initial commit taken from gitlab.lrz.de

node_modules/babel-plugin-transform-es2015-block-scoping/.npmignore

@@ -0,0 +1,4 @@
+node_modules
+*.log
+src
+test

node_modules/babel-plugin-transform-es2015-block-scoping/README.md

@@ -0,0 +1,61 @@
+# babel-plugin-transform-es2015-block-scoping
+
+> Compile ES2015 block scoping (const and let) to ES5
+
+## Installation
+
+```sh
+npm install --save-dev babel-plugin-transform-es2015-block-scoping
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+Without options:
+
+```json
+{
+  "plugins": ["transform-es2015-block-scoping"]
+}
+```
+
+With options:
+
+```json
+{
+  "plugins": [
+    ["transform-es2015-block-scoping", {
+      "throwIfClosureRequired": true
+    }]
+  ]
+}
+```
+
+### Via CLI
+
+```sh
+babel --plugins transform-es2015-block-scoping script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["transform-es2015-block-scoping"]
+});
+```
+
+## Options `throwIfClosureRequired`
+
+In cases such as the following it's impossible to rewrite let/const without adding an additional function and closure while transforming:
+
+```javascript
+for (let i = 0; i < 5; i++) {
+  setTimeout(() => console.log(i), 1);
+}
+```
+
+In extremely performance-sensitive code, this can be undesirable. If `"throwIfClosureRequired": true` is set, Babel throws when transforming these patterns instead of automatically adding an additional function.

node_modules/babel-plugin-transform-es2015-block-scoping/lib/index.js

@@ -0,0 +1,649 @@
+"use strict";
+
+exports.__esModule = true;
+
+var _symbol = require("babel-runtime/core-js/symbol");
+
+var _symbol2 = _interopRequireDefault(_symbol);
+
+var _create = require("babel-runtime/core-js/object/create");
+
+var _create2 = _interopRequireDefault(_create);
+
+var _classCallCheck2 = require("babel-runtime/helpers/classCallCheck");
+
+var _classCallCheck3 = _interopRequireDefault(_classCallCheck2);
+
+exports.default = function () {
+  return {
+    visitor: {
+      VariableDeclaration: function VariableDeclaration(path, file) {
+        var node = path.node,
+            parent = path.parent,
+            scope = path.scope;
+
+        if (!isBlockScoped(node)) return;
+        convertBlockScopedToVar(path, null, parent, scope, true);
+
+        if (node._tdzThis) {
+          var nodes = [node];
+
+          for (var i = 0; i < node.declarations.length; i++) {
+            var decl = node.declarations[i];
+            if (decl.init) {
+              var assign = t.assignmentExpression("=", decl.id, decl.init);
+              assign._ignoreBlockScopingTDZ = true;
+              nodes.push(t.expressionStatement(assign));
+            }
+            decl.init = file.addHelper("temporalUndefined");
+          }
+
+          node._blockHoist = 2;
+
+          if (path.isCompletionRecord()) {
+            nodes.push(t.expressionStatement(scope.buildUndefinedNode()));
+          }
+
+          path.replaceWithMultiple(nodes);
+        }
+      },
+      Loop: function Loop(path, file) {
+        var node = path.node,
+            parent = path.parent,
+            scope = path.scope;
+
+        t.ensureBlock(node);
+        var blockScoping = new BlockScoping(path, path.get("body"), parent, scope, file);
+        var replace = blockScoping.run();
+        if (replace) path.replaceWith(replace);
+      },
+      CatchClause: function CatchClause(path, file) {
+        var parent = path.parent,
+            scope = path.scope;
+
+        var blockScoping = new BlockScoping(null, path.get("body"), parent, scope, file);
+        blockScoping.run();
+      },
+      "BlockStatement|SwitchStatement|Program": function BlockStatementSwitchStatementProgram(path, file) {
+        if (!ignoreBlock(path)) {
