowParseFunctionTypeParam = function () {
  var name = null;
  var optional = false;
  var typeAnnotation = null;
  var node = this.startNode();
  var lh = this.lookahead();
  if (lh.type === types.colon || lh.type === types.question) {
    name = this.parseIdentifier();
    if (this.eat(types.question)) {
      optional = true;
    }
    typeAnnotation = this.flowParseTypeInitialiser();
  } else {
    typeAnnotation = this.flowParseType();
  }
  node.name = name;
  node.optional = optional;
  node.typeAnnotation = typeAnnotation;
  return this.finishNode(node, "FunctionTypeParam");
};

pp$8.reinterpretTypeAsFunctionTypeParam = function (type) {
  var node = this.startNodeAt(type.start, type.loc.start);
  node.name = null;
  node.optional = false;
  node.typeAnnotation = type;
  return this.finishNode(node, "FunctionTypeParam");
};

pp$8.flowParseFunctionTypeParams = function () {
  var params = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [];

  var ret = { params: params, rest: null };
  while (!this.match(types.parenR) && !this.match(types.ellipsis)) {
    ret.params.push(this.flowParseFunctionTypeParam());
    if (!this.match(types.parenR)) {
      this.expect(types.comma);
    }
  }
  if (this.eat(types.ellipsis)) {
    ret.rest = this.flowParseFunctionTypeParam();
  }
  return ret;
};

pp$8.flowIdentToTypeAnnotation = function (startPos, startLoc, node, id) {
  switch (id.name) {
    case "any":
      return this.finishNode(node, "AnyTypeAnnotation");

    case "void":
      return this.finishNode(node, "VoidTypeAnnotation");

    case "bool":
    case "boolean":
      return this.finishNode(node, "BooleanTypeAnnotation");

    case "mixed":
      return this.finishNode(node, "MixedTypeAnnotation");

    case "empty":
      return this.finishNode(node, "EmptyTypeAnnotation");

    case "number":
      return this.finishNode(node, "NumberTypeAnnotation");

    case "string":
      return this.finishNode(node, "StringTypeAnnotation");

    default:
      return this.flowParseGenericType(startPos, startLoc, id);
  }
};

// The parsing of types roughly parallels the parsing of expressions, and
// primary types are kind of like primary expressions...they're the
// primitives with which other types are constructed.
pp$8.flowParsePrimaryType = function () {
  var startPos = this.state.start;
  var startLoc = this.state.startLoc;
  var node = this.startNode();
  var tmp = void 0;
  var type = void 0;
  var isGroupedType = false;
  var oldNoAnonFunctionType = this.state.noAnonFunctionType;

  switch (this.state.type) {
    case types.name:
      return this.flowIdentToTypeAnnotation(startPos, startLoc, node, this.parseIdentifier());

    case types.braceL:
      return this.flowParseObjectType(false, false, true);

    case types.braceBarL:
      return this.flowParseObjectType(false, true, true);

    case types.bracketL:
      return this.flowParseTupleType();

    case types.relational:
      if (this.state.value === "<") {
        node.typeParameters = this.flowParseTypeParameterDeclaration();
        this.expect(types.parenL);
        tmp = this.flowParseFunctionTypeParams();
        node.params = tmp.params;
        node.rest = tmp.rest;
        this.expect(types.parenR);

        this.expect(types.arrow);

        node.returnType = this.flowParseType();

        return this.finishNode(node, "FunctionTypeAnnotation");
      }
      break;

    case types.parenL:
      this.next();

      // Check to see if this is actually a grouped type
      if (!this.match(types.parenR) && !this.match(types.ellipsis)) {
        if (this.match(types.name)) {
          var token = this.lookahead().type;
          isGroupedType = token !== types.question && token !== types.colon;
        } else {
          isGroupedType = true;
        }
      }

      if (isGroupedType) {
        this.state.noAnonFunctionType = false;
        type = this.flowParseType();
        this.state.noAnonFunctionType = oldNoAnonFunctionType;

        // A `,` or a `) =>` means this is an anonymous function type
        if (this.state.noAnonFunctionType || !(this.match(types.comma) || this.match(types.parenR) && this.lookahead().type === types.arrow)) {
          this.expect(types.parenR);
          return type;
        } else {
          // Eat a comma if there is one
          this.eat(types.comma);
        }
      }

      if (type) {
        tmp = this.flowParseFunctionTypeParams([this.reinterpretTypeAsFunctionTypeParam(type)]);
      } else {
        tmp = this.flowParseFunctionTypeParams();
      }

      node.params = tmp.params;
      node.rest = tmp.rest;

      this.expect(types.parenR);

      this.expect(types.arrow);

      node.returnType = this.flowParseType();

      node.typeParameters = null;

      return this.finishNode(node, "FunctionTypeAnnotation");

    case types.string:
      return this.parseLiteral(this.state.value, "StringLiteralTypeAnnotation");

    case types._true:case types._false:
      node.value = this.match(types._true);
      this.next();
      return this.finishNode(node, "BooleanLiteralTypeAnnotation");

    case types.plusMin:
      if (this.state.value === "-") {
        this.next();
        if (!this.match(types.num)) this.unexpected(null, "Unexpected token, expected number");

        return this.parseLiteral(-this.state.value, "NumericLiteralTypeAnnotation", node.start, node.loc.start);
      }

      this.unexpected();
    case types.num:
      return this.parseLiteral(this.state.value, "NumericLiteralTypeAnnotation");

    case types._null:
      node.value = this.match(types._null);
      this.next();
      return this.finishNode(node, "NullLiteralTypeAnnotation");

    case types._this:
      node.value = this.match(types._this);
      this.next();
      return this.finishNode(node, "ThisTypeAnnotation");

    case types.star:
      this.next();
      return this.finishNode(node, "ExistentialTypeParam");

    default:
      if (this.state.type.keyword === "typeof") {
        return this.flowParseTypeofType();
      }
  }

  this.unexpected();
};

pp$8.flowParsePostfixType = function () {
  var startPos = this.state.start,
      startLoc = this.state.startLoc;
  var type = this.flowParsePrimaryType();
  while (!this.canInsertSemicolon() && this.match(types.bracketL)) {
    var node = this.startNodeAt(startPos, startLoc);
    node.elementType = type;
    this.expect(types.bracketL);
    this.expect(types.bracketR);
    type = this.finishNode(node, "ArrayTypeAnnotation");
  }
  return type;
};

pp$8.flowParsePrefixType = function () {
  var node = this.startNode();
  if (this.eat(types.question)) {
    node.typeAnnotation = this.flowParsePrefixType();
    return this.finishNode(node, "NullableTypeAnnotation");
  } else {
    return this.flowParsePostfixType();
  }
};

