DevTools: produce javascript outline for javascript classess

third_party/WebKit/Source/devtools/front_end/acorn/acorn_loose.js

Index: third_party/WebKit/Source/devtools/front_end/acorn/acorn_loose.js
diff --git a/third_party/WebKit/Source/devtools/front_end/acorn/acorn_loose.js b/third_party/WebKit/Source/devtools/front_end/acorn/acorn_loose.js
new file mode 100644
index 0000000000000000000000000000000000000000..6f372dab3d9944e8f11036dfd2b3de87ecf29660
--- /dev/null
+++ b/third_party/WebKit/Source/devtools/front_end/acorn/acorn_loose.js
@@ -0,0 +1,1378 @@
+// clang-format off
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('./acorn')) :
+  typeof define === 'function' && define.amd ? define(['exports', './acorn'], factory) :
+  (factory((global.acorn = global.acorn || {}, global.acorn.loose = global.acorn.loose || {}),global.acorn));
+}(this, (function (exports,__acorn) { 'use strict';
+
+// Registered plugins
+var pluginsLoose = {}
+
+var LooseParser = function LooseParser(input, options) {
+  if ( options === void 0 ) options = {};
+
+  this.toks = __acorn.tokenizer(input, options)
+  this.options = this.toks.options
+  this.input = this.toks.input
+  this.tok = this.last = {type: __acorn.tokTypes.eof, start: 0, end: 0}
+  if (this.options.locations) {
+    var here = this.toks.curPosition()
+    this.tok.loc = new __acorn.SourceLocation(this.toks, here, here)
+  }
+  this.ahead = [] // Tokens ahead
+  this.context = [] // Indentation contexted
+  this.curIndent = 0
+  this.curLineStart = 0
+  this.nextLineStart = this.lineEnd(this.curLineStart) + 1
+  this.inAsync = false
+  // Load plugins
+  this.options.pluginsLoose = options.pluginsLoose || {}
+  this.loadPlugins(this.options.pluginsLoose)
+};
+
+LooseParser.prototype.startNode = function startNode () {
+  return new __acorn.Node(this.toks, this.tok.start, this.options.locations ? this.tok.loc.start : null)
+};
+
+LooseParser.prototype.storeCurrentPos = function storeCurrentPos () {
+  return this.options.locations ? [this.tok.start, this.tok.loc.start] : this.tok.start
+};
+
+LooseParser.prototype.startNodeAt = function startNodeAt (pos) {
+  if (this.options.locations) {
+    return new __acorn.Node(this.toks, pos[0], pos[1])
+  } else {
+    return new __acorn.Node(this.toks, pos)
+  }
+};
+
+LooseParser.prototype.finishNode = function finishNode (node, type) {
+  node.type = type
+  node.end = this.last.end
+  if (this.options.locations)
+    node.loc.end = this.last.loc.end
+  if (this.options.ranges)
+    node.range[1] = this.last.end
+  return node
+};
+
+LooseParser.prototype.dummyNode = function dummyNode (type) {
+  var dummy = this.startNode()
+  dummy.type = type
+  dummy.end = dummy.start
+  if (this.options.locations)
+    dummy.loc.end = dummy.loc.start
+  if (this.options.ranges)
+    dummy.range[1] = dummy.start
+  this.last = {type: __acorn.tokTypes.name, start: dummy.start, end: dummy.start, loc: dummy.loc}
+  return dummy
+};
+
+LooseParser.prototype.dummyIdent = function dummyIdent () {
+  var dummy = this.dummyNode("Identifier")
+  dummy.name = "✖"
+  return dummy
+};
+
+LooseParser.prototype.dummyString = function dummyString () {
+  var dummy = this.dummyNode("Literal")
+  dummy.value = dummy.raw = "✖"
+  return dummy
+};
+
+LooseParser.prototype.eat = function eat (type) {
+  if (this.tok.type === type) {
+    this.next()
+    return true
+  } else {
+    return false
+  }
+};
+
+LooseParser.prototype.isContextual = function isContextual (name) {
+  return this.tok.type === __acorn.tokTypes.name && this.tok.value === name
+};
+
+LooseParser.prototype.eatContextual = function eatContextual (name) {
+  return this.tok.value === name && this.eat(__acorn.tokTypes.name)
+};
+
+LooseParser.prototype.canInsertSemicolon = function canInsertSemicolon () {
+  return this.tok.type === __acorn.tokTypes.eof || this.tok.type === __acorn.tokTypes.braceR ||
+    __acorn.lineBreak.test(this.input.slice(this.last.end, this.tok.start))
+};
+
+LooseParser.prototype.semicolon = function semicolon () {
+  return this.eat(__acorn.tokTypes.semi)
+};
+
+LooseParser.prototype.expect = function expect (type) {
+    var this$1 = this;
+
+  if (this.eat(type)) return true
+  for (var i = 1; i <= 2; i++) {
+    if (this$1.lookAhead(i).type == type) {
+      for (var j = 0; j < i; j++) this$1.next()
+      return true
+    }
+  }
+};
+
+LooseParser.prototype.pushCx = function pushCx () {
+  this.context.push(this.curIndent)
+};
+
+LooseParser.prototype.popCx = function popCx () {
+  this.curIndent = this.context.pop()
+};
+
+LooseParser.prototype.lineEnd = function lineEnd (pos) {
+  while (pos < this.input.length && !__acorn.isNewLine(this.input.charCodeAt(pos))) ++pos
+  return pos
+};
+
+LooseParser.prototype.indentationAfter = function indentationAfter (pos) {
+    var this$1 = this;
+
+  for (var count = 0;; ++pos) {
+    var ch = this$1.input.charCodeAt(pos)
+    if (ch === 32) ++count
+    else if (ch === 9) count += this$1.options.tabSize
+    else return count
+  }
+};
+
+LooseParser.prototype.closes = function closes (closeTok, indent, line, blockHeuristic) {
+  if (this.tok.type === closeTok || this.tok.type === __acorn.tokTypes.eof) return true
+  return line != this.curLineStart && this.curIndent < indent && this.tokenStartsLine() &&
+    (!blockHeuristic || this.nextLineStart >= this.input.length ||
+     this.indentationAfter(this.nextLineStart) < indent)
+};
+
+LooseParser.prototype.tokenStartsLine = function tokenStartsLine () {
+    var this$1 = this;
+
+  for (var p = this.tok.start - 1; p >= this.curLineStart; --p) {
+    var ch = this$1.input.charCodeAt(p)
+    if (ch !== 9 && ch !== 32) return false
+  }
+  return true
+};
+
+LooseParser.prototype.extend = function extend (name, f) {