+          var blockScoping = new BlockScoping(null, path, path.parent, path.scope, file);
+          blockScoping.run();
+        }
+      }
+    }
+  };
+};
+
+var _babelTraverse = require("babel-traverse");
+
+var _babelTraverse2 = _interopRequireDefault(_babelTraverse);
+
+var _tdz = require("./tdz");
+
+var _babelTypes = require("babel-types");
+
+var t = _interopRequireWildcard(_babelTypes);
+
+var _values = require("lodash/values");
+
+var _values2 = _interopRequireDefault(_values);
+
+var _extend = require("lodash/extend");
+
+var _extend2 = _interopRequireDefault(_extend);
+
+var _babelTemplate = require("babel-template");
+
+var _babelTemplate2 = _interopRequireDefault(_babelTemplate);
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function ignoreBlock(path) {
+  return t.isLoop(path.parent) || t.isCatchClause(path.parent);
+}
+
+var buildRetCheck = (0, _babelTemplate2.default)("\n  if (typeof RETURN === \"object\") return RETURN.v;\n");
+
+function isBlockScoped(node) {
+  if (!t.isVariableDeclaration(node)) return false;
+  if (node[t.BLOCK_SCOPED_SYMBOL]) return true;
+  if (node.kind !== "let" && node.kind !== "const") return false;
+  return true;
+}
+
+function convertBlockScopedToVar(path, node, parent, scope) {
+  var moveBindingsToParent = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : false;
+
+  if (!node) {
+    node = path.node;
+  }
+
+  if (!t.isFor(parent)) {
+    for (var i = 0; i < node.declarations.length; i++) {
+      var declar = node.declarations[i];
+      declar.init = declar.init || scope.buildUndefinedNode();
+    }
+  }
+
+  node[t.BLOCK_SCOPED_SYMBOL] = true;
+  node.kind = "var";
+
+  if (moveBindingsToParent) {
+    var parentScope = scope.getFunctionParent();
+    var ids = path.getBindingIdentifiers();
+    for (var name in ids) {
+      var binding = scope.getOwnBinding(name);
+      if (binding) binding.kind = "var";
+      scope.moveBindingTo(name, parentScope);
+    }
+  }
+}
+
+function isVar(node) {
+  return t.isVariableDeclaration(node, { kind: "var" }) && !isBlockScoped(node);
+}
+
+var letReferenceBlockVisitor = _babelTraverse2.default.visitors.merge([{
+  Loop: {
+    enter: function enter(path, state) {
+      state.loopDepth++;
+    },
+    exit: function exit(path, state) {
+      state.loopDepth--;
+    }
+  },
+  Function: function Function(path, state) {
+    if (state.loopDepth > 0) {
+      path.traverse(letReferenceFunctionVisitor, state);
+    }
+    return path.skip();
+  }
+}, _tdz.visitor]);
+
+var letReferenceFunctionVisitor = _babelTraverse2.default.visitors.merge([{
+  ReferencedIdentifier: function ReferencedIdentifier(path, state) {
+    var ref = state.letReferences[path.node.name];
+
+    if (!ref) return;
+
+    var localBinding = path.scope.getBindingIdentifier(path.node.name);
+    if (localBinding && localBinding !== ref) return;
+
+    state.closurify = true;
+  }
+}, _tdz.visitor]);
+
+var hoistVarDeclarationsVisitor = {
+  enter: function enter(path, self) {
+    var node = path.node,
+        parent = path.parent;
+
+
+    if (path.isForStatement()) {
+      if (isVar(node.init, node)) {
+        var nodes = self.pushDeclar(node.init);
+        if (nodes.length === 1) {
+          node.init = nodes[0];
+        } else {
+          node.init = t.sequenceExpression(nodes);
+        }
+      }
+    } else if (path.isFor()) {
+      if (isVar(node.left, node)) {
+        self.pushDeclar(node.left);
+        node.left = node.left.declarations[0].id;
+      }
+    } else if (isVar(node, parent)) {
+      path.replaceWithMultiple(self.pushDeclar(node).map(function (expr) {
+        return t.expressionStatement(expr);
+      }));
+    } else if (path.isFunction()) {
+      return path.skip();
+    }
+  }
+};
+
+var loopLabelVisitor = {
