0.2.0 - Mid migration

web/node_modules/@babel/plugin-transform-block-scoping/LICENSE

@@ -0,0 +1,22 @@
+MIT License
+
+Copyright (c) 2014-present Sebastian McKenzie and other contributors
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

web/node_modules/@babel/plugin-transform-block-scoping/README.md

@@ -0,0 +1,19 @@
+# @babel/plugin-transform-block-scoping
+
+> Compile ES2015 block scoping (const and let) to ES5
+
+See our website [@babel/plugin-transform-block-scoping](https://babeljs.io/docs/en/babel-plugin-transform-block-scoping) for more information.
+
+## Install
+
+Using npm:
+
+```sh
+npm install --save-dev @babel/plugin-transform-block-scoping
+```
+
+or using yarn:
+
+```sh
+yarn add @babel/plugin-transform-block-scoping --dev
+```

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

@@ -0,0 +1,763 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+
+var _helperPluginUtils = require("@babel/helper-plugin-utils");
+
+var _tdz = require("./tdz");
+
+var _core = require("@babel/core");
+
+const DONE = new WeakSet();
+
+var _default = (0, _helperPluginUtils.declare)((api, opts) => {
+  api.assertVersion(7);
+  const {
+    throwIfClosureRequired = false,
+    tdz: tdzEnabled = false
+  } = opts;
+
+  if (typeof throwIfClosureRequired !== "boolean") {
+    throw new Error(`.throwIfClosureRequired must be a boolean, or undefined`);
+  }
+
+  if (typeof tdzEnabled !== "boolean") {
+    throw new Error(`.tdz must be a boolean, or undefined`);
+  }
+
+  return {
+    name: "transform-block-scoping",
+    visitor: {
+      VariableDeclaration(path) {
+        const {
+          node,
+          parent,
+          scope
+        } = path;
+        if (!isBlockScoped(node)) return;
+        convertBlockScopedToVar(path, null, parent, scope, true);
+
+        if (node._tdzThis) {
+          const nodes = [node];
+
+          for (let i = 0; i < node.declarations.length; i++) {
+            const decl = node.declarations[i];
+
+            const assign = _core.types.assignmentExpression("=", _core.types.cloneNode(decl.id), decl.init || scope.buildUndefinedNode());
+
+            assign._ignoreBlockScopingTDZ = true;
+            nodes.push(_core.types.expressionStatement(assign));
+            decl.init = this.addHelper("temporalUndefined");
+          }
+
+          node._blockHoist = 2;
+
+          if (path.isCompletionRecord()) {
+            nodes.push(_core.types.expressionStatement(scope.buildUndefinedNode()));
+          }
+
+          path.replaceWithMultiple(nodes);
+        }
+      },
+
+      Loop(path, state) {
+        const {
+          parent,
+          scope
+        } = path;
+        path.ensureBlock();
+        const blockScoping = new BlockScoping(path, path.get("body"), parent, scope, throwIfClosureRequired, tdzEnabled, state);
+        const replace = blockScoping.run();
+        if (replace) path.replaceWith(replace);
+      },
+
+      CatchClause(path, state) {
+        const {
+          parent,
+          scope
+        } = path;
+        const blockScoping = new BlockScoping(null, path.get("body"), parent, scope, throwIfClosureRequired, tdzEnabled, state);
+        blockScoping.run();
+      },
+
+      "BlockStatement|SwitchStatement|Program"(path, state) {
+        if (!ignoreBlock(path)) {
+          const blockScoping = new BlockScoping(null, path, path.parent, path.scope, throwIfClosureRequired, tdzEnabled, state);
+          blockScoping.run();
+        }
+      }
+
+    }
+  };
+});
+
+exports.default = _default;
+
+function ignoreBlock(path) {
+  return _core.types.isLoop(path.parent) || _core.types.isCatchClause(path.parent);
+}
+
+const buildRetCheck = (0, _core.template)(`
+  if (typeof RETURN === "object") return RETURN.v;
+`);
+
+function isBlockScoped(node) {
+  if (!_core.types.isVariableDeclaration(node)) return false;
+  if (node[_core.types.BLOCK_SCOPED_SYMBOL]) return true;