+  this[name] = f(this[name])
+};
+
+LooseParser.prototype.loadPlugins = function loadPlugins (pluginConfigs) {
+    var this$1 = this;
+
+  for (var name in pluginConfigs) {
+    var plugin = pluginsLoose[name]
+    if (!plugin) throw new Error("Plugin '" + name + "' not found")
+    plugin(this$1, pluginConfigs[name])
+  }
+};
+
+var lp = LooseParser.prototype
+
+function isSpace(ch) {
+  return (ch < 14 && ch > 8) || ch === 32 || ch === 160 || __acorn.isNewLine(ch)
+}
+
+lp.next = function() {
+  var this$1 = this;
+
+  this.last = this.tok
+  if (this.ahead.length)
+    this.tok = this.ahead.shift()
+  else
+    this.tok = this.readToken()
+
+  if (this.tok.start >= this.nextLineStart) {
+    while (this.tok.start >= this.nextLineStart) {
+      this$1.curLineStart = this$1.nextLineStart
+      this$1.nextLineStart = this$1.lineEnd(this$1.curLineStart) + 1
+    }
+    this.curIndent = this.indentationAfter(this.curLineStart)
+  }
+}
+
+lp.readToken = function() {
+  var this$1 = this;
+
+  for (;;) {
+    try {
+      this$1.toks.next()
+      if (this$1.toks.type === __acorn.tokTypes.dot &&
+          this$1.input.substr(this$1.toks.end, 1) === "." &&
+          this$1.options.ecmaVersion >= 6) {
+        this$1.toks.end++
+        this$1.toks.type = __acorn.tokTypes.ellipsis
+      }
+      return new __acorn.Token(this$1.toks)
+    } catch (e) {
+      if (!(e instanceof SyntaxError)) throw e
+
+      // Try to skip some text, based on the error message, and then continue
+      var msg = e.message, pos = e.raisedAt, replace = true
+      if (/unterminated/i.test(msg)) {
+        pos = this$1.lineEnd(e.pos + 1)
+        if (/string/.test(msg)) {
+          replace = {start: e.pos, end: pos, type: __acorn.tokTypes.string, value: this$1.input.slice(e.pos + 1, pos)}
+        } else if (/regular expr/i.test(msg)) {
+          var re = this$1.input.slice(e.pos, pos)
+          try { re = new RegExp(re) } catch (e) { /* ignore compilation error due to new syntax */ }
+          replace = {start: e.pos, end: pos, type: __acorn.tokTypes.regexp, value: re}
+        } else if (/template/.test(msg)) {
+          replace = {
+            start: e.pos,
+            end: pos,
+            type: __acorn.tokTypes.template,
+            value: this$1.input.slice(e.pos, pos)
+          }
+        } else {
+          replace = false
+        }
+      } else if (/invalid (unicode|regexp|number)|expecting unicode|octal literal|is reserved|directly after number|expected number in radix/i.test(msg)) {
+        while (pos < this.input.length && !isSpace(this.input.charCodeAt(pos))) ++pos
+      } else if (/character escape|expected hexadecimal/i.test(msg)) {
+        while (pos < this.input.length) {
+          var ch = this$1.input.charCodeAt(pos++)
+          if (ch === 34 || ch === 39 || __acorn.isNewLine(ch)) break
+        }
+      } else if (/unexpected character/i.test(msg)) {
+        pos++
+        replace = false
+      } else if (/regular expression/i.test(msg)) {
+        replace = true
+      } else {
+        throw e
+      }
+      this$1.resetTo(pos)
+      if (replace === true) replace = {start: pos, end: pos, type: __acorn.tokTypes.name, value: "✖"}
+      if (replace) {
+        if (this$1.options.locations)
+          replace.loc = new __acorn.SourceLocation(
+            this$1.toks,
+            __acorn.getLineInfo(this$1.input, replace.start),
+            __acorn.getLineInfo(this$1.input, replace.end))
+        return replace
+      }
+    }
+  }
+}
+
+lp.resetTo = function(pos) {
+  var this$1 = this;
+
+  this.toks.pos = pos
+  var ch = this.input.charAt(pos - 1)
+  this.toks.exprAllowed = !ch || /[[{(,;:?/*=+\-~!|&%^<>]/.test(ch) ||
+    /[enwfd]/.test(ch) &&
+    /\b(keywords|case|else|return|throw|new|in|(instance|type)of|delete|void)$/.test(this.input.slice(pos - 10, pos))
+
+  if (this.options.locations) {
+    this.toks.curLine = 1
+    this.toks.lineStart = __acorn.lineBreakG.lastIndex = 0
+    var match
+    while ((match = __acorn.lineBreakG.exec(this.input)) && match.index < pos) {
+      ++this$1.toks.curLine
+      this$1.toks.lineStart = match.index + match[0].length
+    }
+  }
+}
+
+lp.lookAhead = function(n) {
+  var this$1 = this;
+
+  while (n > this.ahead.length)
+    this$1.ahead.push(this$1.readToken())
+  return this.ahead[n - 1]
+}
+
+function isDummy(node) { return node.name == "✖" }
+
+var lp$1 = LooseParser.prototype
+
+lp$1.parseTopLevel = function() {
+  var this$1 = this;
+
+  var node = this.startNodeAt(this.options.locations ? [0, __acorn.getLineInfo(this.input, 0)] : 0)
+  node.body = []
+  while (this.tok.type !== __acorn.tokTypes.eof) node.body.push(this$1.parseStatement())
+  this.last = this.tok
+  if (this.options.ecmaVersion >= 6) {
+    node.sourceType = this.options.sourceType
+  }
+  return this.finishNode(node, "Program")
+}
+
+lp$1.parseStatement = function() {
+  var this$1 = this;
+
+  var starttype = this.tok.type, node = this.startNode(), kind
+
+  if (this.toks.isLet()) {
+    starttype = __acorn.tokTypes._var
+    kind = "let"
+  }
+
+  switch (starttype) {
+  case __acorn.tokTypes._break: case __acorn.tokTypes._continue:
+    this.next()
+    var isBreak = starttype === __acorn.tokTypes._break
+    if (this.semicolon() || this.canInsertSemicolon()) {
+      node.label = null
+    } else {
+      node.label = this.tok.type === __acorn.tokTypes.name ? this.parseIdent() : null
+      this.semicolon()
+    }
+    return this.finishNode(node, isBreak ? "BreakStatement" : "ContinueStatement")
+
+  case __acorn.tokTypes._debugger:
+    this.next()
+    this.semicolon()
+    return this.finishNode(node, "DebuggerStatement")
+
+  case __acorn.tokTypes._do:
+    this.next()
+    node.body = this.parseStatement()
