add node_modules to address #4364

8 files changed, 2971 insertions, 0 deletions

diff --git a/node_modules/babylon/lib/parser/comments.js b/node_modules/babylon/lib/parser/comments.js
new file mode 100644
index 000000000..577e1c251
--- /dev/null
+++ b/node_modules/babylon/lib/parser/comments.js
@@ -0,0 +1,163 @@
+"use strict";
+
+var _index = require("./index");
+
+var _index2 = _interopRequireDefault(_index);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function last(stack) {
+  return stack[stack.length - 1];
+} /* 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.
+ */
+
+var pp = _index2.default.prototype;
+
+pp.addComment = function (comment) {
+  if (this.filename) comment.loc.filename = this.filename;
+  this.state.trailingComments.push(comment);
+  this.state.leadingComments.push(comment);
+};
+
+pp.processComment = function (node) {
+  if (node.type === "Program" && node.body.length > 0) return;
+
+  var stack = this.state.commentStack;
+
+  var 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.
+  while (stack.length > 0 && last(stack).start >= node.start) {
+    lastChild = stack.pop();
+  }
+
+  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);
+};
\ No newline at end of file
diff --git a/node_modules/babylon/lib/parser/expression.js b/node_modules/babylon/lib/parser/expression.js
new file mode 100644
index 000000000..ec437b9dc
--- /dev/null
+++ b/node_modules/babylon/lib/parser/expression.js
@@ -0,0 +1,1096 @@
+"use strict";
+
+var _types = require("../tokenizer/types");
+
+var _index = require("./index");
+
+var _index2 = _interopRequireDefault(_index);
+
+var _identifier = require("../util/identifier");
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+var pp = _index2.default.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.
+
+/* eslint indent: 0 */
+/* 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
+
+pp.checkPropClash = function (prop, propHash) {
+  if (prop.computed) return;
+
+  var key = prop.key;
+  var name = void 0;
+  switch (key.type) {
+    case "Identifier":
+      name = key.name;
+      break;
+
+    case "StringLiteral":
+    case "NumericLiteral":
+      name = String(key.value);
+      break;
+
+    default:
+      return;
+  }
+
+  if (name === "__proto__" && prop.kind === "init") {
+    if (propHash.proto) this.raise(key.start, "Redefinition of __proto__ property");
+    propHash.proto = true;
+  }
+};
+
+// ### 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 initalization 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.parseExpression = function (noIn, refShorthandDefaultPos) {
+  var startPos = this.state.start,
+      startLoc = this.state.startLoc;
+  var expr = this.parseMaybeAssign(noIn, refShorthandDefaultPos);
+  if (this.match(_types.types.comma)) {
+    var node = this.startNodeAt(startPos, startLoc);
+    node.expressions = [expr];
+    while (this.eat(_types.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.parseMaybeAssign = function (noIn, refShorthandDefaultPos, afterLeftParse, refNeedsArrowPos) {
+  if (this.match(_types.types._yield) && this.state.inGenerator) {
+    return this.parseYield();
+  }
+
+  var failOnShorthandAssign = void 0;
+  if (refShorthandDefaultPos) {
+    failOnShorthandAssign = false;
+  } else {
+    refShorthandDefaultPos = { start: 0 };
+    failOnShorthandAssign = true;
+  }
+
+  var startPos = this.state.start;
+  var startLoc = this.state.startLoc;
+
+  if (this.match(_types.types.parenL) || this.match(_types.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.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.parseMaybeConditional = function (noIn, refShorthandDefaultPos, refNeedsArrowPos) {
+  var startPos = this.state.start,
+      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.parseConditional = function (expr, noIn, startPos, startLoc) {
+  if (this.eat(_types.types.question)) {
+    var node = this.startNodeAt(startPos, startLoc);
+    node.test = expr;
+    node.consequent = this.parseMaybeAssign();
+    this.expect(_types.types.colon);
+    node.alternate = this.parseMaybeAssign(noIn);
+    return this.finishNode(node, "ConditionalExpression");
+  }
+  return expr;
+};
+
+// Start the precedence parser.
+
+pp.parseExprOps = function (noIn, refShorthandDefaultPos) {
+  var startPos = this.state.start,
+      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.parseExprOp = function (left, leftStartPos, leftStartLoc, minPrec, noIn) {
+  var prec = this.state.type.binop;
+  if (prec != null && (!noIn || !this.match(_types.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.types.logicalOR || op === _types.types.logicalAND ? "LogicalExpression" : "BinaryExpression");
+      return this.parseExprOp(node, leftStartPos, leftStartLoc, minPrec, noIn);
+    }
+  }
+  return left;
+};
+
+// Parse unary operators, both prefix and postfix.
+
+pp.parseMaybeUnary = function (refShorthandDefaultPos) {
+  if (this.state.type.prefix) {
+    var node = this.startNode();
+    var update = this.match(_types.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.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,
+      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.parseExprSubscripts = function (refShorthandDefaultPos) {
+  var startPos = this.state.start,
+      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.parseSubscripts = function (base, startPos, startLoc, noCalls) {
+  for (;;) {
+    if (!noCalls && this.eat(_types.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.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.types.bracketL)) {
+      var _node3 = this.startNodeAt(startPos, startLoc);
+      _node3.object = base;
+      _node3.property = this.parseExpression();
+      _node3.computed = true;
+      this.expect(_types.types.bracketR);
+      base = this.finishNode(_node3, "MemberExpression");
+    } else if (!noCalls && this.match(_types.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.types.parenR, possibleAsync);
+      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.types.backQuote)) {
+      var _node5 = this.startNodeAt(startPos, startLoc);
+      _node5.tag = base;
+      _node5.quasi = this.parseTemplate();
+      base = this.finishNode(_node5, "TaggedTemplateExpression");
+    } else {
+      return base;
+    }
+  }
+};
+
+pp.parseCallExpressionArguments = function (close, possibleAsyncArrow) {
+  var innerParenStart = void 0;
+
+  var elts = [],
+      first = true;
+  while (!this.eat(close)) {
+    if (first) {
+      first = false;
+    } else {
+      this.expect(_types.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.types.parenL) && !innerParenStart) {
+      innerParenStart = this.state.start;
+    }
+
+    elts.push(this.parseExprListItem(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.shouldParseAsyncArrow = function () {
+  return this.match(_types.types.arrow);
+};
+
+pp.parseAsyncArrowFromCallExpression = function (node, call) {
+  this.expect(_types.types.arrow);
+  return this.parseArrowExpression(node, call.arguments, true);
+};
+
+// Parse a no-call expression (like argument of `new` or `::` operators).