+  LabeledStatement: function LabeledStatement(_ref, state) {
+    var node = _ref.node;
+
+    state.innerLabels.push(node.label.name);
+  }
+};
+
+var continuationVisitor = {
+  enter: function enter(path, state) {
+    if (path.isAssignmentExpression() || path.isUpdateExpression()) {
+      var bindings = path.getBindingIdentifiers();
+      for (var name in bindings) {
+        if (state.outsideReferences[name] !== path.scope.getBindingIdentifier(name)) continue;
+        state.reassignments[name] = true;
+      }
+    }
+  }
+};
+
+function loopNodeTo(node) {
+  if (t.isBreakStatement(node)) {
+    return "break";
+  } else if (t.isContinueStatement(node)) {
+    return "continue";
+  }
+}
+
+var loopVisitor = {
+  Loop: function Loop(path, state) {
+    var oldIgnoreLabeless = state.ignoreLabeless;
+    state.ignoreLabeless = true;
+    path.traverse(loopVisitor, state);
+    state.ignoreLabeless = oldIgnoreLabeless;
+    path.skip();
+  },
+  Function: function Function(path) {
+    path.skip();
+  },
+  SwitchCase: function SwitchCase(path, state) {
+    var oldInSwitchCase = state.inSwitchCase;
+    state.inSwitchCase = true;
+    path.traverse(loopVisitor, state);
+    state.inSwitchCase = oldInSwitchCase;
+    path.skip();
+  },
+  "BreakStatement|ContinueStatement|ReturnStatement": function BreakStatementContinueStatementReturnStatement(path, state) {
+    var node = path.node,
+        parent = path.parent,
+        scope = path.scope;
+
+    if (node[this.LOOP_IGNORE]) return;
+
+    var replace = void 0;
+    var loopText = loopNodeTo(node);
+
+    if (loopText) {
+      if (node.label) {
+        if (state.innerLabels.indexOf(node.label.name) >= 0) {
+          return;
+        }
+
+        loopText = loopText + "|" + node.label.name;
+      } else {
+        if (state.ignoreLabeless) return;
+
+        if (state.inSwitchCase) return;
+
+        if (t.isBreakStatement(node) && t.isSwitchCase(parent)) return;
+      }
+
+      state.hasBreakContinue = true;
+      state.map[loopText] = node;
+      replace = t.stringLiteral(loopText);
+    }
+
+    if (path.isReturnStatement()) {
+      state.hasReturn = true;
+      replace = t.objectExpression([t.objectProperty(t.identifier("v"), node.argument || scope.buildUndefinedNode())]);
+    }
+
+    if (replace) {
+      replace = t.returnStatement(replace);
+      replace[this.LOOP_IGNORE] = true;
+      path.skip();
+      path.replaceWith(t.inherits(replace, node));
+    }
+  }
+};
+
+var BlockScoping = function () {
+  function BlockScoping(loopPath, blockPath, parent, scope, file) {
+    (0, _classCallCheck3.default)(this, BlockScoping);
+
+    this.parent = parent;
+    this.scope = scope;
+    this.file = file;
+
+    this.blockPath = blockPath;
+    this.block = blockPath.node;
+
+    this.outsideLetReferences = (0, _create2.default)(null);
+    this.hasLetReferences = false;
+    this.letReferences = (0, _create2.default)(null);
+    this.body = [];
+
+    if (loopPath) {
+      this.loopParent = loopPath.parent;
+      this.loopLabel = t.isLabeledStatement(this.loopParent) && this.loopParent.label;
+      this.loopPath = loopPath;
+      this.loop = loopPath.node;
+    }
+  }
+
+  BlockScoping.prototype.run = function run() {
+    var block = this.block;
+    if (block._letDone) return;
+    block._letDone = true;
+
+    var needsClosure = this.getLetReferences();
+
+    if (t.isFunction(this.parent) || t.isProgram(this.block)) {
+      this.updateScopeInfo();
+      return;
+    }
+
+    if (!this.hasLetReferences) return;
+
+    if (needsClosure) {
+      this.wrapClosure();
+    } else {
+      this.remap();
+    }
+
+    this.updateScopeInfo(needsClosure);
+
+    if (this.loopLabel && !t.isLabeledStatement(this.loopParent)) {