pp$8.flowParseAnonFunctionWithoutParens = function () {
  var param = this.flowParsePrefixType();
  if (!this.state.noAnonFunctionType && this.eat(types.arrow)) {
    var node = this.startNodeAt(param.start, param.loc.start);
    node.params = [this.reinterpretTypeAsFunctionTypeParam(param)];
    node.rest = null;
    node.returnType = this.flowParseType();
    node.typeParameters = null;
    return this.finishNode(node, "FunctionTypeAnnotation");
  }
  return param;
};

pp$8.flowParseIntersectionType = function () {
  var node = this.startNode();
  this.eat(types.bitwiseAND);
  var type = this.flowParseAnonFunctionWithoutParens();
  node.types = [type];
  while (this.eat(types.bitwiseAND)) {
    node.types.push(this.flowParseAnonFunctionWithoutParens());
  }
  return node.types.length === 1 ? type : this.finishNode(node, "IntersectionTypeAnnotation");
};

pp$8.flowParseUnionType = function () {
  var node = this.startNode();
  this.eat(types.bitwiseOR);
  var type = this.flowParseIntersectionType();
  node.types = [type];
  while (this.eat(types.bitwiseOR)) {
    node.types.push(this.flowParseIntersectionType());
  }
  return node.types.length === 1 ? type : this.finishNode(node, "UnionTypeAnnotation");
};

pp$8.flowParseType = function () {
  var oldInType = this.state.inType;
  this.state.inType = true;
  var type = this.flowParseUnionType();
  this.state.inType = oldInType;
  return type;
};

pp$8.flowParseTypeAnnotation = function () {
  var node = this.startNode();
  node.typeAnnotation = this.flowParseTypeInitialiser();
  return this.finishNode(node, "TypeAnnotation");
};

pp$8.flowParseTypeAndPredicateAnnotation = function () {
  var node = this.startNode();

  var _flowParseTypeAndPred2 = this.flowParseTypeAndPredicateInitialiser();

  node.typeAnnotation = _flowParseTypeAndPred2[0];
  node.predicate = _flowParseTypeAndPred2[1];

  return this.finishNode(node, "TypeAnnotation");
};

pp$8.flowParseTypeAnnotatableIdentifier = function () {
  var ident = this.flowParseRestrictedIdentifier();
  if (this.match(types.colon)) {
    ident.typeAnnotation = this.flowParseTypeAnnotation();
    this.finishNode(ident, ident.type);
  }
  return ident;
};

pp$8.typeCastToParameter = function (node) {
  node.expression.typeAnnotation = node.typeAnnotation;

  return this.finishNodeAt(node.expression, node.expression.type, node.typeAnnotation.end, node.typeAnnotation.loc.end);
};

pp$8.flowParseVariance = function () {
  var variance = null;
  if (this.match(types.plusMin)) {
    if (this.state.value === "+") {
      variance = "plus";
    } else if (this.state.value === "-") {
      variance = "minus";
    }
    this.next();
  }
  return variance;
};

var flowPlugin = function (instance) {
  // plain function return types: function name(): string {}
  instance.extend("parseFunctionBody", function (inner) {
    return function (node, allowExpression) {
      if (this.match(types.colon) && !allowExpression) {
        // if allowExpression is true then we're parsing an arrow function and if
        // there's a return type then it's been handled elsewhere
        node.returnType = this.flowParseTypeAndPredicateAnnotation();
      }

      return inner.call(this, node, allowExpression);
    };
  });

  // interfaces
  instance.extend("parseStatement", function (inner) {
    return function (declaration, topLevel) {
      // strict mode handling of `interface` since it's a reserved word
      if (this.state.strict && this.match(types.name) && this.state.value === "interface") {
        var node = this.startNode();
        this.next();
        return this.flowParseInterface(node);
      } else {
        return inner.call(this, declaration, topLevel);
      }
    };
  });

  // declares, interfaces and type aliases
  instance.extend("parseExpressionStatement", function (inner) {
    return function (node, expr) {
      if (expr.type === "Identifier") {
        if (expr.name === "declare") {
          if (this.match(types._class) || this.match(types.name) || this.match(types._function) || this.match(types._var) || this.match(types._export)) {
            return this.flowParseDeclare(node);
          }
        } else if (this.match(types.name)) {
          if (expr.name === "interface") {
            return this.flowParseInterface(node);
          } else if (expr.name === "type") {
            return this.flowParseTypeAlias(node);
          } else if (expr.name === "opaque") {
            return this.flowParseOpaqueType(node, false);
          }
        }
      }

      return inner.call(this, node, expr);
    };
  });

  // export type
  instance.extend("shouldParseExportDeclaration", function (inner) {
    return function () {
      return this.isContextual("type") || this.isContextual("interface") || this.isContextual("opaque") || inner.call(this);
    };
  });

  instance.extend("isExportDefaultSpecifier", function (inner) {
    return function () {
      if (this.match(types.name) && (this.state.value === "type" || this.state.value === "interface" || this.state.value === "opaque")) {
        return false;
      }

      return inner.call(this);
    };
  });

  instance.extend("parseConditional", function (inner) {
    return function (expr, noIn, startPos, startLoc, refNeedsArrowPos) {
      // only do the expensive clone if there is a question mark
      // and if we come from inside parens
      if (refNeedsArrowPos && this.match(types.question)) {
        var state = this.state.clone();
        try {
          return inner.call(this, expr, noIn, startPos, startLoc);
        } catch (err) {
          if (err instanceof SyntaxError) {
            this.state = state;
            refNeedsArrowPos.start = err.pos || this.state.start;
            return expr;
          } else {
            // istanbul ignore next: no such error is expected
            throw err;
          }
        }
      }

      return inner.call(this, expr, noIn, startPos, startLoc);
    };
  });

  instance.extend("parseParenItem", function (inner) {
    return function (node, startPos, startLoc) {
      node = inner.call(this, node, startPos, startLoc);
      if (this.eat(types.question)) {
        node.optional = true;
      }

      if (this.match(types.colon)) {
        var typeCastNode = this.startNodeAt(startPos, startLoc);
        typeCastNode.expression = node;
        typeCastNode.typeAnnotation = this.flowParseTypeAnnotation();

        return this.finishNode(typeCastNode, "TypeCastExpression");
      }

      return node;
    };
  });

  instance.extend("parseExport", function (inner) {
    return function (node) {
      node = inner.call(this, node);
      if (node.type === "ExportNamedDeclaration") {
        node.exportKind = node.exportKind || "value";
      }
      return node;
    };
  });