+
+pp.parseNoCallExpr = function () {
+  var startPos = this.state.start,
+      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.parseExprAtom = function (refShorthandDefaultPos) {
+  var node = void 0,
+      canBeArrow = this.state.potentialArrowAt === this.state.start;
+  switch (this.state.type) {
+    case _types.types._super:
+      if (!this.state.inMethod && !this.options.allowSuperOutsideMethod) {
+        this.raise(this.state.start, "'super' outside of function or class");
+      }
+
+      node = this.startNode();
+      this.next();
+      if (!this.match(_types.types.parenL) && !this.match(_types.types.bracketL) && !this.match(_types.types.dot)) {
+        this.unexpected();
+      }
+      if (this.match(_types.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.types._this:
+      node = this.startNode();
+      this.next();
+      return this.finishNode(node, "ThisExpression");
+
+    case _types.types._yield:
+      if (this.state.inGenerator) this.unexpected();
+
+    case _types.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.types._function) && !this.canInsertSemicolon()) {
+        this.next();
+        return this.parseFunction(node, false, false, true);
+      } else if (canBeArrow && id.name === "async" && this.match(_types.types.name)) {
+        var params = [this.parseIdentifier()];
+        this.expect(_types.types.arrow);
+        // let foo = bar => {};
+        return this.parseArrowExpression(node, params, true);
+      }
+
+      if (canBeArrow && !this.canInsertSemicolon() && this.eat(_types.types.arrow)) {
+        return this.parseArrowExpression(node, [id]);
+      }
+
+      return id;
+
+    case _types.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.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.types.num:
+      return this.parseLiteral(this.state.value, "NumericLiteral");
+
+    case _types.types.string:
+      return this.parseLiteral(this.state.value, "StringLiteral");
+
+    case _types.types._null:
+      node = this.startNode();
+      this.next();
+      return this.finishNode(node, "NullLiteral");
+
+    case _types.types._true:case _types.types._false:
+      node = this.startNode();
+      node.value = this.match(_types.types._true);
+      this.next();
+      return this.finishNode(node, "BooleanLiteral");
+
+    case _types.types.parenL:
+      return this.parseParenAndDistinguishExpression(null, null, canBeArrow);
+
+    case _types.types.bracketL:
+      node = this.startNode();
+      this.next();
+      node.elements = this.parseExprList(_types.types.bracketR, true, refShorthandDefaultPos);
+      this.toReferencedList(node.elements);
+      return this.finishNode(node, "ArrayExpression");
+
+    case _types.types.braceL:
+      return this.parseObj(false, refShorthandDefaultPos);
+
+    case _types.types._function:
+      return this.parseFunctionExpression();
+
+    case _types.types.at:
+      this.parseDecorators();
+
+    case _types.types._class:
+      node = this.startNode();
+      this.takeDecorators(node);
+      return this.parseClass(node, false);
+
+    case _types.types._new:
+      return this.parseNew();
+
+    case _types.types.backQuote:
+      return this.parseTemplate();
+
+    case _types.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.parseFunctionExpression = function () {
+  var node = this.startNode();
+  var meta = this.parseIdentifier(true);
+  if (this.state.inGenerator && this.eat(_types.types.dot) && this.hasPlugin("functionSent")) {
+    return this.parseMetaProperty(node, meta, "sent");
+  } else {
+    return this.parseFunction(node, false);
+  }
+};
+
+pp.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.parseLiteral = function (value, type) {
+  var node = this.startNode();
+  this.addExtra(node, "rawValue", value);
+  this.addExtra(node, "raw", this.input.slice(this.state.start, this.state.end));
+  node.value = value;
+  this.next();
+  return this.finishNode(node, type);
+};
+
+pp.parseParenExpression = function () {
+  this.expect(_types.types.parenL);
+  var val = this.parseExpression();
+  this.expect(_types.types.parenR);
+  return val;
+};
+
+pp.parseParenAndDistinguishExpression = function (startPos, startLoc, canBeArrow, isAsync) {
+  startPos = startPos || this.state.start;
+  startLoc = startLoc || this.state.startLoc;
+
+  var val = void 0;
+  this.expect(_types.types.parenL);
+
+  var innerStartPos = this.state.start,
+      innerStartLoc = this.state.startLoc;
+  var exprList = [],
+      first = true;
+  var refShorthandDefaultPos = { start: 0 },
+      spreadStart = void 0,
+      optionalCommaStart = void 0;
+  var refNeedsArrowPos = { start: 0 };
+  while (!this.match(_types.types.parenR)) {
+    if (first) {
+      first = false;
+    } else {
+      this.expect(_types.types.comma, refNeedsArrowPos.start || null);
+      if (this.match(_types.types.parenR)) {
+        optionalCommaStart = this.state.start;
+        break;
+      }
+    }
+
+    if (this.match(_types.types.ellipsis)) {
+      var spreadNodeStartPos = this.state.start,
+          spreadNodeStartLoc = this.state.startLoc;
+      spreadStart = this.state.start;
+      exprList.push(this.parseParenItem(this.parseRest(), spreadNodeStartLoc, spreadNodeStartPos));
+      break;
+    } else {
+      exprList.push(this.parseMaybeAssign(false, refShorthandDefaultPos, this.parseParenItem, refNeedsArrowPos));
+    }
+  }
+
+  var innerEndPos = this.state.start;
+  var innerEndLoc = this.state.startLoc;
+  this.expect(_types.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, isAsync);
+  }
+
+  if (!exprList.length) {
+    if (isAsync) {
+      return;
+    } else {
+      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.shouldParseArrow = function () {
+  return !this.canInsertSemicolon();
+};
+
+pp.parseArrow = function (node) {
+  if (this.eat(_types.types.arrow)) {
+    return node;
+  }
+};
+
+pp.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.parseNew = function () {
+  var node = this.startNode();
+  var meta = this.parseIdentifier(true);
+
+  if (this.eat(_types.types.dot)) {
+    return this.parseMetaProperty(node, meta, "target");
+  }
+
+  node.callee = this.parseNoCallExpr();
+
+  if (this.eat(_types.types.parenL)) {
+    node.arguments = this.parseExprList(_types.types.parenR);
+    this.toReferencedList(node.arguments);
+  } else {
+    node.arguments = [];
+  }
+
+  return this.finishNode(node, "NewExpression");
+};
+
+// Parse template expression.