+    node.test = this.eat(__acorn.tokTypes._while) ? this.parseParenExpression() : this.dummyIdent()
+    this.semicolon()
+    return this.finishNode(node, "DoWhileStatement")
+
+  case __acorn.tokTypes._for:
+    this.next()
+    this.pushCx()
+    this.expect(__acorn.tokTypes.parenL)
+    if (this.tok.type === __acorn.tokTypes.semi) return this.parseFor(node, null)
+    var isLet = this.toks.isLet()
+    if (isLet || this.tok.type === __acorn.tokTypes._var || this.tok.type === __acorn.tokTypes._const) {
+      var init$1 = this.parseVar(true, isLet ? "let" : this.tok.value)
+      if (init$1.declarations.length === 1 && (this.tok.type === __acorn.tokTypes._in || this.isContextual("of"))) {
+        return this.parseForIn(node, init$1)
+      }
+      return this.parseFor(node, init$1)
+    }
+    var init = this.parseExpression(true)
+    if (this.tok.type === __acorn.tokTypes._in || this.isContextual("of"))
+      return this.parseForIn(node, this.toAssignable(init))
+    return this.parseFor(node, init)
+
+  case __acorn.tokTypes._function:
+    this.next()
+    return this.parseFunction(node, true)
+
+  case __acorn.tokTypes._if:
+    this.next()
+    node.test = this.parseParenExpression()
+    node.consequent = this.parseStatement()
+    node.alternate = this.eat(__acorn.tokTypes._else) ? this.parseStatement() : null
+    return this.finishNode(node, "IfStatement")
+
+  case __acorn.tokTypes._return:
+    this.next()
+    if (this.eat(__acorn.tokTypes.semi) || this.canInsertSemicolon()) node.argument = null
+    else { node.argument = this.parseExpression(); this.semicolon() }
+    return this.finishNode(node, "ReturnStatement")
+
+  case __acorn.tokTypes._switch:
+    var blockIndent = this.curIndent, line = this.curLineStart
+    this.next()
+    node.discriminant = this.parseParenExpression()
+    node.cases = []
+    this.pushCx()
+    this.expect(__acorn.tokTypes.braceL)
+
+    var cur
+    while (!this.closes(__acorn.tokTypes.braceR, blockIndent, line, true)) {
+      if (this$1.tok.type === __acorn.tokTypes._case || this$1.tok.type === __acorn.tokTypes._default) {
+        var isCase = this$1.tok.type === __acorn.tokTypes._case
+        if (cur) this$1.finishNode(cur, "SwitchCase")
+        node.cases.push(cur = this$1.startNode())
+        cur.consequent = []
+        this$1.next()
+        if (isCase) cur.test = this$1.parseExpression()
+        else cur.test = null
+        this$1.expect(__acorn.tokTypes.colon)
+      } else {
+        if (!cur) {
+          node.cases.push(cur = this$1.startNode())
+          cur.consequent = []
+          cur.test = null
+        }
+        cur.consequent.push(this$1.parseStatement())
+      }
+    }
+    if (cur) this.finishNode(cur, "SwitchCase")
+    this.popCx()
+    this.eat(__acorn.tokTypes.braceR)
+    return this.finishNode(node, "SwitchStatement")
+
+  case __acorn.tokTypes._throw:
+    this.next()
+    node.argument = this.parseExpression()
+    this.semicolon()
+    return this.finishNode(node, "ThrowStatement")
+
+  case __acorn.tokTypes._try:
+    this.next()
+    node.block = this.parseBlock()
+    node.handler = null
+    if (this.tok.type === __acorn.tokTypes._catch) {
+      var clause = this.startNode()
+      this.next()
+      this.expect(__acorn.tokTypes.parenL)
+      clause.param = this.toAssignable(this.parseExprAtom(), true)
+      this.expect(__acorn.tokTypes.parenR)
+      clause.body = this.parseBlock()
+      node.handler = this.finishNode(clause, "CatchClause")
+    }
+    node.finalizer = this.eat(__acorn.tokTypes._finally) ? this.parseBlock() : null
+    if (!node.handler && !node.finalizer) return node.block
+    return this.finishNode(node, "TryStatement")
+
+  case __acorn.tokTypes._var:
+  case __acorn.tokTypes._const:
+    return this.parseVar(false, kind || this.tok.value)
+
+  case __acorn.tokTypes._while:
+    this.next()
+    node.test = this.parseParenExpression()
+    node.body = this.parseStatement()
+    return this.finishNode(node, "WhileStatement")
+
+  case __acorn.tokTypes._with:
+    this.next()
+    node.object = this.parseParenExpression()
+    node.body = this.parseStatement()
+    return this.finishNode(node, "WithStatement")
+
+  case __acorn.tokTypes.braceL:
+    return this.parseBlock()
+
+  case __acorn.tokTypes.semi:
+    this.next()
+    return this.finishNode(node, "EmptyStatement")
+
+  case __acorn.tokTypes._class:
+    return this.parseClass(true)
+
+  case __acorn.tokTypes._import:
+    return this.parseImport()
+
+  case __acorn.tokTypes._export:
+    return this.parseExport()
+
+  default:
+    if (this.toks.isAsyncFunction()) {
+      this.next()
+      this.next()
+      return this.parseFunction(node, true, true)
+    }
+    var expr = this.parseExpression()
+    if (isDummy(expr)) {
+      this.next()
+      if (this.tok.type === __acorn.tokTypes.eof) return this.finishNode(node, "EmptyStatement")
+      return this.parseStatement()
+    } else if (starttype === __acorn.tokTypes.name && expr.type === "Identifier" && this.eat(__acorn.tokTypes.colon)) {
+      node.body = this.parseStatement()
+      node.label = expr
+      return this.finishNode(node, "LabeledStatement")
+    } else {
+      node.expression = expr
+      this.semicolon()
+      return this.finishNode(node, "ExpressionStatement")
+    }
+  }
+}
+
+lp$1.parseBlock = function() {
+  var this$1 = this;
+
+  var node = this.startNode()
+  this.pushCx()
+  this.expect(__acorn.tokTypes.braceL)
+  var blockIndent = this.curIndent, line = this.curLineStart
+  node.body = []
+  while (!this.closes(__acorn.tokTypes.braceR, blockIndent, line, true))
+    node.body.push(this$1.parseStatement())
+  this.popCx()
+  this.eat(__acorn.tokTypes.braceR)
+  return this.finishNode(node, "BlockStatement")
+}
+
