@babel/plugin-transform-regenerator - npm Package Compare versions

Comparing version 8.0.0-alpha.17 to 8.0.0-beta.0

lib/index.js

 import { declare } from '@babel/helper-plugin-utils';
-import regeneratorTransform from 'regenerator-transform';
+import assert from 'node:assert';
+import { types } from '@babel/core';
 
+let currentTypes = null;
+function wrapWithTypes(types, fn) {
+  return function (...args) {
+    const oldTypes = currentTypes;
+    currentTypes = types;
+    try {
+      return fn.apply(this, args);
+    } finally {
+      currentTypes = oldTypes;
+    }
+  };
+}
+function getTypes() {
+  return currentTypes;
+}
+function isReference(path) {
+  return path.isReferenced() || path.parentPath.isAssignmentExpression({
+    left: path.node
+  });
+}
+function replaceWithOrRemove(path, replacement) {
+  if (replacement) {
+    path.replaceWith(replacement);
+  } else {
+    path.remove();
+  }
+}
+
+const hasOwn$1 = Object.prototype.hasOwnProperty;
+function hoist(funPath) {
+  const t = getTypes();
+  t.assertFunction(funPath.node);
+  const vars = {};
+  function varDeclToExpr({
+    node: vdec,
+    scope
+  }, includeIdentifiers) {
+    t.assertVariableDeclaration(vdec);
+    const exprs = [];
+    vdec.declarations.forEach(function (dec) {
+      vars[dec.id.name] = t.identifier(dec.id.name);
+      scope.removeBinding(dec.id.name);
+      if (dec.init) {
+        exprs.push(t.assignmentExpression("=", dec.id, dec.init));
+      } else if (includeIdentifiers) {
+        exprs.push(dec.id);
+      }
+    });
+    if (exprs.length === 0) return null;
+    if (exprs.length === 1) return exprs[0];
+    return t.sequenceExpression(exprs);
+  }
+  funPath.get("body").traverse({
+    VariableDeclaration: {
+      exit: function (path) {
+        const expr = varDeclToExpr(path, false);
+        if (expr === null) {
+          path.remove();
+        } else {
+          replaceWithOrRemove(path, t.expressionStatement(expr));
+        }
+        path.skip();
+      }
+    },
+    ForStatement: function (path) {
+      const init = path.get("init");
+      if (init.isVariableDeclaration()) {
+        replaceWithOrRemove(init, varDeclToExpr(init, false));
+      }
+    },
+    ForXStatement: function (path) {
+      const left = path.get("left");
+      if (left.isVariableDeclaration()) {
+        replaceWithOrRemove(left, varDeclToExpr(left, true));
+      }
+    },
+    FunctionDeclaration: function (path) {
+      const node = path.node;
+      vars[node.id.name] = node.id;
+      const assignment = t.expressionStatement(t.assignmentExpression("=", t.clone(node.id), t.functionExpression(path.scope.generateUidIdentifierBasedOnNode(node), node.params, node.body, node.generator, node.expression)));
+      if (path.parentPath.isBlockStatement()) {
+        path.parentPath.unshiftContainer("body", assignment);
+        path.remove();
+      } else {
+        replaceWithOrRemove(path, assignment);
+      }
+      path.scope.removeBinding(node.id.name);
+      path.skip();
+    },
+    FunctionExpression: function (path) {
+      path.skip();
+    },
+    ArrowFunctionExpression: function (path) {
+      path.skip();
+    }
+  });
+  const paramNames = {};
+  funPath.get("params").forEach(function (paramPath) {
+    const param = paramPath.node;
+    if (t.isIdentifier(param)) {
+      paramNames[param.name] = param;
+    }
+  });
+  const declarations = [];
+  Object.keys(vars).forEach(function (name) {
+    if (!hasOwn$1.call(paramNames, name)) {
+      declarations.push(t.variableDeclarator(vars[name], null));
+    }
+  });
+  return declarations;
+}
+
+class Entry {}
+class FunctionEntry extends Entry {
+  returnLoc;
+  constructor(returnLoc) {
+    super();
+    this.returnLoc = returnLoc;
+  }
+}
+class LoopEntry extends Entry {
+  breakLoc;
+  continueLoc;
+  label;
+  constructor(breakLoc, continueLoc, label = null) {
+    super();
+    this.breakLoc = breakLoc;
+    this.continueLoc = continueLoc;
+    this.label = label;
+  }
+}
+class SwitchEntry extends Entry {
+  breakLoc;
+  constructor(breakLoc) {
+    super();
+    this.breakLoc = breakLoc;