+
+pp.parseTemplateElement = function () {
+  var elem = this.startNode();
+  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.types.backQuote);
+  return this.finishNode(elem, "TemplateElement");
+};
+
+pp.parseTemplate = function () {
+  var node = this.startNode();
+  this.next();
+  node.expressions = [];
+  var curElt = this.parseTemplateElement();
+  node.quasis = [curElt];
+  while (!curElt.tail) {
+    this.expect(_types.types.dollarBraceL);
+    node.expressions.push(this.parseExpression());
+    this.expect(_types.types.braceR);
+    node.quasis.push(curElt = this.parseTemplateElement());
+  }
+  this.next();
+  return this.finishNode(node, "TemplateLiteral");
+};
+
+// Parse an object literal or binding pattern.
+
+pp.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.types.braceR)) {
+    if (first) {
+      first = false;
+    } else {
+      this.expect(_types.types.comma);
+      if (this.eat(_types.types.braceR)) break;
+    }
+
+    while (this.match(_types.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.types.ellipsis)) {
+      prop = this.parseSpread();
+      prop.type = isPattern ? "RestProperty" : "SpreadProperty";
+      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.types.braceR)) {
+          break;
+        } else if (this.match(_types.types.comma) && this.lookahead().type === _types.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.types.star);
+    }
+
+    if (!isPattern && this.isContextual("async")) {
+      if (isGenerator) this.unexpected();
+
+      var asyncId = this.parseIdentifier();
+      if (this.match(_types.types.colon) || this.match(_types.types.parenL) || this.match(_types.types.braceR)) {
+        prop.key = asyncId;
+      } else {
+        isAsync = true;
+        if (this.hasPlugin("asyncGenerators")) isGenerator = this.eat(_types.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.parseObjPropValue = function (prop, startPos, startLoc, isGenerator, isAsync, isPattern, refShorthandDefaultPos) {
+  if (isAsync || isGenerator || this.match(_types.types.parenL)) {
+    if (isPattern) this.unexpected();
+    prop.kind = "method";
+    prop.method = true;
+    this.parseMethod(prop, isGenerator, isAsync);
+    return this.finishNode(prop, "ObjectMethod");
+  }
+
+  if (this.eat(_types.types.colon)) {
+    prop.value = isPattern ? this.parseMaybeDefault(this.state.start, this.state.startLoc) : this.parseMaybeAssign(false, refShorthandDefaultPos);
+    return this.finishNode(prop, "ObjectProperty");
+  }
+
+  if (!isPattern && !prop.computed && prop.key.type === "Identifier" && (prop.key.name === "get" || prop.key.name === "set") && !this.match(_types.types.comma) && !this.match(_types.types.braceR)) {
+    if (isGenerator || isAsync) this.unexpected();
+    prop.kind = prop.key.name;
+    this.parsePropertyName(prop);
+    this.parseMethod(prop, false);
+    var paramCount = prop.kind === "get" ? 0 : 1;
+    if (prop.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");
+      }
+    }
+    return this.finishNode(prop, "ObjectMethod");
+  }
+
+  if (!prop.computed && prop.key.type === "Identifier") {
+    if (isPattern) {
+      var illegalBinding = this.isKeyword(prop.key.name);
+      if (!illegalBinding && this.state.strict) {
+        illegalBinding = _identifier.reservedWords.strictBind(prop.key.name) || _identifier.reservedWords.strict(prop.key.name);
+      }
+      if (illegalBinding) {
+        this.raise(prop.key.start, "Binding " + prop.key.name);
+      }
+      prop.value = this.parseMaybeDefault(startPos, startLoc, prop.key.__clone());
+    } else if (this.match(_types.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");
+  }
+
+  this.unexpected();
+};
+
+pp.parsePropertyName = function (prop) {
+  if (this.eat(_types.types.bracketL)) {
+    prop.computed = true;
+    prop.key = this.parseMaybeAssign();
+    this.expect(_types.types.bracketR);
+    return prop.key;
+  } else {
+    prop.computed = false;
+    return prop.key = this.match(_types.types.num) || this.match(_types.types.string) ? this.parseExprAtom() : this.parseIdentifier(true);
+  }
+};
+
+// Initialize empty function node.
+
+pp.initFunction = function (node, isAsync) {
+  node.id = null;
+  node.generator = false;
+  node.expression = false;
+  node.async = !!isAsync;
+};
+
+// Parse object or class method.
+
+pp.parseMethod = function (node, isGenerator, isAsync) {
+  var oldInMethod = this.state.inMethod;
+  this.state.inMethod = node.kind || true;
+  this.initFunction(node, isAsync);
+  this.expect(_types.types.parenL);
+  node.params = this.parseBindingList(_types.types.parenR);
+  node.generator = isGenerator;
+  this.parseFunctionBody(node);
+  this.state.inMethod = oldInMethod;
+  return node;
+};
+
+// Parse arrow function expression with given parameters.
+
+pp.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");
+};
+
+// Parse function body and check parameters.
+
+pp.parseFunctionBody = function (node, allowExpression) {
+  var isExpression = allowExpression && !this.match(_types.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,
+        oldInGen = this.state.inGenerator,
+        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 checkLVal = this.state.strict;
+  var isStrict = false;
+
+  // arrow function
+  if (allowExpression) checkLVal = true;
+
+  // normal function
+  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") {
+        isStrict = true;
+        checkLVal = true;
+        break;
+      }
+    }
+  }
+
+  //
+  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.parseExprList = function (close, allowEmpty, refShorthandDefaultPos) {
+  var elts = [],
+      first = true;
+  while (!this.eat(close)) {
+    if (first) {
+      first = false;
+    } else {
+      this.expect(_types.types.comma);
+      if (this.eat(close)) break;
+    }
+
+    elts.push(this.parseExprListItem(allowEmpty, refShorthandDefaultPos));
+  }
+  return elts;
+};
+
+pp.parseExprListItem = function (allowEmpty, refShorthandDefaultPos) {
+  var elt = void 0;
+  if (allowEmpty && this.match(_types.types.comma)) {
+    elt = null;
+  } else if (this.match(_types.types.ellipsis)) {
+    elt = this.parseSpread(refShorthandDefaultPos);
+  } else {
+    elt = this.parseMaybeAssign(false, refShorthandDefaultPos, this.parseParenItem);
+  }
+  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.parseIdentifier = function (liberal) {
+  var node = this.startNode();
+
+  if (this.match(_types.types.name)) {
+    if (!liberal && this.state.strict && _identifier.reservedWords.strict(this.state.value)) {
+      this.raise(this.state.start, "The keyword '" + this.state.value + "' is reserved");
+    }
+
+    node.name = this.state.value;
+  } else if (liberal && 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");
+};
+
+// Parses await expression inside async function.