  instance.extend("parseExportDeclaration", function (inner) {
    return function (node) {
      if (this.isContextual("type")) {
        node.exportKind = "type";

        var declarationNode = this.startNode();
        this.next();

        if (this.match(types.braceL)) {
          // export type { foo, bar };
          node.specifiers = this.parseExportSpecifiers();
          this.parseExportFrom(node);
          return null;
        } else {
          // export type Foo = Bar;
          return this.flowParseTypeAlias(declarationNode);
        }
      } else if (this.isContextual("opaque")) {
        node.exportKind = "type";

        var _declarationNode = this.startNode();
        this.next();
        // export opaque type Foo = Bar;
        return this.flowParseOpaqueType(_declarationNode, false);
      } else if (this.isContextual("interface")) {
        node.exportKind = "type";
        var _declarationNode2 = this.startNode();
        this.next();
        return this.flowParseInterface(_declarationNode2);
      } else {
        return inner.call(this, node);
      }
    };
  });

  instance.extend("parseClassId", function (inner) {
    return function (node) {
      inner.apply(this, arguments);
      if (this.isRelational("<")) {
        node.typeParameters = this.flowParseTypeParameterDeclaration();
      }
    };
  });

  // don't consider `void` to be a keyword as then it'll use the void token type
  // and set startExpr
  instance.extend("isKeyword", function (inner) {
    return function (name) {
      if (this.state.inType && name === "void") {
        return false;
      } else {
        return inner.call(this, name);
      }
    };
  });

  // ensure that inside flow types, we bypass the jsx parser plugin
  instance.extend("readToken", function (inner) {
    return function (code) {
      if (this.state.inType && (code === 62 || code === 60)) {
        return this.finishOp(types.relational, 1);
      } else {
        return inner.call(this, code);
      }
    };
  });

  // don't lex any token as a jsx one inside a flow type
  instance.extend("jsx_readToken", function (inner) {
    return function () {
      if (!this.state.inType) return inner.call(this);
    };
  });

  instance.extend("toAssignable", function (inner) {
    return function (node, isBinding, contextDescription) {
      if (node.type === "TypeCastExpression") {
        return inner.call(this, this.typeCastToParameter(node), isBinding, contextDescription);
      } else {
        return inner.call(this, node, isBinding, contextDescription);
      }
    };
  });

  // turn type casts that we found in function parameter head into type annotated params
  instance.extend("toAssignableList", function (inner) {
    return function (exprList, isBinding, contextDescription) {
      for (var i = 0; i < exprList.length; i++) {
        var expr = exprList[i];
        if (expr && expr.type === "TypeCastExpression") {
          exprList[i] = this.typeCastToParameter(expr);
        }
      }
      return inner.call(this, exprList, isBinding, contextDescription);
    };
  });

  // this is a list of nodes, from something like a call expression, we need to filter the
  // type casts that we've found that are illegal in this context
  instance.extend("toReferencedList", function () {
    return function (exprList) {
      for (var i = 0; i < exprList.length; i++) {
        var expr = exprList[i];
        if (expr && expr._exprListItem && expr.type === "TypeCastExpression") {
          this.raise(expr.start, "Unexpected type cast");
        }
      }

      return exprList;
    };
  });

  // parse an item inside a expression list eg. `(NODE, NODE)` where NODE represents
  // the position where this function is called
  instance.extend("parseExprListItem", function (inner) {
    return function () {
      var container = this.startNode();

      for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
        args[_key] = arguments[_key];
      }

      var node = inner.call.apply(inner, [this].concat(args));
      if (this.match(types.colon)) {
        container._exprListItem = true;
        container.expression = node;
        container.typeAnnotation = this.flowParseTypeAnnotation();
        return this.finishNode(container, "TypeCastExpression");
      } else {
        return node;
      }
    };
  });

  instance.extend("checkLVal", function (inner) {
    return function (node) {
      if (node.type !== "TypeCastExpression") {
        return inner.apply(this, arguments);
      }
    };
  });

  // parse class property type annotations
  instance.extend("parseClassProperty", function (inner) {
    return function (node) {
      delete node.variancePos;
      if (this.match(types.colon)) {
        node.typeAnnotation = this.flowParseTypeAnnotation();
      }
      return inner.call(this, node);
    };
  });

  // determine whether or not we're currently in the position where a class method would appear
  instance.extend("isClassMethod", function (inner) {
    return function () {
      return this.isRelational("<") || inner.call(this);
    };
  });

  // determine whether or not we're currently in the position where a class property would appear
  instance.extend("isClassProperty", function (inner) {
    return function () {
      return this.match(types.colon) || inner.call(this);
    };
  });

  instance.extend("isNonstaticConstructor", function (inner) {
    return function (method) {
      return !this.match(types.colon) && inner.call(this, method);
    };
  });

  // parse type parameters for class methods
  instance.extend("parseClassMethod", function (inner) {
    return function (classBody, method) {
      if (method.variance) {
        this.unexpected(method.variancePos);
      }
      delete method.variance;
      delete method.variancePos;
      if (this.isRelational("<")) {
        method.typeParameters = this.flowParseTypeParameterDeclaration();
      }

      for (var _len2 = arguments.length, args = Array(_len2 > 2 ? _len2 - 2 : 0), _key2 = 2; _key2 < _len2; _key2++) {
        args[_key2 - 2] = arguments[_key2];
      }

      inner.call.apply(inner, [this, classBody, method].concat(args));
    };
  });

  // parse a the super class type parameters and implements
  instance.extend("parseClassSuper", function (inner) {
    return function (node, isStatement) {
      inner.call(this, node, isStatement);
      if (node.superClass && this.isRelational("<")) {
        node.superTypeParameters = this.flowParseTypeParameterInstantiation();
      }
      if (this.isContextual("implements")) {
        this.next();
        var implemented = node.implements = [];
        do {
          var _node = this.startNode();
          _node.id = this.parseIdentifier();
          if (this.isRelational("<")) {
            _node.typeParameters = this.flowParseTypeParameterInstantiation();
          } else {
            _node.typeParameters = null;
          }
          implemented.push(this.finishNode(_node, "ClassImplements"));
        } while (this.eat(types.comma));
      }
    };
  });

  instance.extend("parsePropertyName", function (inner) {
    return function (node) {
      var variancePos = this.state.start;
      var variance = this.flowParseVariance();
      var key = inner.call(this, node);
      node.variance = variance;
      node.variancePos = variancePos;
      return key;
    };
  });