+  if (node.kind !== "let" && node.kind !== "const") return false;
+  return true;
+}
+
+function isInLoop(path) {
+  const loopOrFunctionParent = path.find(path => path.isLoop() || path.isFunction());
+  return loopOrFunctionParent == null ? void 0 : loopOrFunctionParent.isLoop();
+}
+
+function convertBlockScopedToVar(path, node, parent, scope, moveBindingsToParent = false) {
+  if (!node) {
+    node = path.node;
+  }
+
+  if (isInLoop(path) && !_core.types.isFor(parent)) {
+    for (let i = 0; i < node.declarations.length; i++) {
+      const declar = node.declarations[i];
+      declar.init = declar.init || scope.buildUndefinedNode();
+    }
+  }
+
+  node[_core.types.BLOCK_SCOPED_SYMBOL] = true;
+  node.kind = "var";
+
+  if (moveBindingsToParent) {
+    const parentScope = scope.getFunctionParent() || scope.getProgramParent();
+
+    for (const name of Object.keys(path.getBindingIdentifiers())) {
+      const binding = scope.getOwnBinding(name);
+      if (binding) binding.kind = "var";
+      scope.moveBindingTo(name, parentScope);
+    }
+  }
+}
+
+function isVar(node) {
+  return _core.types.isVariableDeclaration(node, {
+    kind: "var"
+  }) && !isBlockScoped(node);
+}
+
+const letReferenceBlockVisitor = _core.traverse.visitors.merge([{
+  Loop: {
+    enter(path, state) {
+      state.loopDepth++;
+    },
+
+    exit(path, state) {
+      state.loopDepth--;
+    }
+
+  },
+
+  FunctionParent(path, state) {
+    if (state.loopDepth > 0) {
+      path.traverse(letReferenceFunctionVisitor, state);
+    } else {
+      path.traverse(_tdz.visitor, state);
+    }
+
+    return path.skip();
+  }
+
+}, _tdz.visitor]);
+
+const letReferenceFunctionVisitor = _core.traverse.visitors.merge([{
+  ReferencedIdentifier(path, state) {
+    const ref = state.letReferences.get(path.node.name);
+    if (!ref) return;
+    const localBinding = path.scope.getBindingIdentifier(path.node.name);
+    if (localBinding && localBinding !== ref) return;
+    state.closurify = true;
+  }
+
+}, _tdz.visitor]);
+
+const hoistVarDeclarationsVisitor = {
+  enter(path, self) {
+    if (path.isForStatement()) {
+      const {
+        node
+      } = path;
+
+      if (isVar(node.init)) {
+        const nodes = self.pushDeclar(node.init);
+
+        if (nodes.length === 1) {
+          node.init = nodes[0];
+        } else {
+          node.init = _core.types.sequenceExpression(nodes);
+        }
+      }
+    } else if (path.isForInStatement() || path.isForOfStatement()) {
+      const {
+        node
+      } = path;
+
+      if (isVar(node.left)) {
+        self.pushDeclar(node.left);
+        node.left = node.left.declarations[0].id;
+      }
+    } else if (isVar(path.node)) {
+      path.replaceWithMultiple(self.pushDeclar(path.node).map(expr => _core.types.expressionStatement(expr)));
+    } else if (path.isFunction()) {
+      return path.skip();
+    }
+  }
+
+};
+const loopLabelVisitor = {
+  LabeledStatement({
+    node
+  }, state) {
+    state.innerLabels.push(node.label.name);
+  }
+
+};
+const continuationVisitor = {
+  enter(path, state) {
+    if (path.isAssignmentExpression() || path.isUpdateExpression()) {
+      for (const name of Object.keys(path.getBindingIdentifiers())) {
+        if (state.outsideReferences.get(name) !== path.scope.getBindingIdentifier(name)) {
+          continue;
+        }
+
+        state.reassignments[name] = true;
+      }
+    } else if (path.isReturnStatement()) {
+      state.returnStatements.push(path);
+    }
+  }
+
+};
+
+function loopNodeTo(node) {
+  if (_core.types.isBreakStatement(node)) {
+    return "break";
+  } else if (_core.types.isContinueStatement(node)) {
+    return "continue";
+  }
+}
+
+const loopVisitor = {
+  Loop(path, state) {
+    const oldIgnoreLabeless = state.ignoreLabeless;
+    state.ignoreLabeless = true;
+    path.traverse(loopVisitor, state);
+    state.ignoreLabeless = oldIgnoreLabeless;