+
+pp.parseAwait = function (node) {
+  if (!this.state.inAsync) {
+    this.unexpected();
+  }
+  if (this.match(_types.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.parseYield = function () {
+  var node = this.startNode();
+  this.next();
+  if (this.match(_types.types.semi) || this.canInsertSemicolon() || !this.match(_types.types.star) && !this.state.type.startsExpr) {
+    node.delegate = false;
+    node.argument = null;
+  } else {
+    node.delegate = this.eat(_types.types.star);
+    node.argument = this.parseMaybeAssign();
+  }
+  return this.finishNode(node, "YieldExpression");
+};
\ No newline at end of file
diff --git a/node_modules/babylon/lib/parser/index.js b/node_modules/babylon/lib/parser/index.js
new file mode 100644
index 000000000..e8398929d
--- /dev/null
+++ b/node_modules/babylon/lib/parser/index.js
@@ -0,0 +1,102 @@
+"use strict";
+
+exports.__esModule = true;
+exports.plugins = undefined;
+
+var _identifier = require("../util/identifier");
+
+var _options = require("../options");
+
+var _tokenizer = require("../tokenizer");
+
+var _tokenizer2 = _interopRequireDefault(_tokenizer);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }
+
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }
+
+var plugins = exports.plugins = {};
+
+var Parser = function (_Tokenizer) {
+  _inherits(Parser, _Tokenizer);
+
+  function Parser(options, input) {
+    _classCallCheck(this, Parser);
+
+    options = (0, _options.getOptions)(options);
+
+    var _this = _possibleConstructorReturn(this, _Tokenizer.call(this, options, input));
+
+    _this.options = options;
+    _this.inModule = _this.options.sourceType === "module";
+    _this.isReservedWord = _identifier.reservedWords[6];
+    _this.input = input;
+    _this.plugins = _this.loadPlugins(_this.options.plugins);
+    _this.filename = options.sourceFilename;
+
+    // If enabled, skip leading hashbang line.
+    if (_this.state.pos === 0 && _this.input[0] === "#" && _this.input[1] === "!") {
+      _this.skipLineComment(2);
+    }
+    return _this;
+  }
+
+  Parser.prototype.hasPlugin = function hasPlugin(name) {
+    return !!(this.plugins["*"] || this.plugins[name]);
+  };
+
+  Parser.prototype.extend = function extend(name, f) {
+    this[name] = f(this[name]);
+  };
+
+  Parser.prototype.loadPlugins = function loadPlugins(plugins) {
+    var pluginMap = {};
+
+    if (plugins.indexOf("flow") >= 0) {
+      // ensure flow plugin loads last
+      plugins = plugins.filter(function (plugin) {
+        return plugin !== "flow";
+      });
+      plugins.push("flow");
+    }
+
+    for (var _iterator = plugins, _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 name = _ref;
+
+      if (!pluginMap[name]) {
+        pluginMap[name] = true;
+
+        var plugin = exports.plugins[name];
+        if (plugin) plugin(this);
+      }
+    }
+
+    return pluginMap;
+  };
+
+  Parser.prototype.parse = function parse() {
+    var file = this.startNode();
+    var program = this.startNode();
+    this.nextToken();
+    return this.parseTopLevel(file, program);
+  };
+
+  return Parser;
+}(_tokenizer2.default);
+
+exports.default = Parser;
\ No newline at end of file
diff --git a/node_modules/babylon/lib/parser/location.js b/node_modules/babylon/lib/parser/location.js
new file mode 100644
index 000000000..61a9a27cc
--- /dev/null
+++ b/node_modules/babylon/lib/parser/location.js
@@ -0,0 +1,26 @@
+"use strict";
+
+var _location = require("../util/location");
+
+var _index = require("./index");
+
+var _index2 = _interopRequireDefault(_index);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+var pp = _index2.default.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.raise = function (pos, message) {
+  var loc = (0, _location.getLineInfo)(this.input, pos);
+  message += " (" + loc.line + ":" + loc.column + ")";
+  var err = new SyntaxError(message);
+  err.pos = pos;
+  err.loc = loc;
+  throw err;
+};
\ No newline at end of file
diff --git a/node_modules/babylon/lib/parser/lval.js b/node_modules/babylon/lib/parser/lval.js
new file mode 100644
index 000000000..1bdbfa1f0
--- /dev/null
+++ b/node_modules/babylon/lib/parser/lval.js
@@ -0,0 +1,315 @@
+"use strict";
+
+var _types = require("../tokenizer/types");
+
+var _index = require("./index");
+
+var _index2 = _interopRequireDefault(_index);
+
+var _identifier = require("../util/identifier");
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+var pp = _index2.default.prototype;
+
+// Convert existing expression atom to assignable pattern
+// if possible.
+
+/* eslint indent: 0 */
+
+pp.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";
+        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.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.toReferencedList = function (exprList) {
+  return exprList;
+};
+
+// Parses spread element.
+
+pp.parseSpread = function (refShorthandDefaultPos) {
+  var node = this.startNode();
+  this.next();
+  node.argument = this.parseMaybeAssign(false, refShorthandDefaultPos);
+  return this.finishNode(node, "SpreadElement");
+};
+
+pp.parseRest = function () {
+  var node = this.startNode();
+  this.next();
+  node.argument = this.parseBindingIdentifier();
+  return this.finishNode(node, "RestElement");
+};
+
+pp.shouldAllowYieldIdentifier = function () {
+  return this.match(_types.types._yield) && !this.state.strict && !this.state.inGenerator;
+};
+
+pp.parseBindingIdentifier = function () {
+  return this.parseIdentifier(this.shouldAllowYieldIdentifier());
+};
+
+// Parses lvalue (assignable) atom.
+
+pp.parseBindingAtom = function () {
+  switch (this.state.type) {
+    case _types.types._yield:
+      if (this.state.strict || this.state.inGenerator) this.unexpected();
+    // fall-through
+    case _types.types.name:
+      return this.parseIdentifier(true);
+
+    case _types.types.bracketL:
+      var node = this.startNode();
+      this.next();
+      node.elements = this.parseBindingList(_types.types.bracketR, true);
+      return this.finishNode(node, "ArrayPattern");
+
+    case _types.types.braceL:
+      return this.parseObj(true);
+
+    default:
+      this.unexpected();
+  }
+};
+
+pp.parseBindingList = function (close, allowEmpty) {
+  var elts = [];
+  var first = true;
+  while (!this.eat(close)) {
+    if (first) {
+      first = false;
+    } else {
+      this.expect(_types.types.comma);
+    }
+    if (allowEmpty && this.match(_types.types.comma)) {
+      elts.push(null);
+    } else if (this.eat(close)) {
+      break;
+    } else if (this.match(_types.types.ellipsis)) {
+      elts.push(this.parseAssignableListItemTypes(this.parseRest()));
+      this.expect(close);
+      break;
+    } else {
+      var decorators = [];
+      while (this.match(_types.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.parseAssignableListItemTypes = function (param) {
+  return param;
+};
+
+// Parses assignment pattern around given atom if possible.