  // parse type parameters for object method shorthand
  instance.extend("parseObjPropValue", function (inner) {
    return function (prop) {
      if (prop.variance) {
        this.unexpected(prop.variancePos);
      }
      delete prop.variance;
      delete prop.variancePos;

      var typeParameters = void 0;

      // method shorthand
      if (this.isRelational("<")) {
        typeParameters = this.flowParseTypeParameterDeclaration();
        if (!this.match(types.parenL)) this.unexpected();
      }

      inner.apply(this, arguments);

      // add typeParameters if we found them
      if (typeParameters) {
        (prop.value || prop).typeParameters = typeParameters;
      }
    };
  });

  instance.extend("parseAssignableListItemTypes", function () {
    return function (param) {
      if (this.eat(types.question)) {
        param.optional = true;
      }
      if (this.match(types.colon)) {
        param.typeAnnotation = this.flowParseTypeAnnotation();
      }
      this.finishNode(param, param.type);
      return param;
    };
  });

  instance.extend("parseMaybeDefault", function (inner) {
    return function () {
      for (var _len3 = arguments.length, args = Array(_len3), _key3 = 0; _key3 < _len3; _key3++) {
        args[_key3] = arguments[_key3];
      }

      var node = inner.apply(this, args);

      if (node.type === "AssignmentPattern" && node.typeAnnotation && node.right.start < node.typeAnnotation.start) {
        this.raise(node.typeAnnotation.start, "Type annotations must come before default assignments, e.g. instead of `age = 25: number` use `age: number = 25`");
      }

      return node;
    };
  });

  // parse typeof and type imports
  instance.extend("parseImportSpecifiers", function (inner) {
    return function (node) {
      node.importKind = "value";

      var kind = null;
      if (this.match(types._typeof)) {
        kind = "typeof";
      } else if (this.isContextual("type")) {
        kind = "type";
      }
      if (kind) {
        var lh = this.lookahead();
        if (lh.type === types.name && lh.value !== "from" || lh.type === types.braceL || lh.type === types.star) {
          this.next();
          node.importKind = kind;
        }
      }

      inner.call(this, node);
    };
  });

  // parse import-type/typeof shorthand
  instance.extend("parseImportSpecifier", function () {
    return function (node) {
      var specifier = this.startNode();
      var firstIdentLoc = this.state.start;
      var firstIdent = this.parseIdentifier(true);

      var specifierTypeKind = null;
      if (firstIdent.name === "type") {
        specifierTypeKind = "type";
      } else if (firstIdent.name === "typeof") {
        specifierTypeKind = "typeof";
      }

      var isBinding = false;
      if (this.isContextual("as")) {
        var as_ident = this.parseIdentifier(true);
        if (specifierTypeKind !== null && !this.match(types.name) && !this.state.type.keyword) {
          // `import {type as ,` or `import {type as }`
          specifier.imported = as_ident;
          specifier.importKind = specifierTypeKind;
          specifier.local = as_ident.__clone();
        } else {
          // `import {type as foo`
          specifier.imported = firstIdent;
          specifier.importKind = null;
          specifier.local = this.parseIdentifier();
        }
      } else if (specifierTypeKind !== null && (this.match(types.name) || this.state.type.keyword)) {
        // `import {type foo`
        specifier.imported = this.parseIdentifier(true);
        specifier.importKind = specifierTypeKind;
        if (this.eatContextual("as")) {
          specifier.local = this.parseIdentifier();
        } else {
          isBinding = true;
          specifier.local = specifier.imported.__clone();
        }
      } else {
        isBinding = true;
        specifier.imported = firstIdent;
        specifier.importKind = null;
        specifier.local = specifier.imported.__clone();
      }

      if ((node.importKind === "type" || node.importKind === "typeof") && (specifier.importKind === "type" || specifier.importKind === "typeof")) {
        this.raise(firstIdentLoc, "`The `type` and `typeof` keywords on named imports can only be used on regular `import` statements. It cannot be used with `import type` or `import typeof` statements`");
      }

      if (isBinding) this.checkReservedWord(specifier.local.name, specifier.start, true, true);

      this.checkLVal(specifier.local, true, undefined, "import specifier");
      node.specifiers.push(this.finishNode(specifier, "ImportSpecifier"));
    };
  });

  // parse function type parameters - function foo<T>() {}
  instance.extend("parseFunctionParams", function (inner) {
    return function (node) {
      if (this.isRelational("<")) {
        node.typeParameters = this.flowParseTypeParameterDeclaration();
      }
      inner.call(this, node);
    };
  });

  // parse flow type annotations on variable declarator heads - let foo: string = bar
  instance.extend("parseVarHead", function (inner) {
    return function (decl) {
      inner.call(this, decl);
      if (this.match(types.colon)) {
        decl.id.typeAnnotation = this.flowParseTypeAnnotation();
        this.finishNode(decl.id, decl.id.type);
      }
    };
  });

  // parse the return type of an async arrow function - let foo = (async (): number => {});
  instance.extend("parseAsyncArrowFromCallExpression", function (inner) {
    return function (node, call) {
      if (this.match(types.colon)) {
        var oldNoAnonFunctionType = this.state.noAnonFunctionType;
        this.state.noAnonFunctionType = true;
        node.returnType = this.flowParseTypeAnnotation();
        this.state.noAnonFunctionType = oldNoAnonFunctionType;
      }

      return inner.call(this, node, call);
    };
  });

  // todo description
  instance.extend("shouldParseAsyncArrow", function (inner) {
    return function () {
      return this.match(types.colon) || inner.call(this);
    };
  });

  // We need to support type parameter declarations for arrow functions. This
  // is tricky. There are three situations we need to handle
  //
  // 1. This is either JSX or an arrow function. We'll try JSX first. If that
  //    fails, we'll try an arrow function. If that fails, we'll throw the JSX
  //    error.
  // 2. This is an arrow function. We'll parse the type parameter declaration,
  //    parse the rest, make sure the rest is an arrow function, and go from
  //    there
  // 3. This is neither. Just call the inner function
  instance.extend("parseMaybeAssign", function (inner) {
    return function () {
      var jsxError = null;

      for (var _len4 = arguments.length, args = Array(_len4), _key4 = 0; _key4 < _len4; _key4++) {
        args[_key4] = arguments[_key4];
      }

      if (types.jsxTagStart && this.match(types.jsxTagStart)) {
        var state = this.state.clone();
        try {
          return inner.apply(this, args);
        } catch (err) {
          if (err instanceof SyntaxError) {
            this.state = state;