+lp$1.parseFor = function(node, init) {
+  node.init = init
+  node.test = node.update = null
+  if (this.eat(__acorn.tokTypes.semi) && this.tok.type !== __acorn.tokTypes.semi) node.test = this.parseExpression()
+  if (this.eat(__acorn.tokTypes.semi) && this.tok.type !== __acorn.tokTypes.parenR) node.update = this.parseExpression()
+  this.popCx()
+  this.expect(__acorn.tokTypes.parenR)
+  node.body = this.parseStatement()
+  return this.finishNode(node, "ForStatement")
+}
+
+lp$1.parseForIn = function(node, init) {
+  var type = this.tok.type === __acorn.tokTypes._in ? "ForInStatement" : "ForOfStatement"
+  this.next()
+  node.left = init
+  node.right = this.parseExpression()
+  this.popCx()
+  this.expect(__acorn.tokTypes.parenR)
+  node.body = this.parseStatement()
+  return this.finishNode(node, type)
+}
+
+lp$1.parseVar = function(noIn, kind) {
+  var this$1 = this;
+
+  var node = this.startNode()
+  node.kind = kind
+  this.next()
+  node.declarations = []
+  do {
+    var decl = this$1.startNode()
+    decl.id = this$1.options.ecmaVersion >= 6 ? this$1.toAssignable(this$1.parseExprAtom(), true) : this$1.parseIdent()
+    decl.init = this$1.eat(__acorn.tokTypes.eq) ? this$1.parseMaybeAssign(noIn) : null
+    node.declarations.push(this$1.finishNode(decl, "VariableDeclarator"))
+  } while (this.eat(__acorn.tokTypes.comma))
+  if (!node.declarations.length) {
+    var decl$1 = this.startNode()
+    decl$1.id = this.dummyIdent()
+    node.declarations.push(this.finishNode(decl$1, "VariableDeclarator"))
+  }
+  if (!noIn) this.semicolon()
+  return this.finishNode(node, "VariableDeclaration")
+}
+
+lp$1.parseClass = function(isStatement) {
+  var this$1 = this;
+
+  var node = this.startNode()
+  this.next()
+  if (this.tok.type === __acorn.tokTypes.name) node.id = this.parseIdent()
+  else if (isStatement === true) node.id = this.dummyIdent()
+  else node.id = null
+  node.superClass = this.eat(__acorn.tokTypes._extends) ? this.parseExpression() : null
+  node.body = this.startNode()
+  node.body.body = []
+  this.pushCx()
+  var indent = this.curIndent + 1, line = this.curLineStart
+  this.eat(__acorn.tokTypes.braceL)
+  if (this.curIndent + 1 < indent) { indent = this.curIndent; line = this.curLineStart }
+  while (!this.closes(__acorn.tokTypes.braceR, indent, line)) {
+    if (this$1.semicolon()) continue
+    var method = this$1.startNode(), isGenerator, isAsync
+    if (this$1.options.ecmaVersion >= 6) {
+      method.static = false
+      isGenerator = this$1.eat(__acorn.tokTypes.star)
+    }
+    this$1.parsePropertyName(method)
+    if (isDummy(method.key)) { if (isDummy(this$1.parseMaybeAssign())) this$1.next(); this$1.eat(__acorn.tokTypes.comma); continue }
+    if (method.key.type === "Identifier" && !method.computed && method.key.name === "static" &&
+        (this$1.tok.type != __acorn.tokTypes.parenL && this$1.tok.type != __acorn.tokTypes.braceL)) {
+      method.static = true
+      isGenerator = this$1.eat(__acorn.tokTypes.star)
+      this$1.parsePropertyName(method)
+    } else {
+      method.static = false
+    }
+    if (!method.computed &&
+        method.key.type === "Identifier" && method.key.name === "async" && this$1.tok.type !== __acorn.tokTypes.parenL &&
+        !this$1.canInsertSemicolon()) {
+      this$1.parsePropertyName(method)
+      isAsync = true
+    } else {
+      isAsync = false
+    }
+    if (this$1.options.ecmaVersion >= 5 && method.key.type === "Identifier" &&
+        !method.computed && (method.key.name === "get" || method.key.name === "set") &&
+        this$1.tok.type !== __acorn.tokTypes.parenL && this$1.tok.type !== __acorn.tokTypes.braceL) {
+      method.kind = method.key.name
+      this$1.parsePropertyName(method)
+      method.value = this$1.parseMethod(false)
+    } else {
+      if (!method.computed && !method.static && !isGenerator && !isAsync && (
+        method.key.type === "Identifier" && method.key.name === "constructor" ||
+          method.key.type === "Literal" && method.key.value === "constructor")) {
+        method.kind = "constructor"
+      } else {
+        method.kind = "method"
+      }
+      method.value = this$1.parseMethod(isGenerator, isAsync)
+    }
+    node.body.body.push(this$1.finishNode(method, "MethodDefinition"))
+  }
+  this.popCx()
+  if (!this.eat(__acorn.tokTypes.braceR)) {
+    // If there is no closing brace, make the node span to the start
+    // of the next token (this is useful for Tern)
+    this.last.end = this.tok.start
+    if (this.options.locations) this.last.loc.end = this.tok.loc.start
+  }
+  this.semicolon()
+  this.finishNode(node.body, "ClassBody")
+  return this.finishNode(node, isStatement ? "ClassDeclaration" : "ClassExpression")
+}
+
+lp$1.parseFunction = function(node, isStatement, isAsync) {
+  var oldInAsync = this.inAsync
+  this.initFunction(node)
+  if (this.options.ecmaVersion >= 6) {
+    node.generator = this.eat(__acorn.tokTypes.star)
+  }
+  if (this.options.ecmaVersion >= 8) {
+    node.async = !!isAsync
+  }
+  if (this.tok.type === __acorn.tokTypes.name) node.id = this.parseIdent()
+  else if (isStatement === true) node.id = this.dummyIdent()
+  this.inAsync = node.async
+  node.params = this.parseFunctionParams()
+  node.body = this.parseBlock()
+  this.inAsync = oldInAsync
+  return this.finishNode(node, isStatement ? "FunctionDeclaration" : "FunctionExpression")
+}
+
+lp$1.parseExport = function() {
+  var node = this.startNode()
+  this.next()
+  if (this.eat(__acorn.tokTypes.star)) {
+    node.source = this.eatContextual("from") ? this.parseExprAtom() : this.dummyString()
+    return this.finishNode(node, "ExportAllDeclaration")
+  }
+  if (this.eat(__acorn.tokTypes._default)) {
+    // export default (function foo() {}) // This is FunctionExpression.