+
+pp.parseMaybeDefault = function (startPos, startLoc, left) {
+  startLoc = startLoc || this.state.startLoc;
+  startPos = startPos || this.state.start;
+  left = left || this.parseBindingAtom();
+  if (!this.eat(_types.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.checkLVal = function (expr, isBinding, checkClashes, contextDescription) {
+  switch (expr.type) {
+    case "Identifier":
+      if (this.state.strict && (_identifier.reservedWords.strictBind(expr.name) || _identifier.reservedWords.strict(expr.name))) {
+        this.raise(expr.start, (isBinding ? "Binding " : "Assigning to ") + expr.name + " in strict mode");
+      }
+
+      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);
+      }
+  }
+};
\ No newline at end of file
diff --git a/node_modules/babylon/lib/parser/node.js b/node_modules/babylon/lib/parser/node.js
new file mode 100644
index 000000000..a9bbe4e53
--- /dev/null
+++ b/node_modules/babylon/lib/parser/node.js
@@ -0,0 +1,70 @@
+"use strict";
+
+var _index = require("./index");
+
+var _index2 = _interopRequireDefault(_index);
+
+var _location = require("../util/location");
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+// Start an AST node, attaching a start offset.
+
+var pp = _index2.default.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 _location.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.startNode = function () {
+  return new Node(this.state.start, this.state.startLoc, this.filename);
+};
+
+pp.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.finishNode = function (node, type) {
+  return finishNodeAt.call(this, node, type, this.state.lastTokEnd, this.state.lastTokEndLoc);
+};
+
+// Finish node at given position
+
+pp.finishNodeAt = function (node, type, pos, loc) {
+  return finishNodeAt.call(this, node, type, pos, loc);
+};
\ No newline at end of file
diff --git a/node_modules/babylon/lib/parser/statement.js b/node_modules/babylon/lib/parser/statement.js
new file mode 100644
index 000000000..3aa2f7882
--- /dev/null
+++ b/node_modules/babylon/lib/parser/statement.js
@@ -0,0 +1,1107 @@
+"use strict";
+
+var _types = require("../tokenizer/types");
+
+var _index = require("./index");
+
+var _index2 = _interopRequireDefault(_index);
+
+var _whitespace = require("../util/whitespace");
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+var pp = _index2.default.prototype;
+
+// ### Statement parsing
+
+// Parse a program. Initializes the parser, reads any number of
+// statements, and wraps them in a Program node.  Optionally takes a
+// `program` argument.  If present, the statements will be appended
+// to its body instead of creating a new node.
+
+/* eslint indent: 0 */
+/* eslint max-len: 0 */
+
+pp.parseTopLevel = function (file, program) {
+  program.sourceType = this.options.sourceType;
+
+  this.parseBlockBody(program, true, true, _types.types.eof);
+
+  file.program = this.finishNode(program, "Program");
+  file.comments = this.state.comments;
+  file.tokens = this.state.tokens;
+
+  return this.finishNode(file, "File");
+};
+
+var loopLabel = { kind: "loop" },
+    switchLabel = { kind: "switch" };
+
+// TODO
+
+pp.stmtToDirective = function (stmt) {
+  var expr = stmt.expression;
+
+  var directiveLiteral = this.startNodeAt(expr.start, expr.loc.start);
+  var directive = this.startNodeAt(stmt.start, stmt.loc.start);
+
+  var raw = this.input.slice(expr.start, expr.end);
+  var val = directiveLiteral.value = raw.slice(1, -1); // remove quotes
+
+  this.addExtra(directiveLiteral, "raw", raw);
+  this.addExtra(directiveLiteral, "rawValue", val);
+
+  directive.value = this.finishNodeAt(directiveLiteral, "DirectiveLiteral", expr.end, expr.loc.end);
+
+  return this.finishNodeAt(directive, "Directive", stmt.end, stmt.loc.end);
+};
+
+// Parse a single statement.
+//
+// If expecting a statement and finding a slash operator, parse a
+// regular expression literal. This is to handle cases like
+// `if (foo) /blah/.exec(foo)`, where looking at the previous token
+// does not help.
+
+pp.parseStatement = function (declaration, topLevel) {
+  if (this.match(_types.types.at)) {
+    this.parseDecorators(true);
+  }
+
+  var starttype = this.state.type,
+      node = this.startNode();
+
+  // Most types of statements are recognized by the keyword they
+  // start with. Many are trivial to parse, some require a bit of
+  // complexity.
+
+  switch (starttype) {
+    case _types.types._break:case _types.types._continue:
+      return this.parseBreakContinueStatement(node, starttype.keyword);
+    case _types.types._debugger:
+      return this.parseDebuggerStatement(node);
+    case _types.types._do:
+      return this.parseDoStatement(node);
+    case _types.types._for:
+      return this.parseForStatement(node);
+    case _types.types._function:
+      if (!declaration) this.unexpected();
+      return this.parseFunctionStatement(node);
+
+    case _types.types._class:
+      if (!declaration) this.unexpected();
+      this.takeDecorators(node);
+      return this.parseClass(node, true);
+
+    case _types.types._if:
+      return this.parseIfStatement(node);
+    case _types.types._return:
+      return this.parseReturnStatement(node);
+    case _types.types._switch:
+      return this.parseSwitchStatement(node);
+    case _types.types._throw:
+      return this.parseThrowStatement(node);
+    case _types.types._try:
+      return this.parseTryStatement(node);
+
+    case _types.types._let:
+    case _types.types._const:
+      if (!declaration) this.unexpected(); // NOTE: falls through to _var
+
+    case _types.types._var:
+      return this.parseVarStatement(node, starttype);
+
+    case _types.types._while:
+      return this.parseWhileStatement(node);
+    case _types.types._with:
+      return this.parseWithStatement(node);
+    case _types.types.braceL:
+      return this.parseBlock();
+    case _types.types.semi:
+      return this.parseEmptyStatement(node);
+    case _types.types._export:
+    case _types.types._import:
+      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.types._import ? this.parseImport(node) : this.parseExport(node);
+
+    case _types.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.types._function) && !this.canInsertSemicolon()) {
+          this.expect(_types.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.types.name && expr.type === "Identifier" && this.eat(_types.types.colon)) {
+    return this.parseLabeledStatement(node, maybeName, expr);
+  } else {
+    return this.parseExpressionStatement(node, expr);
+  }
+};
+
+pp.takeDecorators = function (node) {
+  if (this.state.decorators.length) {
+    node.decorators = this.state.decorators;
+    this.state.decorators = [];
+  }
+};
+
+pp.parseDecorators = function (allowExport) {
+  while (this.match(_types.types.at)) {
+    this.state.decorators.push(this.parseDecorator());
+  }
+
+  if (allowExport && this.match(_types.types._export)) {
+    return;