            // Remove `tc.j_expr` and `tc.j_oTag` from context added
            // by parsing `jsxTagStart` to stop the JSX plugin from
            // messing with the tokens
            this.state.context.length -= 2;

            jsxError = err;
          } else {
            // istanbul ignore next: no such error is expected
            throw err;
          }
        }
      }

      if (jsxError != null || this.isRelational("<")) {
        var arrowExpression = void 0;
        var typeParameters = void 0;
        try {
          typeParameters = this.flowParseTypeParameterDeclaration();

          arrowExpression = inner.apply(this, args);
          arrowExpression.typeParameters = typeParameters;
          arrowExpression.start = typeParameters.start;
          arrowExpression.loc.start = typeParameters.loc.start;
        } catch (err) {
          throw jsxError || err;
        }

        if (arrowExpression.type === "ArrowFunctionExpression") {
          return arrowExpression;
        } else if (jsxError != null) {
          throw jsxError;
        } else {
          this.raise(typeParameters.start, "Expected an arrow function after this type parameter declaration");
        }
      }

      return inner.apply(this, args);
    };
  });

  // handle return types for arrow functions
  instance.extend("parseArrow", function (inner) {
    return function (node) {
      if (this.match(types.colon)) {
        var state = this.state.clone();
        try {
          var oldNoAnonFunctionType = this.state.noAnonFunctionType;
          this.state.noAnonFunctionType = true;
          var returnType = this.flowParseTypeAndPredicateAnnotation();
          this.state.noAnonFunctionType = oldNoAnonFunctionType;

          if (this.canInsertSemicolon()) this.unexpected();
          if (!this.match(types.arrow)) this.unexpected();
          // assign after it is clear it is an arrow
          node.returnType = returnType;
        } catch (err) {
          if (err instanceof SyntaxError) {
            this.state = state;
          } else {
            // istanbul ignore next: no such error is expected
            throw err;
          }
        }
      }

      return inner.call(this, node);
    };
  });

  instance.extend("shouldParseArrow", function (inner) {
    return function () {
      return this.match(types.colon) || inner.call(this);
    };
  });
};

// Adapted from String.fromcodepoint to export the function without modifying String
/*! https://mths.be/fromcodepoint v0.2.1 by @mathias */

// The MIT License (MIT)
// Copyright (c) Mathias Bynens
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
// associated documentation files (the "Software"), to deal in the Software without restriction,
// including without limitation the rights to use, copy, modify, merge, publish, distribute,
// sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
// NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

var fromCodePoint = String.fromCodePoint;

if (!fromCodePoint) {
  var stringFromCharCode = String.fromCharCode;
  var floor = Math.floor;
  fromCodePoint = function fromCodePoint() {
    var MAX_SIZE = 0x4000;
    var codeUnits = [];
    var highSurrogate = void 0;
    var lowSurrogate = void 0;
    var index = -1;
    var length = arguments.length;
    if (!length) {
      return "";
    }
    var result = "";
    while (++index < length) {
      var codePoint = Number(arguments[index]);
      if (!isFinite(codePoint) || // `NaN`, `+Infinity`, or `-Infinity`
      codePoint < 0 || // not a valid Unicode code point
      codePoint > 0x10FFFF || // not a valid Unicode code point
      floor(codePoint) != codePoint // not an integer
      ) {
          throw RangeError("Invalid code point: " + codePoint);
        }
      if (codePoint <= 0xFFFF) {
        // BMP code point
        codeUnits.push(codePoint);
      } else {
        // Astral code point; split in surrogate halves
        // https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
        codePoint -= 0x10000;
        highSurrogate = (codePoint >> 10) + 0xD800;
        lowSurrogate = codePoint % 0x400 + 0xDC00;
        codeUnits.push(highSurrogate, lowSurrogate);
      }
      if (index + 1 == length || codeUnits.length > MAX_SIZE) {
        result += stringFromCharCode.apply(null, codeUnits);
        codeUnits.length = 0;
      }
    }
    return result;
  };
}

var fromCodePoint$1 = fromCodePoint;