+  }
+}
+class TryEntry extends Entry {
+  firstLoc;
+  catchEntry;
+  finallyEntry;
+  constructor(firstLoc, catchEntry = null, finallyEntry = null) {
+    super();
+    assert.ok(catchEntry || finallyEntry);
+    this.firstLoc = firstLoc;
+    this.catchEntry = catchEntry;
+    this.finallyEntry = finallyEntry;
+  }
+}
+class CatchEntry extends Entry {
+  firstLoc;
+  paramId;
+  constructor(firstLoc, paramId) {
+    super();
+    this.firstLoc = firstLoc;
+    this.paramId = paramId;
+  }
+}
+class FinallyEntry extends Entry {
+  firstLoc;
+  afterLoc;
+  constructor(firstLoc, afterLoc) {
+    super();
+    this.firstLoc = firstLoc;
+    this.afterLoc = afterLoc;
+  }
+}
+class LabeledEntry extends Entry {
+  breakLoc;
+  label;
+  constructor(breakLoc, label) {
+    super();
+    this.breakLoc = breakLoc;
+    this.label = label;
+  }
+}
+class LeapManager {
+  emitter;
+  entryStack;
+  constructor(emitter) {
+    this.emitter = emitter;
+    this.entryStack = [new FunctionEntry(emitter.finalLoc)];
+  }
+  withEntry(entry, callback) {
+    this.entryStack.push(entry);
+    try {
+      callback.call(this.emitter);
+    } finally {
+      const popped = this.entryStack.pop();
+      assert.strictEqual(popped, entry);
+    }
+  }
+  _findLeapLocation(property, label) {
+    for (let i = this.entryStack.length - 1; i >= 0; --i) {
+      const entry = this.entryStack[i];
+      const loc = entry[property];
+      if (loc) {
+        if (label) {
+          if (entry.label && entry.label.name === label.name) {
+            return loc;
+          }
+        } else if (entry instanceof LabeledEntry) ; else {
+          return loc;
+        }
+      }
+    }
+    return null;
+  }
+  getBreakLoc(label) {
+    return this._findLeapLocation("breakLoc", label);
+  }
+  getContinueLoc(label) {
+    return this._findLeapLocation("continueLoc", label);
+  }
+}
+
+const mMap = new WeakMap();
+function m(node) {
+  if (!mMap.has(node)) {
+    mMap.set(node, {});
+  }
+  return mMap.get(node);
+}
+const hasOwn = Object.prototype.hasOwnProperty;
+function makePredicate(propertyName, knownTypes) {
+  function onlyChildren(node) {
+    const t = getTypes();
+    t.assertNode(node);
+    let result = false;
+    function check(child) {
+      if (result) ; else if (Array.isArray(child)) {
+        child.some(check);
+      } else if (t.isNode(child)) {
+        assert.strictEqual(result, false);
+        result = predicate(child);
+      }
+      return result;
+    }
+    const keys = t.VISITOR_KEYS[node.type];
+    if (keys) {
+      for (let i = 0; i < keys.length; i++) {
+        const key = keys[i];
+        const child = node[key];
+        check(child);
+      }
+    }
+    return result;
+  }
+  function predicate(node) {
+    getTypes().assertNode(node);
+    const meta = m(node);
+    if (hasOwn.call(meta, propertyName)) return meta[propertyName];
+    if (hasOwn.call(opaqueTypes, node.type)) return meta[propertyName] = false;
+    if (hasOwn.call(knownTypes, node.type)) return meta[propertyName] = true;
+    return meta[propertyName] = onlyChildren(node);
+  }
+  predicate.onlyChildren = onlyChildren;
+  return predicate;
+}
+const opaqueTypes = {
+  FunctionExpression: true,
+  ArrowFunctionExpression: true
+};
+const sideEffectTypes = {
+  CallExpression: true,
+  ForInStatement: true,
+  UnaryExpression: true,
+  BinaryExpression: true,
+  AssignmentExpression: true,
+  UpdateExpression: true,
+  NewExpression: true
+};
+const leapTypes = {
+  YieldExpression: true,
+  BreakStatement: true,
+  ContinueStatement: true,
+  ReturnStatement: true,
+  ThrowStatement: true
+};
+for (const type in leapTypes) {
+  if (hasOwn.call(leapTypes, type)) {
+    sideEffectTypes[type] = leapTypes[type];
+  }
+}
+makePredicate("hasSideEffects", sideEffectTypes);
+const containsLeap = makePredicate("containsLeap", leapTypes);
+
+const PENDING_LOCATION = Number.MAX_VALUE;
+function getDeclError(node) {
+  return new Error("all declarations should have been transformed into " + "assignments before the Exploder began its work: " + JSON.stringify(node));
+}
+const catchParamVisitor = {