+  }
+
+  if (!this.match(_types.types._class)) {
+    this.raise(this.state.start, "Leading decorators must be attached to a class declaration");
+  }
+};
+
+pp.parseDecorator = function () {
+  if (!this.hasPlugin("decorators")) {
+    this.unexpected();
+  }
+  var node = this.startNode();
+  this.next();
+  node.expression = this.parseMaybeAssign();
+  return this.finishNode(node, "Decorator");
+};
+
+pp.parseBreakContinueStatement = function (node, keyword) {
+  var isBreak = keyword === "break";
+  this.next();
+
+  if (this.isLineTerminator()) {
+    node.label = null;
+  } else if (!this.match(_types.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.parseDebuggerStatement = function (node) {
+  this.next();
+  this.semicolon();
+  return this.finishNode(node, "DebuggerStatement");
+};
+
+pp.parseDoStatement = function (node) {
+  this.next();
+  this.state.labels.push(loopLabel);
+  node.body = this.parseStatement(false);
+  this.state.labels.pop();
+  this.expect(_types.types._while);
+  node.test = this.parseParenExpression();
+  this.eat(_types.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.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.types.parenL);
+
+  if (this.match(_types.types.semi)) {
+    if (forAwait) {
+      this.unexpected();
+    }
+    return this.parseFor(node, null);
+  }
+
+  if (this.match(_types.types._var) || this.match(_types.types._let) || this.match(_types.types._const)) {
+    var _init = this.startNode(),
+        varKind = this.state.type;
+    this.next();
+    this.parseVar(_init, true, varKind);
+    this.finishNode(_init, "VariableDeclaration");
+
+    if (this.match(_types.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.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.parseFunctionStatement = function (node) {
+  this.next();
+  return this.parseFunction(node, true);
+};
+
+pp.parseIfStatement = function (node) {
+  this.next();
+  node.test = this.parseParenExpression();
+  node.consequent = this.parseStatement(false);
+  node.alternate = this.eat(_types.types._else) ? this.parseStatement(false) : null;
+  return this.finishNode(node, "IfStatement");
+};
+
+pp.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.parseSwitchStatement = function (node) {
+  this.next();
+  node.discriminant = this.parseParenExpression();
+  node.cases = [];
+  this.expect(_types.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.types.braceR);) {
+    if (this.match(_types.types._case) || this.match(_types.types._default)) {
+      var isCase = this.match(_types.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.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.parseThrowStatement = function (node) {
+  this.next();
+  if (_whitespace.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.parseTryStatement = function (node) {
+  this.next();
+
+  node.block = this.parseBlock();
+  node.handler = null;
+
+  if (this.match(_types.types._catch)) {
+    var clause = this.startNode();
+    this.next();
+
+    this.expect(_types.types.parenL);
+    clause.param = this.parseBindingAtom();
+    this.checkLVal(clause.param, true, Object.create(null), "catch clause");
+    this.expect(_types.types.parenR);
+
+    clause.body = this.parseBlock();
+    node.handler = this.finishNode(clause, "CatchClause");
+  }
+
+  node.guardedHandlers = empty;
+  node.finalizer = this.eat(_types.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.parseVarStatement = function (node, kind) {
+  this.next();
+  this.parseVar(node, false, kind);
+  this.semicolon();
+  return this.finishNode(node, "VariableDeclaration");
+};
+
+pp.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.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.parseEmptyStatement = function (node) {
+  this.next();
+  return this.finishNode(node, "EmptyStatement");
+};
+
+pp.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.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.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.parseBlock = function (allowDirectives) {
+  var node = this.startNode();
+  this.expect(_types.types.braceL);
+  this.parseBlockBody(node, allowDirectives, false, _types.types.braceR);
+  return this.finishNode(node, "BlockStatement");
+};
+
+// TODO
+
+pp.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 && stmt.type === "ExpressionStatement" && stmt.expression.type === "StringLiteral" && !stmt.expression.extra.parenthesized) {
+      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.parseFor = function (node, init) {
+  node.init = init;
+  this.expect(_types.types.semi);
+  node.test = this.match(_types.types.semi) ? null : this.parseExpression();
+  this.expect(_types.types.semi);
+  node.update = this.match(_types.types.parenR) ? null : this.parseExpression();
+  this.expect(_types.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.parseForIn = function (node, init, forAwait) {
+  var type = void 0;
+  if (forAwait) {
+    this.eatContextual("of");
+    type = "ForAwaitStatement";
+  } else {
+    type = this.match(_types.types._in) ? "ForInStatement" : "ForOfStatement";
+    this.next();
+  }
+  node.left = init;
+  node.right = this.parseExpression();
+  this.expect(_types.types.parenR);
+  node.body = this.parseStatement(false);
+  this.state.labels.pop();
+  return this.finishNode(node, type);
+};
+
+// Parse a list of variable declarations.
+
+pp.parseVar = function (node, isFor, kind) {
+  node.declarations = [];
+  node.kind = kind.keyword;
+  for (;;) {
+    var decl = this.startNode();
+    this.parseVarHead(decl);
+    if (this.eat(_types.types.eq)) {
+      decl.init = this.parseMaybeAssign(isFor);
+    } else if (kind === _types.types._const && !(this.match(_types.types._in) || this.isContextual("of"))) {
+      this.unexpected();
+    } else if (decl.id.type !== "Identifier" && !(isFor && (this.match(_types.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.types.comma)) break;
+  }
+  return node;
+};
+
+pp.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.parseFunction = function (node, isStatement, allowExpressionBody, isAsync, optionalId) {
+  var oldInMethod = this.state.inMethod;
+  this.state.inMethod = false;
+
+  this.initFunction(node, isAsync);
+
+  if (this.match(_types.types.star)) {
+    if (node.async && !this.hasPlugin("asyncGenerators")) {
+      this.unexpected();
+    } else {
+      node.generator = true;
+      this.next();
+    }
+  }
+
+  if (isStatement && !optionalId && !this.match(_types.types.name) && !this.match(_types.types._yield)) {
+    this.unexpected();
+  }
+
+  if (this.match(_types.types.name) || this.match(_types.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.parseFunctionParams = function (node) {
+  this.expect(_types.types.parenL);
+  node.params = this.parseBindingList(_types.types.parenR);
+};
+
+// Parse a class declaration or literal (depending on the
+// `isStatement` parameter).