var XHTMLEntities = {
  quot: "\"",
  amp: "&",
  apos: "'",
  lt: "<",
  gt: ">",
  nbsp: "\xA0",
  iexcl: "\xA1",
  cent: "\xA2",
  pound: "\xA3",
  curren: "\xA4",
  yen: "\xA5",
  brvbar: "\xA6",
  sect: "\xA7",
  uml: "\xA8",
  copy: "\xA9",
  ordf: "\xAA",
  laquo: "\xAB",
  not: "\xAC",
  shy: "\xAD",
  reg: "\xAE",
  macr: "\xAF",
  deg: "\xB0",
  plusmn: "\xB1",
  sup2: "\xB2",
  sup3: "\xB3",
  acute: "\xB4",
  micro: "\xB5",
  para: "\xB6",
  middot: "\xB7",
  cedil: "\xB8",
  sup1: "\xB9",
  ordm: "\xBA",
  raquo: "\xBB",
  frac14: "\xBC",
  frac12: "\xBD",
  frac34: "\xBE",
  iquest: "\xBF",
  Agrave: "\xC0",
  Aacute: "\xC1",
  Acirc: "\xC2",
  Atilde: "\xC3",
  Auml: "\xC4",
  Aring: "\xC5",
  AElig: "\xC6",
  Ccedil: "\xC7",
  Egrave: "\xC8",
  Eacute: "\xC9",
  Ecirc: "\xCA",
  Euml: "\xCB",
  Igrave: "\xCC",
  Iacute: "\xCD",
  Icirc: "\xCE",
  Iuml: "\xCF",
  ETH: "\xD0",
  Ntilde: "\xD1",
  Ograve: "\xD2",
  Oacute: "\xD3",
  Ocirc: "\xD4",
  Otilde: "\xD5",
  Ouml: "\xD6",
  times: "\xD7",
  Oslash: "\xD8",
  Ugrave: "\xD9",
  Uacute: "\xDA",
  Ucirc: "\xDB",
  Uuml: "\xDC",
  Yacute: "\xDD",
  THORN: "\xDE",
  szlig: "\xDF",
  agrave: "\xE0",
  aacute: "\xE1",
  acirc: "\xE2",
  atilde: "\xE3",
  auml: "\xE4",
  aring: "\xE5",
  aelig: "\xE6",
  ccedil: "\xE7",
  egrave: "\xE8",
  eacute: "\xE9",
  ecirc: "\xEA",
  euml: "\xEB",
  igrave: "\xEC",
  iacute: "\xED",
  icirc: "\xEE",
  iuml: "\xEF",
  eth: "\xF0",
  ntilde: "\xF1",
  ograve: "\xF2",
  oacute: "\xF3",
  ocirc: "\xF4",
  otilde: "\xF5",
  ouml: "\xF6",
  divide: "\xF7",
  oslash: "\xF8",
  ugrave: "\xF9",
  uacute: "\xFA",
  ucirc: "\xFB",
  uuml: "\xFC",
  yacute: "\xFD",
  thorn: "\xFE",
  yuml: "\xFF",
  OElig: "\u0152",
  oelig: "\u0153",
  Scaron: "\u0160",
  scaron: "\u0161",
  Yuml: "\u0178",
  fnof: "\u0192",
  circ: "\u02C6",
  tilde: "\u02DC",
  Alpha: "\u0391",
  Beta: "\u0392",
  Gamma: "\u0393",
  Delta: "\u0394",
  Epsilon: "\u0395",
  Zeta: "\u0396",
  Eta: "\u0397",
  Theta: "\u0398",
  Iota: "\u0399",
  Kappa: "\u039A",
  Lambda: "\u039B",
  Mu: "\u039C",
  Nu: "\u039D",
  Xi: "\u039E",
  Omicron: "\u039F",
  Pi: "\u03A0",
  Rho: "\u03A1",
  Sigma: "\u03A3",
  Tau: "\u03A4",
  Upsilon: "\u03A5",
  Phi: "\u03A6",
  Chi: "\u03A7",
  Psi: "\u03A8",
  Omega: "\u03A9",
  alpha: "\u03B1",
  beta: "\u03B2",
  gamma: "\u03B3",
  delta: "\u03B4",
  epsilon: "\u03B5",
  zeta: "\u03B6",
  eta: "\u03B7",
  theta: "\u03B8",
  iota: "\u03B9",
  kappa: "\u03BA",
  lambda: "\u03BB",
  mu: "\u03BC",
  nu: "\u03BD",
  xi: "\u03BE",
  omicron: "\u03BF",
  pi: "\u03C0",
  rho: "\u03C1",
  sigmaf: "\u03C2",
  sigma: "\u03C3",
  tau: "\u03C4",
  upsilon: "\u03C5",
  phi: "\u03C6",
  chi: "\u03C7",
  psi: "\u03C8",
  omega: "\u03C9",
  thetasym: "\u03D1",
  upsih: "\u03D2",
  piv: "\u03D6",
  ensp: "\u2002",
  emsp: "\u2003",
  thinsp: "\u2009",
  zwnj: "\u200C",
  zwj: "\u200D",
  lrm: "\u200E",
  rlm: "\u200F",
  ndash: "\u2013",
  mdash: "\u2014",
  lsquo: "\u2018",
  rsquo: "\u2019",
  sbquo: "\u201A",
  ldquo: "\u201C",
  rdquo: "\u201D",
  bdquo: "\u201E",
  dagger: "\u2020",
  Dagger: "\u2021",
  bull: "\u2022",
  hellip: "\u2026",
  permil: "\u2030",
  prime: "\u2032",
  Prime: "\u2033",
  lsaquo: "\u2039",
  rsaquo: "\u203A",
  oline: "\u203E",
  frasl: "\u2044",
  euro: "\u20AC",
  image: "\u2111",
  weierp: "\u2118",
  real: "\u211C",
  trade: "\u2122",
  alefsym: "\u2135",
  larr: "\u2190",
  uarr: "\u2191",
  rarr: "\u2192",
  darr: "\u2193",
  harr: "\u2194",
  crarr: "\u21B5",
  lArr: "\u21D0",
  uArr: "\u21D1",
  rArr: "\u21D2",
  dArr: "\u21D3",
  hArr: "\u21D4",
  forall: "\u2200",
  part: "\u2202",
  exist: "\u2203",
  empty: "\u2205",
  nabla: "\u2207",
  isin: "\u2208",
  notin: "\u2209",
  ni: "\u220B",
  prod: "\u220F",
  sum: "\u2211",
  minus: "\u2212",
  lowast: "\u2217",
  radic: "\u221A",
  prop: "\u221D",
  infin: "\u221E",
  ang: "\u2220",
  and: "\u2227",
  or: "\u2228",
  cap: "\u2229",
  cup: "\u222A",
  "int": "\u222B",
  there4: "\u2234",
  sim: "\u223C",
  cong: "\u2245",
  asymp: "\u2248",
  ne: "\u2260",
  equiv: "\u2261",
  le: "\u2264",
  ge: "\u2265",
  sub: "\u2282",
  sup: "\u2283",
  nsub: "\u2284",
  sube: "\u2286",
  supe: "\u2287",
  oplus: "\u2295",
  otimes: "\u2297",
  perp: "\u22A5",
  sdot: "\u22C5",
  lceil: "\u2308",
  rceil: "\u2309",
  lfloor: "\u230A",
  rfloor: "\u230B",
  lang: "\u2329",
  rang: "\u232A",
  loz: "\u25CA",
  spades: "\u2660",
  clubs: "\u2663",
  hearts: "\u2665",
  diams: "\u2666"
};

var HEX_NUMBER = /^[\da-fA-F]+$/;
var DECIMAL_NUMBER = /^\d+$/;

types$1.j_oTag = new TokContext("<tag", false);
types$1.j_cTag = new TokContext("</tag", false);
types$1.j_expr = new TokContext("<tag>...</tag>", true, true);

types.jsxName = new TokenType("jsxName");
types.jsxText = new TokenType("jsxText", { beforeExpr: true });
types.jsxTagStart = new TokenType("jsxTagStart", { startsExpr: true });
types.jsxTagEnd = new TokenType("jsxTagEnd");

types.jsxTagStart.updateContext = function () {
  this.state.context.push(types$1.j_expr); // treat as beginning of JSX expression
  this.state.context.push(types$1.j_oTag); // start opening tag context
  this.state.exprAllowed = false;
};

types.jsxTagEnd.updateContext = function (prevType) {
  var out = this.state.context.pop();
  if (out === types$1.j_oTag && prevType === types.slash || out === types$1.j_cTag) {
    this.state.context.pop();
    this.state.exprAllowed = this.curContext() === types$1.j_expr;
  } else {
    this.state.exprAllowed = true;
  }
};

var pp$9 = Parser.prototype;

// Reads inline JSX contents token.