+    var isAsync
+    if (this.tok.type === __acorn.tokTypes._function || (isAsync = this.toks.isAsyncFunction())) {
+      var fNode = this.startNode()
+      this.next()
+      if (isAsync) this.next()
+      node.declaration = this.parseFunction(fNode, "nullableID", isAsync)
+    } else if (this.tok.type === __acorn.tokTypes._class) {
+      node.declaration = this.parseClass("nullableID")
+    } else {
+      node.declaration = this.parseMaybeAssign()
+      this.semicolon()
+    }
+    return this.finishNode(node, "ExportDefaultDeclaration")
+  }
+  if (this.tok.type.keyword || this.toks.isLet() || this.toks.isAsyncFunction()) {
+    node.declaration = this.parseStatement()
+    node.specifiers = []
+    node.source = null
+  } else {
+    node.declaration = null
+    node.specifiers = this.parseExportSpecifierList()
+    node.source = this.eatContextual("from") ? this.parseExprAtom() : null
+    this.semicolon()
+  }
+  return this.finishNode(node, "ExportNamedDeclaration")
+}
+
+lp$1.parseImport = function() {
+  var node = this.startNode()
+  this.next()
+  if (this.tok.type === __acorn.tokTypes.string) {
+    node.specifiers = []
+    node.source = this.parseExprAtom()
+    node.kind = ""
+  } else {
+    var elt
+    if (this.tok.type === __acorn.tokTypes.name && this.tok.value !== "from") {
+      elt = this.startNode()
+      elt.local = this.parseIdent()
+      this.finishNode(elt, "ImportDefaultSpecifier")
+      this.eat(__acorn.tokTypes.comma)
+    }
+    node.specifiers = this.parseImportSpecifierList()
+    node.source = this.eatContextual("from") && this.tok.type == __acorn.tokTypes.string ? this.parseExprAtom() : this.dummyString()
+    if (elt) node.specifiers.unshift(elt)
+  }
+  this.semicolon()
+  return this.finishNode(node, "ImportDeclaration")
+}
+
+lp$1.parseImportSpecifierList = function() {
+  var this$1 = this;
+
+  var elts = []
+  if (this.tok.type === __acorn.tokTypes.star) {
+    var elt = this.startNode()
+    this.next()
+    elt.local = this.eatContextual("as") ? this.parseIdent() : this.dummyIdent()
+    elts.push(this.finishNode(elt, "ImportNamespaceSpecifier"))
+  } else {
+    var indent = this.curIndent, line = this.curLineStart, continuedLine = this.nextLineStart
+    this.pushCx()
+    this.eat(__acorn.tokTypes.braceL)
+    if (this.curLineStart > continuedLine) continuedLine = this.curLineStart
+    while (!this.closes(__acorn.tokTypes.braceR, indent + (this.curLineStart <= continuedLine ? 1 : 0), line)) {
+      var elt$1 = this$1.startNode()
+      if (this$1.eat(__acorn.tokTypes.star)) {
+        elt$1.local = this$1.eatContextual("as") ? this$1.parseIdent() : this$1.dummyIdent()
+        this$1.finishNode(elt$1, "ImportNamespaceSpecifier")
+      } else {
+        if (this$1.isContextual("from")) break
+        elt$1.imported = this$1.parseIdent()
+        if (isDummy(elt$1.imported)) break
+        elt$1.local = this$1.eatContextual("as") ? this$1.parseIdent() : elt$1.imported
+        this$1.finishNode(elt$1, "ImportSpecifier")
+      }
+      elts.push(elt$1)
+      this$1.eat(__acorn.tokTypes.comma)
+    }
+    this.eat(__acorn.tokTypes.braceR)
+    this.popCx()
+  }
+  return elts
+}
+
+lp$1.parseExportSpecifierList = function() {
+  var this$1 = this;
+
+  var elts = []
+  var indent = this.curIndent, line = this.curLineStart, continuedLine = this.nextLineStart
+  this.pushCx()
+  this.eat(__acorn.tokTypes.braceL)
+  if (this.curLineStart > continuedLine) continuedLine = this.curLineStart
+  while (!this.closes(__acorn.tokTypes.braceR, indent + (this.curLineStart <= continuedLine ? 1 : 0), line)) {
+    if (this$1.isContextual("from")) break
+    var elt = this$1.startNode()
+    elt.local = this$1.parseIdent()
+    if (isDummy(elt.local)) break
+    elt.exported = this$1.eatContextual("as") ? this$1.parseIdent() : elt.local
+    this$1.finishNode(elt, "ExportSpecifier")
+    elts.push(elt)
+    this$1.eat(__acorn.tokTypes.comma)
+  }
+  this.eat(__acorn.tokTypes.braceR)
+  this.popCx()
+  return elts
+}
+
+var lp$2 = LooseParser.prototype
+
+lp$2.checkLVal = function(expr) {
+  if (!expr) return expr
+  switch (expr.type) {
+  case "Identifier":
+  case "MemberExpression":
+    return expr
+
+  case "ParenthesizedExpression":
+    expr.expression = this.checkLVal(expr.expression)
+    return expr
+
+  default:
+    return this.dummyIdent()
+  }
+}
+
+lp$2.parseExpression = function(noIn) {
+  var this$1 = this;
+
+  var start = this.storeCurrentPos()
+  var expr = this.parseMaybeAssign(noIn)
+  if (this.tok.type === __acorn.tokTypes.comma) {
+    var node = this.startNodeAt(start)
+    node.expressions = [expr]
+    while (this.eat(__acorn.tokTypes.comma)) node.expressions.push(this$1.parseMaybeAssign(noIn))
+    return this.finishNode(node, "SequenceExpression")
+  }
+  return expr
+}
+
+lp$2.parseParenExpression = function() {
+  this.pushCx()
+  this.expect(__acorn.tokTypes.parenL)
+  var val = this.parseExpression()
+  this.popCx()
+  this.expect(__acorn.tokTypes.parenR)
+  return val
+}
+
+lp$2.parseMaybeAssign = function(noIn) {
+  if (this.toks.isContextual("yield")) {
+    var node = this.startNode()
+    this.next()
+    if (this.semicolon() || this.canInsertSemicolon() || (this.tok.type != __acorn.tokTypes.star && !this.tok.type.startsExpr)) {
+      node.delegate = false
+      node.argument = null
+    } else {
+      node.delegate = this.eat(__acorn.tokTypes.star)
+      node.argument = this.parseMaybeAssign()
+    }
+    return this.finishNode(node, "YieldExpression")
+  }
+
+  var start = this.storeCurrentPos()
+  var left = this.parseMaybeConditional(noIn)
+  if (this.tok.type.isAssign) {
+    var node$1 = this.startNodeAt(start)
+    node$1.operator = this.tok.value
+    node$1.left = this.tok.type === __acorn.tokTypes.eq ? this.toAssignable(left) : this.checkLVal(left)
+    this.next()
+    node$1.right = this.parseMaybeAssign(noIn)
+    return this.finishNode(node$1, "AssignmentExpression")
+  }
+  return left
+}
+
+lp$2.parseMaybeConditional = function(noIn) {
+  var start = this.storeCurrentPos()
+  var expr = this.parseExprOps(noIn)
+  if (this.eat(__acorn.tokTypes.question)) {
+    var node = this.startNodeAt(start)
+    node.test = expr
+    node.consequent = this.parseMaybeAssign()
+    node.alternate = this.expect(__acorn.tokTypes.colon) ? this.parseMaybeAssign(noIn) : this.dummyIdent()
+    return this.finishNode(node, "ConditionalExpression")
+  }
+  return expr
+}
+
+lp$2.parseExprOps = function(noIn) {
+  var start = this.storeCurrentPos()
+  var indent = this.curIndent, line = this.curLineStart
+  return this.parseExprOp(this.parseMaybeUnary(false), start, -1, noIn, indent, line)
+}
+
+lp$2.parseExprOp = function(left, start, minPrec, noIn, indent, line) {