+      return t.labeledStatement(this.loopLabel, this.loop);
+    }
+  };
+
+  BlockScoping.prototype.updateScopeInfo = function updateScopeInfo(wrappedInClosure) {
+    var scope = this.scope;
+    var parentScope = scope.getFunctionParent();
+    var letRefs = this.letReferences;
+
+    for (var key in letRefs) {
+      var ref = letRefs[key];
+      var binding = scope.getBinding(ref.name);
+      if (!binding) continue;
+      if (binding.kind === "let" || binding.kind === "const") {
+        binding.kind = "var";
+
+        if (wrappedInClosure) {
+          scope.removeBinding(ref.name);
+        } else {
+          scope.moveBindingTo(ref.name, parentScope);
+        }
+      }
+    }
+  };
+
+  BlockScoping.prototype.remap = function remap() {
+    var letRefs = this.letReferences;
+    var scope = this.scope;
+
+    for (var key in letRefs) {
+      var ref = letRefs[key];
+
+      if (scope.parentHasBinding(key) || scope.hasGlobal(key)) {
+        if (scope.hasOwnBinding(key)) scope.rename(ref.name);
+
+        if (this.blockPath.scope.hasOwnBinding(key)) this.blockPath.scope.rename(ref.name);
+      }
+    }
+  };
+
+  BlockScoping.prototype.wrapClosure = function wrapClosure() {
+    if (this.file.opts.throwIfClosureRequired) {
+      throw this.blockPath.buildCodeFrameError("Compiling let/const in this block would add a closure " + "(throwIfClosureRequired).");
+    }
+    var block = this.block;
+
+    var outsideRefs = this.outsideLetReferences;
+
+    if (this.loop) {
+      for (var name in outsideRefs) {
+        var id = outsideRefs[name];
+
+        if (this.scope.hasGlobal(id.name) || this.scope.parentHasBinding(id.name)) {
+          delete outsideRefs[id.name];
+          delete this.letReferences[id.name];
+
+          this.scope.rename(id.name);
+
+          this.letReferences[id.name] = id;
+          outsideRefs[id.name] = id;
+        }
+      }
+    }
+
+    this.has = this.checkLoop();
+
+    this.hoistVarDeclarations();
+
+    var params = (0, _values2.default)(outsideRefs);
+    var args = (0, _values2.default)(outsideRefs);
+
+    var isSwitch = this.blockPath.isSwitchStatement();
+
+    var fn = t.functionExpression(null, params, t.blockStatement(isSwitch ? [block] : block.body));
+    fn.shadow = true;
+
+    this.addContinuations(fn);
+
+    var ref = fn;
+
+    if (this.loop) {
+      ref = this.scope.generateUidIdentifier("loop");
+      this.loopPath.insertBefore(t.variableDeclaration("var", [t.variableDeclarator(ref, fn)]));
+    }
+
+    var call = t.callExpression(ref, args);
+    var ret = this.scope.generateUidIdentifier("ret");
+
+    var hasYield = _babelTraverse2.default.hasType(fn.body, this.scope, "YieldExpression", t.FUNCTION_TYPES);
+    if (hasYield) {
+      fn.generator = true;
+      call = t.yieldExpression(call, true);
+    }
+
+    var hasAsync = _babelTraverse2.default.hasType(fn.body, this.scope, "AwaitExpression", t.FUNCTION_TYPES);
+    if (hasAsync) {
+      fn.async = true;
+      call = t.awaitExpression(call);
+    }
+
+    this.buildClosure(ret, call);
+
+    if (isSwitch) this.blockPath.replaceWithMultiple(this.body);else block.body = this.body;
+  };
+
+  BlockScoping.prototype.buildClosure = function buildClosure(ret, call) {
+    var has = this.has;
+    if (has.hasReturn || has.hasBreakContinue) {
+      this.buildHas(ret, call);
+    } else {
+      this.body.push(t.expressionStatement(call));
+    }
+  };
+
+  BlockScoping.prototype.addContinuations = function addContinuations(fn) {
+    var state = {
+      reassignments: {},
+      outsideReferences: this.outsideLetReferences
+    };
+
+    this.scope.traverse(fn, continuationVisitor, state);
+
+    for (var i = 0; i < fn.params.length; i++) {
+      var param = fn.params[i];