+    path.skip();
+  },
+
+  Function(path) {
+    path.skip();
+  },
+
+  SwitchCase(path, state) {
+    const oldInSwitchCase = state.inSwitchCase;
+    state.inSwitchCase = true;
+    path.traverse(loopVisitor, state);
+    state.inSwitchCase = oldInSwitchCase;
+    path.skip();
+  },
+
+  "BreakStatement|ContinueStatement|ReturnStatement"(path, state) {
+    const {
+      node,
+      scope
+    } = path;
+    if (node[this.LOOP_IGNORE]) return;
+    let replace;
+    let loopText = loopNodeTo(node);
+
+    if (loopText) {
+      if (_core.types.isReturnStatement(node)) {
+        throw new Error("Internal error: unexpected return statement with `loopText`");
+      }
+
+      if (node.label) {
+        if (state.innerLabels.indexOf(node.label.name) >= 0) {
+          return;
+        }
+
+        loopText = `${loopText}|${node.label.name}`;
+      } else {
+        if (state.ignoreLabeless) return;
+        if (_core.types.isBreakStatement(node) && state.inSwitchCase) return;
+      }
+
+      state.hasBreakContinue = true;
+      state.map[loopText] = node;
+      replace = _core.types.stringLiteral(loopText);
+    }
+
+    if (_core.types.isReturnStatement(node)) {
+      state.hasReturn = true;
+      replace = _core.types.objectExpression([_core.types.objectProperty(_core.types.identifier("v"), node.argument || scope.buildUndefinedNode())]);
+    }
+
+    if (replace) {
+      replace = _core.types.returnStatement(replace);
+      replace[this.LOOP_IGNORE] = true;
+      path.skip();
+      path.replaceWith(_core.types.inherits(replace, node));
+    }
+  }
+
+};
+
+function isStrict(path) {
+  return !!path.find(({
+    node
+  }) => {
+    if (_core.types.isProgram(node)) {
+      if (node.sourceType === "module") return true;
+    } else if (!_core.types.isBlockStatement(node)) return false;
+
+    return node.directives.some(directive => directive.value.value === "use strict");
+  });
+}
+
+class BlockScoping {
+  constructor(loopPath, blockPath, parent, scope, throwIfClosureRequired, tdzEnabled, state) {
+    this.parent = void 0;
+    this.state = void 0;
+    this.scope = void 0;
+    this.throwIfClosureRequired = void 0;
+    this.tdzEnabled = void 0;
+    this.blockPath = void 0;
+    this.block = void 0;
+    this.outsideLetReferences = void 0;
+    this.hasLetReferences = void 0;
+    this.letReferences = void 0;
+    this.body = void 0;
+    this.loopParent = void 0;
+    this.loopLabel = void 0;
+    this.loopPath = void 0;
+    this.loop = void 0;
+    this.has = void 0;
+    this.parent = parent;
+    this.scope = scope;
+    this.state = state;
+    this.throwIfClosureRequired = throwIfClosureRequired;
+    this.tdzEnabled = tdzEnabled;
+    this.blockPath = blockPath;
+    this.block = blockPath.node;
+    this.outsideLetReferences = new Map();
+    this.hasLetReferences = false;
+    this.letReferences = new Map();
+    this.body = [];
+
+    if (loopPath) {
+      this.loopParent = loopPath.parent;
+      this.loopLabel = _core.types.isLabeledStatement(this.loopParent) && this.loopParent.label;
+      this.loopPath = loopPath;
+      this.loop = loopPath.node;
+    }
+  }
+
+  run() {
+    const block = this.block;
+    if (DONE.has(block)) return;
+    DONE.add(block);
+    const needsClosure = this.getLetReferences();
+    this.checkConstants();
+
+    if (_core.types.isFunction(this.parent) || _core.types.isProgram(this.block)) {
+      this.updateScopeInfo();
+      return;
+    }
+
+    if (!this.hasLetReferences) return;
+
+    if (needsClosure) {
+      this.wrapClosure();
+    } else {
+      this.remap();
+    }
+
+    this.updateScopeInfo(needsClosure);
+
+    if (this.loopLabel && !_core.types.isLabeledStatement(this.loopParent)) {
+      return _core.types.labeledStatement(this.loopLabel, this.loop);
+    }
+  }
+
+  checkConstants() {
+    const scope = this.scope;
+    const state = this.state;
+