pp$9.jsxReadToken = function () {
  var out = "";
  var chunkStart = this.state.pos;
  for (;;) {
    if (this.state.pos >= this.input.length) {
      this.raise(this.state.start, "Unterminated JSX contents");
    }

    var ch = this.input.charCodeAt(this.state.pos);

    switch (ch) {
      case 60: // "<"
      case 123:
        // "{"
        if (this.state.pos === this.state.start) {
          if (ch === 60 && this.state.exprAllowed) {
            ++this.state.pos;
            return this.finishToken(types.jsxTagStart);
          }
          return this.getTokenFromCode(ch);
        }
        out += this.input.slice(chunkStart, this.state.pos);
        return this.finishToken(types.jsxText, out);

      case 38:
        // "&"
        out += this.input.slice(chunkStart, this.state.pos);
        out += this.jsxReadEntity();
        chunkStart = this.state.pos;
        break;

      default:
        if (isNewLine(ch)) {
          out += this.input.slice(chunkStart, this.state.pos);
          out += this.jsxReadNewLine(true);
          chunkStart = this.state.pos;
        } else {
          ++this.state.pos;
        }
    }
  }
};

pp$9.jsxReadNewLine = function (normalizeCRLF) {
  var ch = this.input.charCodeAt(this.state.pos);
  var out = void 0;
  ++this.state.pos;
  if (ch === 13 && this.input.charCodeAt(this.state.pos) === 10) {
    ++this.state.pos;
    out = normalizeCRLF ? "\n" : "\r\n";
  } else {
    out = String.fromCharCode(ch);
  }
  ++this.state.curLine;
  this.state.lineStart = this.state.pos;

  return out;
};

pp$9.jsxReadString = function (quote) {
  var out = "";
  var chunkStart = ++this.state.pos;
  for (;;) {
    if (this.state.pos >= this.input.length) {
      this.raise(this.state.start, "Unterminated string constant");
    }

    var ch = this.input.charCodeAt(this.state.pos);
    if (ch === quote) break;
    if (ch === 38) {
      // "&"
      out += this.input.slice(chunkStart, this.state.pos);
      out += this.jsxReadEntity();
      chunkStart = this.state.pos;
    } else if (isNewLine(ch)) {
      out += this.input.slice(chunkStart, this.state.pos);
      out += this.jsxReadNewLine(false);
      chunkStart = this.state.pos;
    } else {
      ++this.state.pos;
    }
  }
  out += this.input.slice(chunkStart, this.state.pos++);
  return this.finishToken(types.string, out);
};

pp$9.jsxReadEntity = function () {
  var str = "";
  var count = 0;
  var entity = void 0;
  var ch = this.input[this.state.pos];

  var startPos = ++this.state.pos;
  while (this.state.pos < this.input.length && count++ < 10) {
    ch = this.input[this.state.pos++];
    if (ch === ";") {
      if (str[0] === "#") {
        if (str[1] === "x") {
          str = str.substr(2);
          if (HEX_NUMBER.test(str)) entity = fromCodePoint$1(parseInt(str, 16));
        } else {
          str = str.substr(1);
          if (DECIMAL_NUMBER.test(str)) entity = fromCodePoint$1(parseInt(str, 10));
        }
      } else {
        entity = XHTMLEntities[str];
      }
      break;
    }
    str += ch;
  }
  if (!entity) {
    this.state.pos = startPos;
    return "&";
  }
  return entity;
};

// Read a JSX identifier (valid tag or attribute name).
//
// Optimized version since JSX identifiers can"t contain
// escape characters and so can be read as single slice.
// Also assumes that first character was already checked
// by isIdentifierStart in readToken.

pp$9.jsxReadWord = function () {
  var ch = void 0;
  var start = this.state.pos;
  do {
    ch = this.input.charCodeAt(++this.state.pos);
  } while (isIdentifierChar(ch) || ch === 45); // "-"
  return this.finishToken(types.jsxName, this.input.slice(start, this.state.pos));
};

// Transforms JSX element name to string.

function getQualifiedJSXName(object) {
  if (object.type === "JSXIdentifier") {
    return object.name;
  }

  if (object.type === "JSXNamespacedName") {
    return object.namespace.name + ":" + object.name.name;
  }

  if (object.type === "JSXMemberExpression") {
    return getQualifiedJSXName(object.object) + "." + getQualifiedJSXName(object.property);
  }
}

// Parse next token as JSX identifier

pp$9.jsxParseIdentifier = function () {
  var node = this.startNode();
  if (this.match(types.jsxName)) {
    node.name = this.state.value;
  } else if (this.state.type.keyword) {
    node.name = this.state.type.keyword;
  } else {
    this.unexpected();
  }
  this.next();
  return this.finishNode(node, "JSXIdentifier");
};

// Parse namespaced identifier.

pp$9.jsxParseNamespacedName = function () {
  var startPos = this.state.start;
  var startLoc = this.state.startLoc;
  var name = this.jsxParseIdentifier();
  if (!this.eat(types.colon)) return name;

  var node = this.startNodeAt(startPos, startLoc);
  node.namespace = name;
  node.name = this.jsxParseIdentifier();
  return this.finishNode(node, "JSXNamespacedName");
};

// Parses element name in any form - namespaced, member
// or single identifier.

pp$9.jsxParseElementName = function () {
  var startPos = this.state.start;
  var startLoc = this.state.startLoc;
  var node = this.jsxParseNamespacedName();
  while (this.eat(types.dot)) {
    var newNode = this.startNodeAt(startPos, startLoc);
    newNode.object = node;
    newNode.property = this.jsxParseIdentifier();
    node = this.finishNode(newNode, "JSXMemberExpression");
  }
  return node;
};

// Parses any type of JSX attribute value.

pp$9.jsxParseAttributeValue = function () {
  var node = void 0;
  switch (this.state.type) {
    case types.braceL:
      node = this.jsxParseExpressionContainer();
      if (node.expression.type === "JSXEmptyExpression") {
        this.raise(node.start, "JSX attributes must only be assigned a non-empty expression");
      } else {
        return node;
      }

    case types.jsxTagStart:
    case types.string:
      node = this.parseExprAtom();
      node.extra = null;
      return node;

    default:
      this.raise(this.state.start, "JSX value should be either an expression or a quoted JSX text");
  }
};

// JSXEmptyExpression is unique type since it doesn't actually parse anything,
// and so it should start at the end of last read token (left brace) and finish
// at the beginning of the next one (right brace).

pp$9.jsxParseEmptyExpression = function () {
  var node = this.startNodeAt(this.state.lastTokEnd, this.state.lastTokEndLoc);
  return this.finishNodeAt(node, "JSXEmptyExpression", this.state.start, this.state.startLoc);
};