+  if (this.curLineStart != line && this.curIndent < indent && this.tokenStartsLine()) return left
+  var prec = this.tok.type.binop
+  if (prec != null && (!noIn || this.tok.type !== __acorn.tokTypes._in)) {
+    if (prec > minPrec) {
+      var node = this.startNodeAt(start)
+      node.left = left
+      node.operator = this.tok.value
+      this.next()
+      if (this.curLineStart != line && this.curIndent < indent && this.tokenStartsLine()) {
+        node.right = this.dummyIdent()
+      } else {
+        var rightStart = this.storeCurrentPos()
+        node.right = this.parseExprOp(this.parseMaybeUnary(false), rightStart, prec, noIn, indent, line)
+      }
+      this.finishNode(node, /&&|\|\|/.test(node.operator) ? "LogicalExpression" : "BinaryExpression")
+      return this.parseExprOp(node, start, minPrec, noIn, indent, line)
+    }
+  }
+  return left
+}
+
+lp$2.parseMaybeUnary = function(sawUnary) {
+  var this$1 = this;
+
+  var start = this.storeCurrentPos(), expr
+  if (this.options.ecmaVersion >= 8 && this.inAsync && this.toks.isContextual("await")) {
+    expr = this.parseAwait()
+    sawUnary = true
+  } else if (this.tok.type.prefix) {
+    var node = this.startNode(), update = this.tok.type === __acorn.tokTypes.incDec
+    if (!update) sawUnary = true
+    node.operator = this.tok.value
+    node.prefix = true
+    this.next()
+    node.argument = this.parseMaybeUnary(true)
+    if (update) node.argument = this.checkLVal(node.argument)
+    expr = this.finishNode(node, update ? "UpdateExpression" : "UnaryExpression")
+  } else if (this.tok.type === __acorn.tokTypes.ellipsis) {
+    var node$1 = this.startNode()
+    this.next()
+    node$1.argument = this.parseMaybeUnary(sawUnary)
+    expr = this.finishNode(node$1, "SpreadElement")
+  } else {
+    expr = this.parseExprSubscripts()
+    while (this.tok.type.postfix && !this.canInsertSemicolon()) {
+      var node$2 = this$1.startNodeAt(start)
+      node$2.operator = this$1.tok.value
+      node$2.prefix = false
+      node$2.argument = this$1.checkLVal(expr)
+      this$1.next()
+      expr = this$1.finishNode(node$2, "UpdateExpression")
+    }
+  }
+
+  if (!sawUnary && this.eat(__acorn.tokTypes.starstar)) {
+    var node$3 = this.startNodeAt(start)
+    node$3.operator = "**"
+    node$3.left = expr
+    node$3.right = this.parseMaybeUnary(false)
+    return this.finishNode(node$3, "BinaryExpression")
+  }
+
+  return expr
+}
+
+lp$2.parseExprSubscripts = function() {
+  var start = this.storeCurrentPos()
+  return this.parseSubscripts(this.parseExprAtom(), start, false, this.curIndent, this.curLineStart)
+}
+
+lp$2.parseSubscripts = function(base, start, noCalls, startIndent, line) {
+  var this$1 = this;
+
+  for (;;) {
+    if (this$1.curLineStart != line && this$1.curIndent <= startIndent && this$1.tokenStartsLine()) {
+      if (this$1.tok.type == __acorn.tokTypes.dot && this$1.curIndent == startIndent)
+        --startIndent
+      else
+        return base
+    }
+
+    var maybeAsyncArrow = base.type === "Identifier" && base.name === "async" && !this$1.canInsertSemicolon()
+
+    if (this$1.eat(__acorn.tokTypes.dot)) {
+      var node = this$1.startNodeAt(start)
+      node.object = base
+      if (this$1.curLineStart != line && this$1.curIndent <= startIndent && this$1.tokenStartsLine())
+        node.property = this$1.dummyIdent()
+      else
+        node.property = this$1.parsePropertyAccessor() || this$1.dummyIdent()
+      node.computed = false
+      base = this$1.finishNode(node, "MemberExpression")
+    } else if (this$1.tok.type == __acorn.tokTypes.bracketL) {
+      this$1.pushCx()
+      this$1.next()
+      var node$1 = this$1.startNodeAt(start)
+      node$1.object = base
+      node$1.property = this$1.parseExpression()
+      node$1.computed = true
+      this$1.popCx()
+      this$1.expect(__acorn.tokTypes.bracketR)
+      base = this$1.finishNode(node$1, "MemberExpression")
+    } else if (!noCalls && this$1.tok.type == __acorn.tokTypes.parenL) {
+      var exprList = this$1.parseExprList(__acorn.tokTypes.parenR)
+      if (maybeAsyncArrow && this$1.eat(__acorn.tokTypes.arrow))
+        return this$1.parseArrowExpression(this$1.startNodeAt(start), exprList, true)
+      var node$2 = this$1.startNodeAt(start)
+      node$2.callee = base
+      node$2.arguments = exprList
+      base = this$1.finishNode(node$2, "CallExpression")
+    } else if (this$1.tok.type == __acorn.tokTypes.backQuote) {
+      var node$3 = this$1.startNodeAt(start)
+      node$3.tag = base
+      node$3.quasi = this$1.parseTemplate()
+      base = this$1.finishNode(node$3, "TaggedTemplateExpression")
+    } else {
+      return base
+    }
+  }
+}
+
+lp$2.parseExprAtom = function() {
+  var node
+  switch (this.tok.type) {
+  case __acorn.tokTypes._this:
+  case __acorn.tokTypes._super:
+    var type = this.tok.type === __acorn.tokTypes._this ? "ThisExpression" : "Super"
+    node = this.startNode()
+    this.next()
+    return this.finishNode(node, type)
+
+  case __acorn.tokTypes.name:
+    var start = this.storeCurrentPos()
+    var id = this.parseIdent()
+    var isAsync = false
+    if (id.name === "async" && !this.canInsertSemicolon()) {
+      if (this.eat(__acorn.tokTypes._function))
+        return this.parseFunction(this.startNodeAt(start), false, true)
+      if (this.tok.type === __acorn.tokTypes.name) {
+        id = this.parseIdent()
+        isAsync = true
+      }
+    }
+    return this.eat(__acorn.tokTypes.arrow) ? this.parseArrowExpression(this.startNodeAt(start), [id], isAsync) : id
+
+  case __acorn.tokTypes.regexp:
+    node = this.startNode()
+    var val = this.tok.value
+    node.regex = {pattern: val.pattern, flags: val.flags}
+    node.value = val.value
+    node.raw = this.input.slice(this.tok.start, this.tok.end)
+    this.next()
+    return this.finishNode(node, "Literal")
+
+  case __acorn.tokTypes.num: case __acorn.tokTypes.string:
+    node = this.startNode()
+    node.value = this.tok.value
+    node.raw = this.input.slice(this.tok.start, this.tok.end)
+    this.next()
+    return this.finishNode(node, "Literal")
+
+  case __acorn.tokTypes._null: case __acorn.tokTypes._true: case __acorn.tokTypes._false:
+    node = this.startNode()
+    node.value = this.tok.type === __acorn.tokTypes._null ? null : this.tok.type === __acorn.tokTypes._true
+    node.raw = this.tok.type.keyword
+    this.next()
+    return this.finishNode(node, "Literal")
+
+  case __acorn.tokTypes.parenL:
+    var parenStart = this.storeCurrentPos()
+    this.next()
+    var inner = this.parseExpression()
+    this.expect(__acorn.tokTypes.parenR)
+    if (this.eat(__acorn.tokTypes.arrow)) {
+      // (a,)=>a // SequenceExpression makes dummy in the last hole. Drop the dummy.