+    for (const name of Object.keys(scope.bindings)) {
+      const binding = scope.bindings[name];
+      if (binding.kind !== "const") continue;
+
+      for (const violation of binding.constantViolations) {
+        const readOnlyError = state.addHelper("readOnlyError");
+
+        const throwNode = _core.types.callExpression(readOnlyError, [_core.types.stringLiteral(name)]);
+
+        if (violation.isAssignmentExpression()) {
+          const {
+            operator
+          } = violation.node;
+
+          if (operator === "=") {
+            violation.replaceWith(_core.types.sequenceExpression([violation.get("right").node, throwNode]));
+          } else if (["&&=", "||=", "??="].includes(operator)) {
+            violation.replaceWith(_core.types.logicalExpression(operator.slice(0, -1), violation.get("left").node, _core.types.sequenceExpression([violation.get("right").node, throwNode])));
+          } else {
+            violation.replaceWith(_core.types.sequenceExpression([_core.types.binaryExpression(operator.slice(0, -1), violation.get("left").node, violation.get("right").node), throwNode]));
+          }
+        } else if (violation.isUpdateExpression()) {
+          violation.replaceWith(_core.types.sequenceExpression([_core.types.unaryExpression("+", violation.get("argument").node), throwNode]));
+        } else if (violation.isForXStatement()) {
+          violation.ensureBlock();
+          violation.get("left").replaceWith(_core.types.variableDeclaration("var", [_core.types.variableDeclarator(violation.scope.generateUidIdentifier(name))]));
+          violation.node.body.body.unshift(_core.types.expressionStatement(throwNode));
+        }
+      }
+    }
+  }
+
+  updateScopeInfo(wrappedInClosure) {
+    const blockScope = this.blockPath.scope;
+    const parentScope = blockScope.getFunctionParent() || blockScope.getProgramParent();
+    const letRefs = this.letReferences;
+
+    for (const key of letRefs.keys()) {
+      const ref = letRefs.get(key);
+      const binding = blockScope.getBinding(ref.name);
+      if (!binding) continue;
+
+      if (binding.kind === "let" || binding.kind === "const") {
+        binding.kind = "var";
+
+        if (wrappedInClosure) {
+          if (blockScope.hasOwnBinding(ref.name)) {
+            blockScope.removeBinding(ref.name);
+          }
+        } else {
+          blockScope.moveBindingTo(ref.name, parentScope);
+        }
+      }
+    }
+  }
+
+  remap() {
+    const letRefs = this.letReferences;
+    const outsideLetRefs = this.outsideLetReferences;
+    const scope = this.scope;
+    const blockPathScope = this.blockPath.scope;
+
+    for (const key of letRefs.keys()) {
+      const ref = letRefs.get(key);
+
+      if (scope.parentHasBinding(key) || scope.hasGlobal(key)) {
+        const binding = scope.getOwnBinding(key);
+
+        if (binding) {
+          const parentBinding = scope.parent.getOwnBinding(key);
+
+          if (binding.kind === "hoisted" && !binding.path.node.async && !binding.path.node.generator && (!parentBinding || isVar(parentBinding.path.parent)) && !isStrict(binding.path.parentPath)) {
+            continue;
+          }
+
+          scope.rename(ref.name);
+        }
+
+        if (blockPathScope.hasOwnBinding(key)) {
+          blockPathScope.rename(ref.name);
+        }
+      }
+    }
+
+    for (const key of outsideLetRefs.keys()) {
+      const ref = letRefs.get(key);
+
+      if (isInLoop(this.blockPath) && blockPathScope.hasOwnBinding(key)) {
+        blockPathScope.rename(ref.name);
+      }
+    }
+  }
+
+  wrapClosure() {
+    if (this.throwIfClosureRequired) {
+      throw this.blockPath.buildCodeFrameError("Compiling let/const in this block would add a closure " + "(throwIfClosureRequired).");
+    }
+
+    const block = this.block;
+    const outsideRefs = this.outsideLetReferences;
+
+    if (this.loop) {
+      for (const name of Array.from(outsideRefs.keys())) {