+      if (!state.reassignments[param.name]) continue;
+
+      var newParam = this.scope.generateUidIdentifier(param.name);
+      fn.params[i] = newParam;
+
+      this.scope.rename(param.name, newParam.name, fn);
+
+      fn.body.body.push(t.expressionStatement(t.assignmentExpression("=", param, newParam)));
+    }
+  };
+
+  BlockScoping.prototype.getLetReferences = function getLetReferences() {
+    var _this = this;
+
+    var block = this.block;
+
+    var declarators = [];
+
+    if (this.loop) {
+      var init = this.loop.left || this.loop.init;
+      if (isBlockScoped(init)) {
+        declarators.push(init);
+        (0, _extend2.default)(this.outsideLetReferences, t.getBindingIdentifiers(init));
+      }
+    }
+
+    var addDeclarationsFromChild = function addDeclarationsFromChild(path, node) {
+      node = node || path.node;
+      if (t.isClassDeclaration(node) || t.isFunctionDeclaration(node) || isBlockScoped(node)) {
+        if (isBlockScoped(node)) {
+          convertBlockScopedToVar(path, node, block, _this.scope);
+        }
+        declarators = declarators.concat(node.declarations || node);
+      }
+      if (t.isLabeledStatement(node)) {
+        addDeclarationsFromChild(path.get("body"), node.body);
+      }
+    };
+
+    if (block.body) {
+      for (var i = 0; i < block.body.length; i++) {
+        var declarPath = this.blockPath.get("body")[i];
+        addDeclarationsFromChild(declarPath);
+      }
+    }
+
+    if (block.cases) {
+      for (var _i = 0; _i < block.cases.length; _i++) {
+        var consequents = block.cases[_i].consequent;
+
+        for (var j = 0; j < consequents.length; j++) {
+          var _declarPath = this.blockPath.get("cases")[_i];
+          var declar = consequents[j];
+          addDeclarationsFromChild(_declarPath, declar);
+        }
+      }
+    }
+
+    for (var _i2 = 0; _i2 < declarators.length; _i2++) {
+      var _declar = declarators[_i2];
+
+      var keys = t.getBindingIdentifiers(_declar, false, true);
+      (0, _extend2.default)(this.letReferences, keys);
+      this.hasLetReferences = true;
+    }
+
+    if (!this.hasLetReferences) return;
+
+    var state = {
+      letReferences: this.letReferences,
+      closurify: false,
+      file: this.file,
+      loopDepth: 0
+    };
+
+    var loopOrFunctionParent = this.blockPath.find(function (path) {
+      return path.isLoop() || path.isFunction();
+    });
+    if (loopOrFunctionParent && loopOrFunctionParent.isLoop()) {
+      state.loopDepth++;
+    }
+
+    this.blockPath.traverse(letReferenceBlockVisitor, state);
+
+    return state.closurify;
+  };
+
+  BlockScoping.prototype.checkLoop = function checkLoop() {
+    var state = {
+      hasBreakContinue: false,
+      ignoreLabeless: false,
+      inSwitchCase: false,
+      innerLabels: [],
+      hasReturn: false,
+      isLoop: !!this.loop,
+      map: {},
+      LOOP_IGNORE: (0, _symbol2.default)()
+    };
+
+    this.blockPath.traverse(loopLabelVisitor, state);
+    this.blockPath.traverse(loopVisitor, state);
+
+    return state;
+  };
+
+  BlockScoping.prototype.hoistVarDeclarations = function hoistVarDeclarations() {
+    this.blockPath.traverse(hoistVarDeclarationsVisitor, this);
+  };
+
+  BlockScoping.prototype.pushDeclar = function pushDeclar(node) {
+    var declars = [];
+    var names = t.getBindingIdentifiers(node);
+    for (var name in names) {
+      declars.push(t.variableDeclarator(names[name]));
+    }
+
+    this.body.push(t.variableDeclaration(node.kind, declars));
+
+    var replace = [];
+
+    for (var i = 0; i < node.declarations.length; i++) {
+      var declar = node.declarations[i];
+      if (!declar.init) continue;
+
+      var expr = t.assignmentExpression("=", declar.id, declar.init);