+  Identifier: function (path, state) {
+    if (path.node.name === state.catchParamName && isReference(path)) {
+      replaceWithOrRemove(path, state.getSafeParam());
+    }
+  },
+  Scope: function (path, state) {
+    if (path.scope.hasOwnBinding(state.catchParamName)) {
+      path.skip();
+    }
+  }
+};
+class Emitter {
+  nextTempId;
+  contextId;
+  index;
+  indexMap;
+  listing;
+  returns;
+  lastDefaultIndex;
+  marked;
+  insertedLocs;
+  finalLoc;
+  tryEntries;
+  leapManager;
+  scope;
+  vars;
+  pluginPass;
+  constructor(contextId, scope, vars, pluginPass) {
+    this.pluginPass = pluginPass;
+    this.scope = scope;
+    this.vars = vars;
+    this.nextTempId = 0;
+    this.contextId = contextId;
+    this.listing = [];
+    this.index = 0;
+    this.indexMap = new Map([[0, 0]]);
+    this.returns = new Set();
+    this.marked = [true];
+    this.insertedLocs = new Set();
+    this.finalLoc = this.loc();
+    this.tryEntries = [];
+    this.leapManager = new LeapManager(this);
+  }
+  loc() {
+    const l = types.numericLiteral(PENDING_LOCATION);
+    this.insertedLocs.add(l);
+    return l;
+  }
+  getInsertedLocs() {
+    return this.insertedLocs;
+  }
+  getContextId() {
+    return types.cloneNode(this.contextId);
+  }
+  getIndex() {
+    if (!this.indexMap.has(this.listing.length)) {
+      this.indexMap.set(this.listing.length, ++this.index);
+    }
+    return this.index;
+  }
+  mark(loc) {
+    if (loc.value === PENDING_LOCATION) {
+      loc.value = this.getIndex();
+    } else {
+      assert.strictEqual(loc.value, this.index);
+    }
+    this.marked[this.listing.length] = true;
+    return loc;
+  }
+  emit(node) {
+    if (types.isExpression(node)) {
+      node = types.expressionStatement(node);
+    }
+    types.assertStatement(node);
+    this.listing.push(node);
+  }
+  emitAssign(lhs, rhs) {
+    this.emit(this.assign(lhs, rhs));
+    return lhs;
+  }
+  assign(lhs, rhs) {
+    return types.expressionStatement(types.assignmentExpression("=", types.cloneNode(lhs), rhs));
+  }
+  contextProperty(name) {
+    const computed = name === "catch";
+    return types.memberExpression(this.getContextId(), computed ? types.stringLiteral(name) : types.identifier(name), !!computed);
+  }
+  clearPendingException(tryLoc, assignee) {
+    const catchCall = types.callExpression(this.contextProperty("catch"), [types.cloneNode(tryLoc)]);
+    if (assignee) {
+      this.emitAssign(assignee, catchCall);
+    } else {
+      this.emit(catchCall);
+    }
+  }
+  jump(toLoc) {
+    this.emitAssign(this.contextProperty("n"), toLoc);
+    this.emit(types.breakStatement());
+  }
+  jumpIf(test, toLoc) {
+    this.emit(types.ifStatement(test, types.blockStatement([this.assign(this.contextProperty("n"), toLoc), types.breakStatement()])));
+  }
+  jumpIfNot(test, toLoc) {
+    let negatedTest;
+    if (types.isUnaryExpression(test) && test.operator === "!") {
+      negatedTest = test.argument;
+    } else {
+      negatedTest = types.unaryExpression("!", test);
+    }
+    this.emit(types.ifStatement(negatedTest, types.blockStatement([this.assign(this.contextProperty("n"), toLoc), types.breakStatement()])));
+  }
+  makeContextTempVar() {
+    return this.contextProperty("t" + this.nextTempId++);
+  }
+  makeTempVar() {
+    const id = this.scope.generateUidIdentifier("t");
+    this.vars.push(types.variableDeclarator(id));
+    return types.cloneNode(id);
+  }
+  getContextFunction() {
+    return types.functionExpression(null, [this.getContextId()], types.blockStatement([this.getDispatchLoop()]), false, false);
+  }
+  getDispatchLoop() {
+    const self = this;
+    const cases = [];
+    let current;
+    let alreadyEnded = false;
+    self.listing.forEach(function (stmt, i) {
+      if (self.marked[i]) {
+        cases.push(types.switchCase(types.numericLiteral(self.indexMap.get(i)), current = []));
+        alreadyEnded = false;
+      }
+      if (!alreadyEnded) {
+        current.push(stmt);
+        if (types.isCompletionStatement(stmt)) alreadyEnded = true;
+      }
+    });
+    this.finalLoc.value = this.getIndex();
+    {