+        const id = outsideRefs.get(name);
+
+        if (this.scope.hasGlobal(id.name) || this.scope.parentHasBinding(id.name)) {
+          outsideRefs.delete(id.name);
+          this.letReferences.delete(id.name);
+          this.scope.rename(id.name);
+          this.letReferences.set(id.name, id);
+          outsideRefs.set(id.name, id);
+        }
+      }
+    }
+
+    this.has = this.checkLoop();
+    this.hoistVarDeclarations();
+    const args = Array.from(outsideRefs.values(), node => _core.types.cloneNode(node));
+    const params = args.map(id => _core.types.cloneNode(id));
+    const isSwitch = this.blockPath.isSwitchStatement();
+
+    const fn = _core.types.functionExpression(null, params, _core.types.blockStatement(isSwitch ? [block] : block.body));
+
+    this.addContinuations(fn);
+
+    let call = _core.types.callExpression(_core.types.nullLiteral(), args);
+
+    let basePath = ".callee";
+
+    const hasYield = _core.traverse.hasType(fn.body, "YieldExpression", _core.types.FUNCTION_TYPES);
+
+    if (hasYield) {
+      fn.generator = true;
+      call = _core.types.yieldExpression(call, true);
+      basePath = ".argument" + basePath;
+    }
+
+    const hasAsync = _core.traverse.hasType(fn.body, "AwaitExpression", _core.types.FUNCTION_TYPES);
+
+    if (hasAsync) {
+      fn.async = true;
+      call = _core.types.awaitExpression(call);
+      basePath = ".argument" + basePath;
+    }
+
+    let placeholderPath;
+    let index;
+
+    if (this.has.hasReturn || this.has.hasBreakContinue) {
+      const ret = this.scope.generateUid("ret");
+      this.body.push(_core.types.variableDeclaration("var", [_core.types.variableDeclarator(_core.types.identifier(ret), call)]));
+      placeholderPath = "declarations.0.init" + basePath;
+      index = this.body.length - 1;
+      this.buildHas(ret);
+    } else {
+      this.body.push(_core.types.expressionStatement(call));
+      placeholderPath = "expression" + basePath;
+      index = this.body.length - 1;
+    }
+
+    let callPath;
+
+    if (isSwitch) {
+      const {
+        parentPath,
+        listKey,
+        key
+      } = this.blockPath;
+      this.blockPath.replaceWithMultiple(this.body);
+      callPath = parentPath.get(listKey)[key + index];
+    } else {
+      block.body = this.body;
+      callPath = this.blockPath.get("body")[index];
+    }
+
+    const placeholder = callPath.get(placeholderPath);
+    let fnPath;
+
+    if (this.loop) {
+      const loopId = this.scope.generateUid("loop");
+      const p = this.loopPath.insertBefore(_core.types.variableDeclaration("var", [_core.types.variableDeclarator(_core.types.identifier(loopId), fn)]));
+      placeholder.replaceWith(_core.types.identifier(loopId));
+      fnPath = p[0].get("declarations.0.init");
+    } else {
+      placeholder.replaceWith(fn);
+      fnPath = placeholder;
+    }
+
+    fnPath.unwrapFunctionEnvironment();
+  }
+
+  addContinuations(fn) {
+    const state = {
+      reassignments: {},
+      returnStatements: [],
+      outsideReferences: this.outsideLetReferences
+    };
+    this.scope.traverse(fn, continuationVisitor, state);
+
+    for (let i = 0; i < fn.params.length; i++) {
+      const param = fn.params[i];
+      if (!state.reassignments[param.name]) continue;
+      const paramName = param.name;
+      const newParamName = this.scope.generateUid(param.name);
+      fn.params[i] = _core.types.identifier(newParamName);
+      this.scope.rename(paramName, newParamName, fn);
+      state.returnStatements.forEach(returnStatement => {
+        returnStatement.insertBefore(_core.types.expressionStatement(_core.types.assignmentExpression("=", _core.types.identifier(paramName), _core.types.identifier(newParamName))));
+      });
+      fn.body.body.push(_core.types.expressionStatement(_core.types.assignmentExpression("=", _core.types.identifier(paramName), _core.types.identifier(newParamName))));