// Parse JSX spread child

pp$9.jsxParseSpreadChild = function () {
  var node = this.startNode();
  this.expect(types.braceL);
  this.expect(types.ellipsis);
  node.expression = this.parseExpression();
  this.expect(types.braceR);

  return this.finishNode(node, "JSXSpreadChild");
};

// Parses JSX expression enclosed into curly brackets.


pp$9.jsxParseExpressionContainer = function () {
  var node = this.startNode();
  this.next();
  if (this.match(types.braceR)) {
    node.expression = this.jsxParseEmptyExpression();
  } else {
    node.expression = this.parseExpression();
  }
  this.expect(types.braceR);
  return this.finishNode(node, "JSXExpressionContainer");
};

// Parses following JSX attribute name-value pair.

pp$9.jsxParseAttribute = function () {
  var node = this.startNode();
  if (this.eat(types.braceL)) {
    this.expect(types.ellipsis);
    node.argument = this.parseMaybeAssign();
    this.expect(types.braceR);
    return this.finishNode(node, "JSXSpreadAttribute");
  }
  node.name = this.jsxParseNamespacedName();
  node.value = this.eat(types.eq) ? this.jsxParseAttributeValue() : null;
  return this.finishNode(node, "JSXAttribute");
};

// Parses JSX opening tag starting after "<".

pp$9.jsxParseOpeningElementAt = function (startPos, startLoc) {
  var node = this.startNodeAt(startPos, startLoc);
  node.attributes = [];
  node.name = this.jsxParseElementName();
  while (!this.match(types.slash) && !this.match(types.jsxTagEnd)) {
    node.attributes.push(this.jsxParseAttribute());
  }
  node.selfClosing = this.eat(types.slash);
  this.expect(types.jsxTagEnd);
  return this.finishNode(node, "JSXOpeningElement");
};

// Parses JSX closing tag starting after "</".

pp$9.jsxParseClosingElementAt = function (startPos, startLoc) {
  var node = this.startNodeAt(startPos, startLoc);
  node.name = this.jsxParseElementName();
  this.expect(types.jsxTagEnd);
  return this.finishNode(node, "JSXClosingElement");
};

// Parses entire JSX element, including it"s opening tag
// (starting after "<"), attributes, contents and closing tag.

pp$9.jsxParseElementAt = function (startPos, startLoc) {
  var node = this.startNodeAt(startPos, startLoc);
  var children = [];
  var openingElement = this.jsxParseOpeningElementAt(startPos, startLoc);
  var closingElement = null;

  if (!openingElement.selfClosing) {
    contents: for (;;) {
      switch (this.state.type) {
        case types.jsxTagStart:
          startPos = this.state.start;startLoc = this.state.startLoc;
          this.next();
          if (this.eat(types.slash)) {
            closingElement = this.jsxParseClosingElementAt(startPos, startLoc);
            break contents;
          }
          children.push(this.jsxParseElementAt(startPos, startLoc));
          break;

        case types.jsxText:
          children.push(this.parseExprAtom());
          break;

        case types.braceL:
          if (this.lookahead().type === types.ellipsis) {
            children.push(this.jsxParseSpreadChild());
          } else {
            children.push(this.jsxParseExpressionContainer());
          }

          break;

        // istanbul ignore next - should never happen
        default:
          this.unexpected();
      }
    }

    if (getQualifiedJSXName(closingElement.name) !== getQualifiedJSXName(openingElement.name)) {
      this.raise(closingElement.start, "Expected corresponding JSX closing tag for <" + getQualifiedJSXName(openingElement.name) + ">");
    }
  }

  node.openingElement = openingElement;
  node.closingElement = closingElement;
  node.children = children;
  if (this.match(types.relational) && this.state.value === "<") {
    this.raise(this.state.start, "Adjacent JSX elements must be wrapped in an enclosing tag");
  }
  return this.finishNode(node, "JSXElement");
};

// Parses entire JSX element from current position.

pp$9.jsxParseElement = function () {
  var startPos = this.state.start;
  var startLoc = this.state.startLoc;
  this.next();
  return this.jsxParseElementAt(startPos, startLoc);
};

var jsxPlugin = function (instance) {
  instance.extend("parseExprAtom", function (inner) {
    return function (refShortHandDefaultPos) {
      if (this.match(types.jsxText)) {
        var node = this.parseLiteral(this.state.value, "JSXText");
        // https://github.com/babel/babel/issues/2078
        node.extra = null;
        return node;
      } else if (this.match(types.jsxTagStart)) {
        return this.jsxParseElement();
      } else {
        return inner.call(this, refShortHandDefaultPos);
      }
    };
  });

  instance.extend("readToken", function (inner) {
    return function (code) {
      if (this.state.inPropertyName) return inner.call(this, code);

      var context = this.curContext();

      if (context === types$1.j_expr) {
        return this.jsxReadToken();
      }

      if (context === types$1.j_oTag || context === types$1.j_cTag) {
        if (isIdentifierStart(code)) {
          return this.jsxReadWord();
        }

        if (code === 62) {
          ++this.state.pos;
          return this.finishToken(types.jsxTagEnd);
        }

        if ((code === 34 || code === 39) && context === types$1.j_oTag) {
          return this.jsxReadString(code);
        }
      }

      if (code === 60 && this.state.exprAllowed) {
        ++this.state.pos;
        return this.finishToken(types.jsxTagStart);
      }

      return inner.call(this, code);
    };
  });

  instance.extend("updateContext", function (inner) {
    return function (prevType) {
      if (this.match(types.braceL)) {
        var curContext = this.curContext();
        if (curContext === types$1.j_oTag) {
          this.state.context.push(types$1.braceExpression);
        } else if (curContext === types$1.j_expr) {
          this.state.context.push(types$1.templateQuasi);
        } else {
          inner.call(this, prevType);
        }
        this.state.exprAllowed = true;
      } else if (this.match(types.slash) && prevType === types.jsxTagStart) {
        this.state.context.length -= 2; // do not consider JSX expr -> JSX open tag -> ... anymore
        this.state.context.push(types$1.j_cTag); // reconsider as closing tag context
        this.state.exprAllowed = false;
      } else {
        return inner.call(this, prevType);
      }
    };
  });
};

plugins.estree = estreePlugin;
plugins.flow = flowPlugin;
plugins.jsx = jsxPlugin;

function parse(input, options) {
  return new Parser(options, input).parse();
}

function parseExpression(input, options) {
  var parser = new Parser(options, input);
  if (parser.options.strictMode) {
    parser.state.strict = true;
  }
  return parser.getExpression();
}

exports.parse = parse;
exports.parseExpression = parseExpression;
exports.tokTypes = types;
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