+      replace.push(t.inherits(expr, declar));
+    }
+
+    return replace;
+  };
+
+  BlockScoping.prototype.buildHas = function buildHas(ret, call) {
+    var body = this.body;
+
+    body.push(t.variableDeclaration("var", [t.variableDeclarator(ret, call)]));
+
+    var retCheck = void 0;
+    var has = this.has;
+    var cases = [];
+
+    if (has.hasReturn) {
+      retCheck = buildRetCheck({
+        RETURN: ret
+      });
+    }
+
+    if (has.hasBreakContinue) {
+      for (var key in has.map) {
+        cases.push(t.switchCase(t.stringLiteral(key), [has.map[key]]));
+      }
+
+      if (has.hasReturn) {
+        cases.push(t.switchCase(null, [retCheck]));
+      }
+
+      if (cases.length === 1) {
+        var single = cases[0];
+        body.push(t.ifStatement(t.binaryExpression("===", ret, single.test), single.consequent[0]));
+      } else {
+        if (this.loop) {
+          for (var i = 0; i < cases.length; i++) {
+            var caseConsequent = cases[i].consequent[0];
+            if (t.isBreakStatement(caseConsequent) && !caseConsequent.label) {
+              caseConsequent.label = this.loopLabel = this.loopLabel || this.scope.generateUidIdentifier("loop");
+            }
+          }
+        }
+
+        body.push(t.switchStatement(ret, cases));
+      }
+    } else {
+      if (has.hasReturn) {
+        body.push(retCheck);
+      }
+    }
+  };
+
+  return BlockScoping;
+}();
+
+module.exports = exports["default"];

node_modules/babel-plugin-transform-es2015-block-scoping/lib/tdz.js

@@ -0,0 +1,97 @@
+"use strict";
+
+exports.__esModule = true;
+exports.visitor = undefined;
+
+var _babelTypes = require("babel-types");
+
+var t = _interopRequireWildcard(_babelTypes);
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
+
+function getTDZStatus(refPath, bindingPath) {
+  var executionStatus = bindingPath._guessExecutionStatusRelativeTo(refPath);
+
+  if (executionStatus === "before") {
+    return "inside";
+  } else if (executionStatus === "after") {
+    return "outside";
+  } else {
+    return "maybe";
+  }
+}
+
+function buildTDZAssert(node, file) {
+  return t.callExpression(file.addHelper("temporalRef"), [node, t.stringLiteral(node.name), file.addHelper("temporalUndefined")]);
+}
+
+function isReference(node, scope, state) {
+  var declared = state.letReferences[node.name];
+  if (!declared) return false;
+
+  return scope.getBindingIdentifier(node.name) === declared;
+}
+
+var visitor = exports.visitor = {
+  ReferencedIdentifier: function ReferencedIdentifier(path, state) {
+    if (!this.file.opts.tdz) return;
+
+    var node = path.node,
+        parent = path.parent,
+        scope = path.scope;
+
+
+    if (path.parentPath.isFor({ left: node })) return;
+    if (!isReference(node, scope, state)) return;
+
+    var bindingPath = scope.getBinding(node.name).path;
+
+    var status = getTDZStatus(path, bindingPath);
+    if (status === "inside") return;
+
+    if (status === "maybe") {
+      var assert = buildTDZAssert(node, state.file);
+
+      bindingPath.parent._tdzThis = true;
+
+      path.skip();
+
+      if (path.parentPath.isUpdateExpression()) {
+        if (parent._ignoreBlockScopingTDZ) return;
+        path.parentPath.replaceWith(t.sequenceExpression([assert, parent]));
+      } else {
+        path.replaceWith(assert);
+      }
+    } else if (status === "outside") {
+      path.replaceWith(t.throwStatement(t.inherits(t.newExpression(t.identifier("ReferenceError"), [t.stringLiteral(node.name + " is not defined - temporal dead zone")]), node)));
+    }
+  },
+
+
+  AssignmentExpression: {
+    exit: function exit(path, state) {
+      if (!this.file.opts.tdz) return;
+
+      var node = path.node;
+
+      if (node._ignoreBlockScopingTDZ) return;