+    }
+  }
+
+  getLetReferences() {
+    const block = this.block;
+    const declarators = [];
+
+    if (this.loop) {
+      const init = this.loop.left || this.loop.init;
+
+      if (isBlockScoped(init)) {
+        declarators.push(init);
+
+        const names = _core.types.getBindingIdentifiers(init);
+
+        for (const name of Object.keys(names)) {
+          this.outsideLetReferences.set(name, names[name]);
+        }
+      }
+    }
+
+    const addDeclarationsFromChild = (path, node) => {
+      node = node || path.node;
+
+      if (_core.types.isClassDeclaration(node) || _core.types.isFunctionDeclaration(node) || isBlockScoped(node)) {
+        if (isBlockScoped(node)) {
+          convertBlockScopedToVar(path, node, block, this.scope);
+        }
+
+        if (node.declarations) {
+          for (let i = 0; i < node.declarations.length; i++) {
+            declarators.push(node.declarations[i]);
+          }
+        } else {
+          declarators.push(node);
+        }
+      }
+
+      if (_core.types.isLabeledStatement(node)) {
+        addDeclarationsFromChild(path.get("body"), node.body);
+      }
+    };
+
+    if (block.body) {
+      const declarPaths = this.blockPath.get("body");
+
+      for (let i = 0; i < block.body.length; i++) {
+        addDeclarationsFromChild(declarPaths[i]);
+      }
+    }
+
+    if (block.cases) {
+      const declarPaths = this.blockPath.get("cases");
+
+      for (let i = 0; i < block.cases.length; i++) {
+        const consequents = block.cases[i].consequent;
+
+        for (let j = 0; j < consequents.length; j++) {
+          const declar = consequents[j];
+          addDeclarationsFromChild(declarPaths[i], declar);
+        }
+      }
+    }
+
+    for (let i = 0; i < declarators.length; i++) {
+      const declar = declarators[i];
+
+      const keys = _core.types.getBindingIdentifiers(declar, false, true);
+
+      for (const key of Object.keys(keys)) {
+        this.letReferences.set(key, keys[key]);
+      }
+
+      this.hasLetReferences = true;
+    }
+
+    if (!this.hasLetReferences) return;
+    const state = {
+      letReferences: this.letReferences,
+      closurify: false,
+      loopDepth: 0,
+      tdzEnabled: this.tdzEnabled,
+      addHelper: name => this.state.addHelper(name)
+    };
+
+    if (isInLoop(this.blockPath)) {
+      state.loopDepth++;
+    }
+
+    this.blockPath.traverse(letReferenceBlockVisitor, state);
+    return state.closurify;
+  }
+
+  checkLoop() {
+    const state = {
+      hasBreakContinue: false,
+      ignoreLabeless: false,
+      inSwitchCase: false,
+      innerLabels: [],
+      hasReturn: false,
+      isLoop: !!this.loop,
+      map: {},
+      LOOP_IGNORE: Symbol()
+    };
+    this.blockPath.traverse(loopLabelVisitor, state);
+    this.blockPath.traverse(loopVisitor, state);
+    return state;
+  }
+
+  hoistVarDeclarations() {
+    this.blockPath.traverse(hoistVarDeclarationsVisitor, this);
+  }
+
+  pushDeclar(node) {
+    const declars = [];
+
+    const names = _core.types.getBindingIdentifiers(node);
+
+    for (const name of Object.keys(names)) {
+      declars.push(_core.types.variableDeclarator(names[name]));
+    }
+
+    this.body.push(_core.types.variableDeclaration(node.kind, declars));
+    const replace = [];
+
+    for (let i = 0; i < node.declarations.length; i++) {
+      const declar = node.declarations[i];
+      if (!declar.init) continue;
+
+      const expr = _core.types.assignmentExpression("=", _core.types.cloneNode(declar.id), _core.types.cloneNode(declar.init));
+
+      replace.push(_core.types.inherits(expr, declar));
+    }
+
+    return replace;
+  }
+
+  buildHas(ret) {
+    const body = this.body;
+    const has = this.has;
+
+    if (has.hasBreakContinue) {
+      for (const key of Object.keys(has.map)) {
