text: "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) {
      const {
        node,
        parent
      } = path;
  
      if (path.isForStatement()) {
        if (isVar(node.init, node)) {
          const nodes = self.pushDeclar(node.init);
  
          if (nodes.length === 1) {
            node.init = nodes[0];
          } else {
            node.init = _core.types.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(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 (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 (path.isReturnStatement()) {
        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 = 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()) {
            violation.get("right").replaceWith(_core.types.sequenceExpression([throwNode, violation.get("right").node]));
          } else if (violation.isUpdateExpression()) {
            violation.replaceWith(_core.types.sequenceExpression([throwNode, violation.node]));
          } else if (violation.isForXStatement()) {
            violation.ensureBlock();
            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;
      let 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);
          }
  
          declarators = declarators.concat(node.declarations || 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)
        }));
      }
    }
  
  }