+
+      var nodes = [];
+      var ids = path.getBindingIdentifiers();
+
+      for (var name in ids) {
+        var id = ids[name];
+
+        if (isReference(id, path.scope, state)) {
+          nodes.push(buildTDZAssert(id, state.file));
+        }
+      }
+
+      if (nodes.length) {
+        node._ignoreBlockScopingTDZ = true;
+        nodes.push(node);
+        path.replaceWithMultiple(nodes.map(t.expressionStatement));
+      }
+    }
+  }
+};

node_modules/babel-plugin-transform-es2015-block-scoping/package-lock.json

@@ -0,0 +1,13 @@
+{
+  "name": "babel-plugin-transform-es2015-block-scoping",
+  "version": "6.24.1",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "lodash": {
+      "version": "4.17.4",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.4.tgz",
+      "integrity": "sha1-eCA6TRwyiuHYbcpkYONptX9AVa4="
+    }
+  }
+}

node_modules/babel-plugin-transform-es2015-block-scoping/package.json

@@ -0,0 +1,93 @@
+{
+  "_args": [
+    [
+      "babel-plugin-transform-es2015-block-scoping@^6.8.0",
+      "/home/bernhard/freifunk-app/node_modules/babel-preset-fbjs"
+    ]
+  ],
+  "_from": "babel-plugin-transform-es2015-block-scoping@>=6.8.0 <7.0.0",
+  "_id": "babel-plugin-transform-es2015-block-scoping@6.26.0",
+  "_inCache": true,
+  "_installable": true,
+  "_location": "/babel-plugin-transform-es2015-block-scoping",
+  "_nodeVersion": "6.9.0",
+  "_npmOperationalInternal": {
+    "host": "s3://npm-registry-packages",
+    "tmp": "tmp/babel-plugin-transform-es2015-block-scoping-6.26.0.tgz_1502898859327_0.8509586888831109"
+  },
+  "_npmUser": {
+    "email": "hi@henryzoo.com",
+    "name": "hzoo"
+  },
+  "_npmVersion": "4.6.1",
+  "_phantomChildren": {},
+  "_requested": {
+    "name": "babel-plugin-transform-es2015-block-scoping",
+    "raw": "babel-plugin-transform-es2015-block-scoping@^6.8.0",
+    "rawSpec": "^6.8.0",
+    "scope": null,
+    "spec": ">=6.8.0 <7.0.0",
+    "type": "range"
+  },
+  "_requiredBy": [
+    "/babel-preset-fbjs",
+    "/babel-preset-react-native"
+  ],
+  "_resolved": "https://registry.npmjs.org/babel-plugin-transform-es2015-block-scoping/-/babel-plugin-transform-es2015-block-scoping-6.26.0.tgz",
+  "_shasum": "d70f5299c1308d05c12f463813b0a09e73b1895f",
+  "_shrinkwrap": null,
+  "_spec": "babel-plugin-transform-es2015-block-scoping@^6.8.0",
+  "_where": "/home/bernhard/freifunk-app/node_modules/babel-preset-fbjs",
+  "dependencies": {
+    "babel-runtime": "^6.26.0",
+    "babel-template": "^6.26.0",
+    "babel-traverse": "^6.26.0",
+    "babel-types": "^6.26.0",
+    "lodash": "^4.17.4"
+  },
+  "description": "Compile ES2015 block scoping (const and let) to ES5",
+  "devDependencies": {
+    "babel-helper-plugin-test-runner": "^6.24.1"
+  },
+  "directories": {},
+  "dist": {
+    "shasum": "d70f5299c1308d05c12f463813b0a09e73b1895f",
+    "tarball": "https://registry.npmjs.org/babel-plugin-transform-es2015-block-scoping/-/babel-plugin-transform-es2015-block-scoping-6.26.0.tgz"
+  },
+  "keywords": [
+    "babel-plugin"
+  ],
+  "license": "MIT",
+  "main": "lib/index.js",
+  "maintainers": [
+    {
+      "name": "thejameskyle",
+      "email": "me@thejameskyle.com"
+    },
+    {
+      "name": "sebmck",
+      "email": "sebmck@gmail.com"
+    },
+    {
+      "name": "danez",
+      "email": "daniel@tschinder.de"
+    },
+    {
+      "name": "hzoo",
+      "email": "hi@henryzoo.com"
+    },
+    {
+      "name": "loganfsmyth",
+      "email": "loganfsmyth@gmail.com"
+    }
+  ],
+  "name": "babel-plugin-transform-es2015-block-scoping",
+  "optionalDependencies": {},
+  "readme": "ERROR: No README data found!",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-es2015-block-scoping"
+  },
+  "scripts": {},
+  "version": "6.26.0"
+}