+        body.push(_core.types.ifStatement(_core.types.binaryExpression("===", _core.types.identifier(ret), _core.types.stringLiteral(key)), has.map[key]));
+      }
+    }
+
+    if (has.hasReturn) {
+      body.push(buildRetCheck({
+        RETURN: _core.types.identifier(ret)
+      }));
+    }
+  }
+
+}

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

@@ -0,0 +1,97 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.visitor = void 0;
+
+var _core = require("@babel/core");
+
+function getTDZStatus(refPath, bindingPath) {
+  const executionStatus = bindingPath._guessExecutionStatusRelativeTo(refPath);
+
+  if (executionStatus === "before") {
+    return "outside";
+  } else if (executionStatus === "after") {
+    return "inside";
+  } else {
+    return "maybe";
+  }
+}
+
+function buildTDZAssert(node, state) {
+  return _core.types.callExpression(state.addHelper("temporalRef"), [node, _core.types.stringLiteral(node.name)]);
+}
+
+function isReference(node, scope, state) {
+  const declared = state.letReferences.get(node.name);
+  if (!declared) return false;
+  return scope.getBindingIdentifier(node.name) === declared;
+}
+
+const visitedMaybeTDZNodes = new WeakSet();
+const visitor = {
+  ReferencedIdentifier(path, state) {
+    if (!state.tdzEnabled) return;
+    const {
+      node,
+      parent,
+      scope
+    } = path;
+    if (path.parentPath.isFor({
+      left: node
+    })) return;
+    if (!isReference(node, scope, state)) return;
+    const bindingPath = scope.getBinding(node.name).path;
+    if (bindingPath.isFunctionDeclaration()) return;
+    const status = getTDZStatus(path, bindingPath);
+    if (status === "outside") return;
+
+    if (status === "maybe") {
+      if (visitedMaybeTDZNodes.has(node)) {
+        return;
+      }
+
+      visitedMaybeTDZNodes.add(node);
+      const assert = buildTDZAssert(node, state);
+      bindingPath.parent._tdzThis = true;
+
+      if (path.parentPath.isUpdateExpression()) {
+        if (parent._ignoreBlockScopingTDZ) return;
+        path.parentPath.replaceWith(_core.types.sequenceExpression([assert, parent]));
+      } else {
+        path.replaceWith(assert);
+      }
+    } else if (status === "inside") {
+      path.replaceWith(_core.template.ast`${state.addHelper("tdz")}("${node.name}")`);
+    }
+  },
+
+  AssignmentExpression: {
+    exit(path, state) {
+      if (!state.tdzEnabled) return;
+      const {
+        node
+      } = path;
+      if (node._ignoreBlockScopingTDZ) return;
+      const nodes = [];
+      const ids = path.getBindingIdentifiers();
+
+      for (const name of Object.keys(ids)) {
+        const id = ids[name];
+
+        if (isReference(id, path.scope, state)) {
+          nodes.push(id);
+        }
+      }
+
+      if (nodes.length) {
+        node._ignoreBlockScopingTDZ = true;
+        nodes.push(node);
+        path.replaceWithMultiple(nodes.map(n => _core.types.expressionStatement(n)));
+      }
+    }
+
+  }
+};
+exports.visitor = visitor;

web/node_modules/@babel/plugin-transform-block-scoping/package.json

@@ -0,0 +1,34 @@
+{
+  "name": "@babel/plugin-transform-block-scoping",
+  "version": "7.15.3",
+  "description": "Compile ES2015 block scoping (const and let) to ES5",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/babel/babel.git",
+    "directory": "packages/babel-plugin-transform-block-scoping"
+  },
+  "homepage": "https://babel.dev/docs/en/next/babel-plugin-transform-block-scoping",
+  "license": "MIT",
+  "publishConfig": {
+    "access": "public"
+  },
+  "main": "./lib/index.js",
+  "dependencies": {
+    "@babel/helper-plugin-utils": "^7.14.5"
+  },
+  "keywords": [
+    "babel-plugin"
+  ],
+  "peerDependencies": {
+    "@babel/core": "^7.0.0-0"
+  },
+  "devDependencies": {
+    "@babel/core": "7.15.0",
+    "@babel/helper-plugin-test-runner": "7.14.5",
+    "@babel/traverse": "7.15.0"
+  },
+  "engines": {
+    "node": ">=6.9.0"
+  },
+  "author": "The Babel Team (https://babel.dev/team)"
+}