+      if (this.lastDefaultIndex === this.index || !this.returns.has(this.listing.length)) {
+        cases.push(types.switchCase(this.finalLoc, [types.returnStatement(types.callExpression(this.contextProperty("a"), [types.numericLiteral(2)]))]));
+      }
+    }
+    return types.whileStatement(types.numericLiteral(1), types.switchStatement(this.contextProperty("n"), cases));
+  }
+  getTryLocsList() {
+    if (this.tryEntries.length === 0) {
+      return null;
+    }
+    let lastLocValue = 0;
+    const arrayExpression = types.arrayExpression(this.tryEntries.map(function (tryEntry) {
+      const thisLocValue = tryEntry.firstLoc.value;
+      assert.ok(thisLocValue >= lastLocValue, "try entries out of order");
+      lastLocValue = thisLocValue;
+      const ce = tryEntry.catchEntry;
+      const fe = tryEntry.finallyEntry;
+      const locs = [tryEntry.firstLoc, ce ? ce.firstLoc : null];
+      if (fe) {
+        locs[2] = fe.firstLoc;
+        locs[3] = fe.afterLoc;
+      }
+      return types.arrayExpression(locs.map(loc => loc && types.cloneNode(loc)));
+    }));
+    {
+      arrayExpression.elements.reverse();
+    }
+    return arrayExpression;
+  }
+  explode(path, ignoreResult) {
+    const node = path.node;
+    const self = this;
+    if (types.isDeclaration(node)) throw getDeclError(node);
+    if (path.isStatement()) return self.explodeStatement(path);
+    if (path.isExpression()) return self.explodeExpression(path, ignoreResult);
+    switch (node.type) {
+      case "VariableDeclarator":
+        throw getDeclError(node);
+      case "ObjectProperty":
+      case "SwitchCase":
+      case "CatchClause":
+        throw new Error(node.type + " nodes should be handled by their parents");
+      default:
+        throw new Error("unknown Node of type " + JSON.stringify(node.type));
+    }
+  }
+  explodeStatement(path, labelId = null) {
+    const stmt = path.node;
+    const self = this;
+    let before, after, head;
+    if (path.isBlockStatement()) {
+      path.get("body").forEach(function (path) {
+        self.explodeStatement(path);
+      });
+      return;
+    }
+    if (!containsLeap(stmt)) {
+      self.emit(stmt);
+      return;
+    }
+    switch (path.type) {
+      case "ExpressionStatement":
+        self.explodeExpression(path.get("expression"), true);
+        break;
+      case "LabeledStatement":
+        after = this.loc();
+        self.leapManager.withEntry(new LabeledEntry(after, path.node.label), function () {
+          self.explodeStatement(path.get("body"), path.node.label);
+        });
+        self.mark(after);
+        break;
+      case "WhileStatement":
+        before = this.loc();
+        after = this.loc();
+        self.mark(before);
+        self.jumpIfNot(self.explodeExpression(path.get("test")), after);
+        self.leapManager.withEntry(new LoopEntry(after, before, labelId), function () {
+          self.explodeStatement(path.get("body"));
+        });
+        self.jump(before);
+        self.mark(after);
+        break;
+      case "DoWhileStatement":
+        const first = this.loc();
+        const test = this.loc();
+        after = this.loc();
+        self.mark(first);
+        self.leapManager.withEntry(new LoopEntry(after, test, labelId), function () {
+          self.explode(path.get("body"));
+        });
+        self.mark(test);
+        self.jumpIf(self.explodeExpression(path.get("test")), first);
+        self.mark(after);
+        break;
+      case "ForStatement":
+        head = this.loc();
+        const update = this.loc();
+        after = this.loc();
+        if (path.node.init) {
+          self.explode(path.get("init"), true);
+        }
+        self.mark(head);
+        if (path.node.test) {
+          self.jumpIfNot(self.explodeExpression(path.get("test")), after);
+        }
+        self.leapManager.withEntry(new LoopEntry(after, update, labelId), function () {
+          self.explodeStatement(path.get("body"));
+        });
+        self.mark(update);
+        if (path.node.update) {
+          self.explode(path.get("update"), true);
+        }
+        self.jump(head);