+      var params = inner.expressions || [inner]
+      if (params.length && isDummy(params[params.length - 1]))
+        params.pop()
+      return this.parseArrowExpression(this.startNodeAt(parenStart), params)
+    }
+    if (this.options.preserveParens) {
+      var par = this.startNodeAt(parenStart)
+      par.expression = inner
+      inner = this.finishNode(par, "ParenthesizedExpression")
+    }
+    return inner
+
+  case __acorn.tokTypes.bracketL:
+    node = this.startNode()
+    node.elements = this.parseExprList(__acorn.tokTypes.bracketR, true)
+    return this.finishNode(node, "ArrayExpression")
+
+  case __acorn.tokTypes.braceL:
+    return this.parseObj()
+
+  case __acorn.tokTypes._class:
+    return this.parseClass(false)
+
+  case __acorn.tokTypes._function:
+    node = this.startNode()
+    this.next()
+    return this.parseFunction(node, false)
+
+  case __acorn.tokTypes._new:
+    return this.parseNew()
+
+  case __acorn.tokTypes.backQuote:
+    return this.parseTemplate()
+
+  default:
+    return this.dummyIdent()
+  }
+}
+
+lp$2.parseNew = function() {
+  var node = this.startNode(), startIndent = this.curIndent, line = this.curLineStart
+  var meta = this.parseIdent(true)
+  if (this.options.ecmaVersion >= 6 && this.eat(__acorn.tokTypes.dot)) {
+    node.meta = meta
+    node.property = this.parseIdent(true)
+    return this.finishNode(node, "MetaProperty")
+  }
+  var start = this.storeCurrentPos()
+  node.callee = this.parseSubscripts(this.parseExprAtom(), start, true, startIndent, line)
+  if (this.tok.type == __acorn.tokTypes.parenL) {
+    node.arguments = this.parseExprList(__acorn.tokTypes.parenR)
+  } else {
+    node.arguments = []
+  }
+  return this.finishNode(node, "NewExpression")
+}
+
+lp$2.parseTemplateElement = function() {
+  var elem = this.startNode()
+  elem.value = {
+    raw: this.input.slice(this.tok.start, this.tok.end).replace(/\r\n?/g, "\n"),
+    cooked: this.tok.value
+  }
+  this.next()
+  elem.tail = this.tok.type === __acorn.tokTypes.backQuote
+  return this.finishNode(elem, "TemplateElement")
+}
+
+lp$2.parseTemplate = function() {
+  var this$1 = this;
+
+  var node = this.startNode()
+  this.next()
+  node.expressions = []
+  var curElt = this.parseTemplateElement()
+  node.quasis = [curElt]
+  while (!curElt.tail) {
+    this$1.next()
+    node.expressions.push(this$1.parseExpression())
+    if (this$1.expect(__acorn.tokTypes.braceR)) {
+      curElt = this$1.parseTemplateElement()
+    } else {
+      curElt = this$1.startNode()
+      curElt.value = {cooked: "", raw: ""}
+      curElt.tail = true
+      this$1.finishNode(curElt, "TemplateElement")
+    }
+    node.quasis.push(curElt)
+  }
+  this.expect(__acorn.tokTypes.backQuote)
+  return this.finishNode(node, "TemplateLiteral")
+}
+
+lp$2.parseObj = function() {
+  var this$1 = this;
+
+  var node = this.startNode()
+  node.properties = []
+  this.pushCx()
+  var indent = this.curIndent + 1, line = this.curLineStart
+  this.eat(__acorn.tokTypes.braceL)
+  if (this.curIndent + 1 < indent) { indent = this.curIndent; line = this.curLineStart }
+  while (!this.closes(__acorn.tokTypes.braceR, indent, line)) {
+    var prop = this$1.startNode(), isGenerator, isAsync, start
+    if (this$1.options.ecmaVersion >= 6) {
+      start = this$1.storeCurrentPos()
+      prop.method = false
+      prop.shorthand = false
+      isGenerator = this$1.eat(__acorn.tokTypes.star)
+    }
+    this$1.parsePropertyName(prop)
+    if (!prop.computed &&
+        prop.key.type === "Identifier" && prop.key.name === "async" && this$1.tok.type !== __acorn.tokTypes.parenL &&
+        this$1.tok.type !== __acorn.tokTypes.colon && !this$1.canInsertSemicolon()) {
+      this$1.parsePropertyName(prop)
+      isAsync = true
+    } else {
+      isAsync = false
+    }
+    if (isDummy(prop.key)) { if (isDummy(this$1.parseMaybeAssign())) this$1.next(); this$1.eat(__acorn.tokTypes.comma); continue }
+    if (this$1.eat(__acorn.tokTypes.colon)) {
+      prop.kind = "init"
+      prop.value = this$1.parseMaybeAssign()
+    } else if (this$1.options.ecmaVersion >= 6 && (this$1.tok.type === __acorn.tokTypes.parenL || this$1.tok.type === __acorn.tokTypes.braceL)) {
+      prop.kind = "init"
+      prop.method = true
+      prop.value = this$1.parseMethod(isGenerator, isAsync)
+    } else if (this$1.options.ecmaVersion >= 5 && prop.key.type === "Identifier" &&
+               !prop.computed && (prop.key.name === "get" || prop.key.name === "set") &&
+               (this$1.tok.type != __acorn.tokTypes.comma && this$1.tok.type != __acorn.tokTypes.braceR)) {
+      prop.kind = prop.key.name
+      this$1.parsePropertyName(prop)
+      prop.value = this$1.parseMethod(false)
+    } else {
+      prop.kind = "init"
+      if (this$1.options.ecmaVersion >= 6) {
+        if (this$1.eat(__acorn.tokTypes.eq)) {
+          var assign = this$1.startNodeAt(start)
+          assign.operator = "="
+          assign.left = prop.key
+          assign.right = this$1.parseMaybeAssign()
+          prop.value = this$1.finishNode(assign, "AssignmentExpression")
+        } else {
+          prop.value = prop.key
+        }
+      } else {
+        prop.value = this$1.dummyIdent()
+      }
+      prop.shorthand = true
+    }
+    node.properties.push(this$1.finishNode(prop, "Property"))
+    this$1.eat(__acorn.tokTypes.comma)
+  }
+  this.popCx()
+  if (!this.eat(__acorn.tokTypes.braceR)) {
+    // If there is no closing brace, make the node span to the start
+    // of the next token (this is useful for Tern)
+    this.last.end = this.tok.start
+    if (this.options.locations) this.last.loc.end = this.tok.loc.start
+  }
+  return this.finishNode(node, "ObjectExpression")
+}
+
+lp$2.parsePropertyName = function(prop) {
+  if (this.options.ecmaVersion >= 6) {
+    if (this.eat(__acorn.tokTypes.bracketL)) {
+      prop.computed = true
+      prop.key = this.parseExpression()
+      this.expect(__acorn.tokTypes.bracketR)
+      return
+    } else {
+      prop.computed = false
+    }
+  }
+  var key = (this.tok.type === __acorn.tokTypes.num || this.tok.type === __acorn.tokTypes.string) ? this.parseExprAtom() : this.parseIdent()
+  prop.key = key || this.dummyIdent()
+}
+
+lp$2.parsePropertyAccessor = function() {
+  if (this.tok.type === __acorn.tokTypes.name || this.tok.type.keyword) return this.parseIdent()
+}
+
+lp$2.parseIdent = function() {
+  var name = this.tok.type === __acorn.tokTypes.name ? this.tok.value : this.tok.type.keyword
+  if (!name) return this.dummyIdent()
+  var node = this.startNode()
+  this.next()
+  node.name = name
+  return this.finishNode(node, "Identifier")
+}
+
+lp$2.initFunction = function(node) {
+  node.id = null
+  node.params = []
+  if (this.options.ecmaVersion >= 6) {
+    node.generator = false
+    node.expression = false
+  }
+  if (this.options.ecmaVersion >= 8)
+    node.async = false
+}
+
+// Convert existing expression atom to assignable pattern
+// if possible.