+
+pp.parseClass = function (node, isStatement, optionalId) {
+  this.next();
+  this.parseClassId(node, isStatement, optionalId);
+  this.parseClassSuper(node);
+  this.parseClassBody(node);
+  return this.finishNode(node, isStatement ? "ClassDeclaration" : "ClassExpression");
+};
+
+pp.isClassProperty = function () {
+  return this.match(_types.types.eq) || this.isLineTerminator();
+};
+
+pp.isClassMutatorStarter = function () {
+  return false;
+};
+
+pp.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.types.braceL);
+
+  while (!this.eat(_types.types.braceR)) {
+    if (this.eat(_types.types.semi)) {
+      continue;
+    }
+
+    if (this.match(_types.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 = [];
+    }
+
+    var isConstructorCall = false;
+    var isMaybeStatic = this.match(_types.types.name) && this.state.value === "static";
+    var isGenerator = this.eat(_types.types.star);
+    var isGetSet = false;
+    var isAsync = false;
+
+    this.parsePropertyName(method);
+
+    method.static = isMaybeStatic && !this.match(_types.types.parenL);
+    if (method.static) {
+      if (isGenerator) this.unexpected();
+      isGenerator = this.eat(_types.types.star);
+      this.parsePropertyName(method);
+    }
+
+    if (!isGenerator) {
+      if (this.isClassProperty()) {
+        classBody.body.push(this.parseClassProperty(method));
+        continue;
+      }
+
+      if (method.key.type === "Identifier" && !method.computed && this.hasPlugin("classConstructorCall") && method.key.name === "call" && this.match(_types.types.name) && this.state.value === "constructor") {
+        isConstructorCall = true;
+        this.parsePropertyName(method);
+      }
+    }
+
+    var isAsyncMethod = !this.match(_types.types.parenL) && !method.computed && method.key.type === "Identifier" && method.key.name === "async";
+    if (isAsyncMethod) {
+      if (this.hasPlugin("asyncGenerators") && this.eat(_types.types.star)) isGenerator = true;
+      isAsync = true;
+      this.parsePropertyName(method);
+    }
+
+    method.kind = "method";
+
+    if (!method.computed) {
+      var key = method.key;
+
+      // handle get/set methods
+      // eg. class Foo { get bar() {} set bar() {} }
+
+      if (!isAsync && !isGenerator && !this.isClassMutatorStarter() && key.type === "Identifier" && !this.match(_types.types.parenL) && (key.name === "get" || key.name === "set")) {
+        isGetSet = true;
+        method.kind = key.name;
+        key = this.parsePropertyName(method);
+      }
+
+      // disallow invalid constructors
+      var isConstructor = !isConstructorCall && !method.static && (key.type === "Identifier" && key.name === "constructor" || key.type === "StringLiteral" && key.value === "constructor");
+      if (isConstructor) {
+        if (hadConstructor) this.raise(key.start, "Duplicate constructor in the same class");
+        if (isGetSet) this.raise(key.start, "Constructor can't have get/set modifier");
+        if (isGenerator) this.raise(key.start, "Constructor can't be a generator");
+        if (isAsync) this.raise(key.start, "Constructor can't be an async function");
+        method.kind = "constructor";
+        hadConstructor = true;
+      }
+
+      // disallow static prototype method
+      var isStaticPrototype = method.static && (key.type === "Identifier" && key.name === "prototype" || key.type === "StringLiteral" && key.value === "prototype");
+      if (isStaticPrototype) {
+        this.raise(key.start, "Classes may not have static property named prototype");
+      }
+    }
+
+    // convert constructor to a constructor call
+    if (isConstructorCall) {
+      if (hadConstructorCall) this.raise(method.start, "Duplicate constructor call in the same class");
+      method.kind = "constructorCall";
+      hadConstructorCall = true;
+    }
+
+    // disallow decorators on class constructors
+    if ((method.kind === "constructor" || method.kind === "constructorCall") && method.decorators) {
+      this.raise(method.start, "You can't attach decorators to a class constructor");
+    }
+
+    this.parseClassMethod(classBody, method, isGenerator, isAsync);
+
+    // get methods aren't allowed to have any parameters
+    // set methods must have exactly 1 parameter
+    if (isGetSet) {
+      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");
+        }
+      }
+    }
+  }
+
+  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.parseClassProperty = function (node) {
+  if (this.match(_types.types.eq)) {
+    if (!this.hasPlugin("classProperties")) this.unexpected();
+    this.next();
+    node.value = this.parseMaybeAssign();
+  } else {
+    node.value = null;
+  }
+  this.semicolon();
+  return this.finishNode(node, "ClassProperty");
+};
+
+pp.parseClassMethod = function (classBody, method, isGenerator, isAsync) {
+  this.parseMethod(method, isGenerator, isAsync);
+  classBody.body.push(this.finishNode(method, "ClassMethod"));
+};
+
+pp.parseClassId = function (node, isStatement, optionalId) {
+  if (this.match(_types.types.name)) {
+    node.id = this.parseIdentifier();
+  } else {
+    if (optionalId || !isStatement) {
+      node.id = null;
+    } else {
+      this.unexpected();
+    }
+  }
+};
+
+pp.parseClassSuper = function (node) {
+  node.superClass = this.eat(_types.types._extends) ? this.parseExprSubscripts() : null;
+};
+
+// Parses module export declaration.
+
+pp.parseExport = function (node) {
+  this.next();
+  // export * from '...'
+  if (this.match(_types.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.types.comma) && this.lookahead().type === _types.types.star) {
+      this.expect(_types.types.comma);
+      var _specifier2 = this.startNode();
+      this.expect(_types.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.types._default)) {
+    // export default ...
+    var expr = this.startNode();
+    var needsSemi = false;
+    if (this.eat(_types.types._function)) {
+      expr = this.parseFunction(expr, true, false, false, true);
+    } else if (this.match(_types.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.state.type.keyword || 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.parseExportDeclaration = function () {
+  return this.parseStatement(true);
+};
+
+pp.isExportDefaultSpecifier = function () {
+  if (this.match(_types.types.name)) {
+    return this.state.value !== "type" && this.state.value !== "async" && this.state.value !== "interface";
+  }
+
+  if (!this.match(_types.types._default)) {
+    return false;
+  }
+
+  var lookahead = this.lookahead();
+  return lookahead.type === _types.types.comma || lookahead.type === _types.types.name && lookahead.value === "from";
+};
+
+pp.parseExportSpecifiersMaybe = function (node) {
+  if (this.eat(_types.types.comma)) {
+    node.specifiers = node.specifiers.concat(this.parseExportSpecifiers());
+  }
+};
+
+pp.parseExportFrom = function (node, expect) {
+  if (this.eatContextual("from")) {
+    node.source = this.match(_types.types.string) ? this.parseExprAtom() : this.unexpected();
+    this.checkExport(node);
+  } else {
+    if (expect) {
+      this.unexpected();
+    } else {
+      node.source = null;
+    }
+  }
+
+  this.semicolon();
+};
+
+pp.shouldParseExportDeclaration = function () {
+  return this.isContextual("async");
+};
+
+pp.checkExport = function (node, checkNames, isDefault) {
+  if (checkNames) {
+    // Check for duplicate exports
+    if (isDefault) {
+      // Default exports
+      this.checkDuplicateExports(node, "default", isDefault);
+    } 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;
+
+        var name = specifier.exported.name;
+        if (name === "default") isDefault = true;
+        this.checkDuplicateExports(specifier, name, isDefault);
+      }
+    } else if (node.declaration) {
+      // Exported declarations
+      if (node.declaration.type === "FunctionDeclaration" || node.declaration.type === "ClassDeclaration") {
+        this.checkDuplicateExports(node, node.declaration.id.name, isDefault);
+      } 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;
+
+          if (declaration.id.name) {
+            this.checkDuplicateExports(declaration, declaration.id.name, isDefault);
+          }
+        }
+      }
+    }
+  }
+
+  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.checkDuplicateExports = function (node, name, isDefault) {
+  if (this.state.exportedIdentifiers.indexOf(name) > -1) {
+    this.raiseDuplicateExportError(node, name, isDefault);
+  }
+  this.state.exportedIdentifiers.push(name);
+};
+
+pp.raiseDuplicateExportError = function (node, name, isDefault) {
+  this.raise(node.start, isDefault ? "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.parseExportSpecifiers = function () {
+  var nodes = [];
+  var first = true;
+  var needsFrom = void 0;
+
+  // export { x, y as z } [from '...']
+  this.expect(_types.types.braceL);
+
+  while (!this.eat(_types.types.braceR)) {
+    if (first) {
+      first = false;
+    } else {
+      this.expect(_types.types.comma);
+      if (this.eat(_types.types.braceR)) break;
+    }
+
+    var isDefault = this.match(_types.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.parseImport = function (node) {
+  this.next();
+
+  // import '...'
+  if (this.match(_types.types.string)) {
+    node.specifiers = [];
+    node.source = this.parseExprAtom();
+  } else {
+    node.specifiers = [];
+    this.parseImportSpecifiers(node);
+    this.expectContextual("from");
+    node.source = this.match(_types.types.string) ? this.parseExprAtom() : this.unexpected();
+  }
+  this.semicolon();
+  return this.finishNode(node, "ImportDeclaration");
+};
+
+// Parses a comma-separated list of module imports.
+
+pp.parseImportSpecifiers = function (node) {
+  var first = true;
+  if (this.match(_types.types.name)) {
+    // import defaultObj, { x, y as z } from '...'
+    var startPos = this.state.start,
+        startLoc = this.state.startLoc;
+    node.specifiers.push(this.parseImportSpecifierDefault(this.parseIdentifier(), startPos, startLoc));
+    if (!this.eat(_types.types.comma)) return;
+  }
+
+  if (this.match(_types.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.types.braceL);
+  while (!this.eat(_types.types.braceR)) {
+    if (first) {
+      first = false;
+    } else {
+      this.expect(_types.types.comma);
+      if (this.eat(_types.types.braceR)) break;
+    }
+
+    var _specifier3 = this.startNode();
+    _specifier3.imported = this.parseIdentifier(true);
+    _specifier3.local = this.eatContextual("as") ? this.parseIdentifier() : _specifier3.imported.__clone();
+    this.checkLVal(_specifier3.local, true, undefined, "import specifier");
+    node.specifiers.push(this.finishNode(_specifier3, "ImportSpecifier"));
+  }
+};
+
+pp.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");
+};
\ No newline at end of file
diff --git a/node_modules/babylon/lib/parser/util.js b/node_modules/babylon/lib/parser/util.js
new file mode 100644
index 000000000..f092721a4
--- /dev/null
+++ b/node_modules/babylon/lib/parser/util.js
@@ -0,0 +1,92 @@
+"use strict";
+
+var _types = require("../tokenizer/types");
+
+var _index = require("./index");
+
+var _index2 = _interopRequireDefault(_index);
+
+var _whitespace = require("../util/whitespace");
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+var pp = _index2.default.prototype;
+
+// ## Parser utilities
+
+// TODO
+
+pp.addExtra = function (node, key, val) {
+  if (!node) return;
+
+  var extra = node.extra = node.extra || {};
+  extra[key] = val;
+};
+
+// TODO
+
+pp.isRelational = function (op) {
+  return this.match(_types.types.relational) && this.state.value === op;
+};
+
+// TODO
+
+pp.expectRelational = function (op) {
+  if (this.isRelational(op)) {
+    this.next();
+  } else {
+    this.unexpected();
+  }
+};
+
+// Tests whether parsed token is a contextual keyword.
+
+pp.isContextual = function (name) {
+  return this.match(_types.types.name) && this.state.value === name;
+};
+
+// Consumes contextual keyword if possible.
+
+pp.eatContextual = function (name) {
+  return this.state.value === name && this.eat(_types.types.name);
+};
+
+// Asserts that following token is given contextual keyword.
+
+pp.expectContextual = function (name, message) {
+  if (!this.eatContextual(name)) this.unexpected(null, message);
+};
+
+// Test whether a semicolon can be inserted at the current position.
+
+pp.canInsertSemicolon = function () {
+  return this.match(_types.types.eof) || this.match(_types.types.braceR) || _whitespace.lineBreak.test(this.input.slice(this.state.lastTokEnd, this.state.start));
+};
+
+// TODO
+
+pp.isLineTerminator = function () {
+  return this.eat(_types.types.semi) || this.canInsertSemicolon();
+};
+
+// Consume a semicolon, or, failing that, see if we are allowed to
+// pretend that there is a semicolon at this position.
+
+pp.semicolon = function () {
+  if (!this.isLineTerminator()) this.unexpected();
+};
+
+// Expect a token of a given type. If found, consume it, otherwise,
+// raise an unexpected token error at given pos.
+
+pp.expect = function (type, pos) {
+  return this.eat(type) || this.unexpected(pos);
+};
+
+// Raise an unexpected token error.
+
+pp.unexpected = function (pos) {
+  var message = arguments.length <= 1 || arguments[1] === undefined ? "Unexpected token" : arguments[1];
+
+  this.raise(pos != null ? pos : this.state.start, message);
+};
\ No newline at end of file