+
+lp$2.toAssignable = function(node, binding) {
+  var this$1 = this;
+
+  if (!node || node.type == "Identifier" || (node.type == "MemberExpression" && !binding)) {
+    // Okay
+  } else if (node.type == "ParenthesizedExpression") {
+    node.expression = this.toAssignable(node.expression, binding)
+  } else if (this.options.ecmaVersion < 6) {
+    return this.dummyIdent()
+  } else if (node.type == "ObjectExpression") {
+    node.type = "ObjectPattern"
+    var props = node.properties
+    for (var i = 0; i < props.length; i++)
+      props[i].value = this$1.toAssignable(props[i].value, binding)
+  } else if (node.type == "ArrayExpression") {
+    node.type = "ArrayPattern"
+    this.toAssignableList(node.elements, binding)
+  } else if (node.type == "SpreadElement") {
+    node.type = "RestElement"
+    node.argument = this.toAssignable(node.argument, binding)
+  } else if (node.type == "AssignmentExpression") {
+    node.type = "AssignmentPattern"
+    delete node.operator
+  } else {
+    return this.dummyIdent()
+  }
+  return node
+}
+
+lp$2.toAssignableList = function(exprList, binding) {
+  var this$1 = this;
+
+  for (var i = 0; i < exprList.length; i++)
+    exprList[i] = this$1.toAssignable(exprList[i], binding)
+  return exprList
+}
+
+lp$2.parseFunctionParams = function(params) {
+  params = this.parseExprList(__acorn.tokTypes.parenR)
+  return this.toAssignableList(params, true)
+}
+
+lp$2.parseMethod = function(isGenerator, isAsync) {
+  var node = this.startNode(), oldInAsync = this.inAsync
+  this.initFunction(node)
+  if (this.options.ecmaVersion >= 6)
+    node.generator = !!isGenerator
+  if (this.options.ecmaVersion >= 8)
+    node.async = !!isAsync
+  this.inAsync = node.async
+  node.params = this.parseFunctionParams()
+  node.expression = this.options.ecmaVersion >= 6 && this.tok.type !== __acorn.tokTypes.braceL
+  node.body = node.expression ? this.parseMaybeAssign() : this.parseBlock()
+  this.inAsync = oldInAsync
+  return this.finishNode(node, "FunctionExpression")
+}
+
+lp$2.parseArrowExpression = function(node, params, isAsync) {
+  var oldInAsync = this.inAsync
+  this.initFunction(node)
+  if (this.options.ecmaVersion >= 8)
+    node.async = !!isAsync
+  this.inAsync = node.async
+  node.params = this.toAssignableList(params, true)
+  node.expression = this.tok.type !== __acorn.tokTypes.braceL
+  node.body = node.expression ? this.parseMaybeAssign() : this.parseBlock()
+  this.inAsync = oldInAsync
+  return this.finishNode(node, "ArrowFunctionExpression")
+}
+
+lp$2.parseExprList = function(close, allowEmpty) {
+  var this$1 = this;
+
+  this.pushCx()
+  var indent = this.curIndent, line = this.curLineStart, elts = []
+  this.next() // Opening bracket
+  while (!this.closes(close, indent + 1, line)) {
+    if (this$1.eat(__acorn.tokTypes.comma)) {
+      elts.push(allowEmpty ? null : this$1.dummyIdent())
+      continue
+    }
+    var elt = this$1.parseMaybeAssign()
+    if (isDummy(elt)) {
+      if (this$1.closes(close, indent, line)) break
+      this$1.next()
+    } else {
+      elts.push(elt)
+    }
+    this$1.eat(__acorn.tokTypes.comma)
+  }
+  this.popCx()
+  if (!this.eat(close)) {
+    // If there is no closing brace, make the node span to the start
+    // of the next token (this is useful for Tern)
+    this.last.end = this.tok.start
+    if (this.options.locations) this.last.loc.end = this.tok.loc.start
+  }
+  return elts
+}
+
+lp$2.parseAwait = function() {
+  var node = this.startNode()
+  this.next()
+  node.argument = this.parseMaybeUnary()
+  return this.finishNode(node, "AwaitExpression")
+}
+
+// Acorn: Loose parser
+//
+// This module provides an alternative parser (`parse_dammit`) that
+// exposes that same interface as `parse`, but will try to parse
+// anything as JavaScript, repairing syntax error the best it can.
+// There are circumstances in which it will raise an error and give
+// up, but they are very rare. The resulting AST will be a mostly
+// valid JavaScript AST (as per the [Mozilla parser API][api], except
+// that:
+//
+// - Return outside functions is allowed
+//
+// - Label consistency (no conflicts, break only to existing labels)
+//   is not enforced.
+//
+// - Bogus Identifier nodes with a name of `"✖"` are inserted whenever
+//   the parser got too confused to return anything meaningful.
+//
+// [api]: https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API
+//
+// The expected use for this is to *first* try `acorn.parse`, and only
+// if that fails switch to `parse_dammit`. The loose parser might
+// parse badly indented code incorrectly, so **don't** use it as
+// your default parser.
+//
+// Quite a lot of acorn.js is duplicated here. The alternative was to
+// add a *lot* of extra cruft to that file, making it less readable
+// and slower. Copying and editing the code allowed me to make
+// invasive changes and simplifications without creating a complicated
+// tangle.
+
+__acorn.defaultOptions.tabSize = 4
+
+// eslint-disable-next-line camelcase
+function parse_dammit(input, options) {
+  var p = new LooseParser(input, options)
+  p.next()
+  return p.parseTopLevel()
+}
+
+__acorn.addLooseExports(parse_dammit, LooseParser, pluginsLoose)
+
+exports.parse_dammit = parse_dammit;
+exports.LooseParser = LooseParser;
+exports.pluginsLoose = pluginsLoose;
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+})));
+// clang-format on