+        self.mark(after);
+        break;
+      case "TypeCastExpression":
+        return self.explodeExpression(path.get("expression"));
+      case "ForInStatement":
+        head = this.loc();
+        after = this.loc();
+        const keyIterNextFn = self.makeTempVar();
+        const helper = this.pluginPass.addHelper("regeneratorKeys");
+        self.emitAssign(keyIterNextFn, types.callExpression(helper, [self.explodeExpression(path.get("right"))]));
+        self.mark(head);
+        const keyInfoTmpVar = self.makeTempVar();
+        self.jumpIf(types.memberExpression(types.assignmentExpression("=", keyInfoTmpVar, types.callExpression(types.cloneNode(keyIterNextFn), [])), types.identifier("done"), false), after);
+        self.emitAssign(path.node.left, types.memberExpression(types.cloneNode(keyInfoTmpVar), types.identifier("value"), false));
+        self.leapManager.withEntry(new LoopEntry(after, head, labelId), function () {
+          self.explodeStatement(path.get("body"));
+        });
+        self.jump(head);
+        self.mark(after);
+        break;
+      case "BreakStatement":
+        self.emitAbruptCompletion({
+          type: 3,
+          target: self.leapManager.getBreakLoc(path.node.label)
+        });
+        break;
+      case "ContinueStatement":
+        self.emitAbruptCompletion({
+          type: 3,
+          target: self.leapManager.getContinueLoc(path.node.label)
+        });
+        break;
+      case "SwitchStatement":
+        const disc = self.emitAssign(self.makeTempVar(), self.explodeExpression(path.get("discriminant")));
+        after = this.loc();
+        const defaultLoc = this.loc();
+        let condition = defaultLoc;
+        const caseLocs = [];
+        const cases = path.node.cases || [];
+        for (let i = cases.length - 1; i >= 0; --i) {
+          const c = cases[i];
+          if (c.test) {
+            condition = types.conditionalExpression(types.binaryExpression("===", types.cloneNode(disc), c.test), caseLocs[i] = this.loc(), condition);
+          } else {
+            caseLocs[i] = defaultLoc;
+          }
+        }
+        const discriminant = path.get("discriminant");
+        replaceWithOrRemove(discriminant, condition);
+        self.jump(self.explodeExpression(discriminant));
+        self.leapManager.withEntry(new SwitchEntry(after), function () {
+          path.get("cases").forEach(function (casePath) {
+            const i = casePath.key;
+            self.mark(caseLocs[i]);
+            casePath.get("consequent").forEach(function (path) {
+              self.explodeStatement(path);
+            });
+          });
+        });
+        self.mark(after);
+        if (defaultLoc.value === PENDING_LOCATION) {
+          self.mark(defaultLoc);
+          assert.strictEqual(after.value, defaultLoc.value);
+          this.lastDefaultIndex = this.index;
+        }
+        break;
+      case "IfStatement":
+        const elseLoc = path.node.alternate && this.loc();
+        after = this.loc();
+        self.jumpIfNot(self.explodeExpression(path.get("test")), elseLoc || after);
+        self.explodeStatement(path.get("consequent"));
+        if (elseLoc) {
+          self.jump(after);
+          self.mark(elseLoc);
+          self.explodeStatement(path.get("alternate"));
+        }
+        self.mark(after);
+        break;
+      case "ReturnStatement":
+        self.emitAbruptCompletion({
+          type: 2,
+          value: self.explodeExpression(path.get("argument"))
+        });
+        break;
+      case "WithStatement":
+        throw new Error("WithStatement not supported in generator functions.");
+      case "TryStatement":
+        after = this.loc();
+        const handler = path.node.handler;
+        const catchLoc = handler && this.loc();
+        const catchEntry = catchLoc && new CatchEntry(catchLoc, handler.param);
+        const finallyLoc = path.node.finalizer && this.loc();
+        const finallyEntry = finallyLoc && new FinallyEntry(finallyLoc, after);
+        const tryEntry = new TryEntry(self.getUnmarkedCurrentLoc(), catchEntry, finallyEntry);
+        self.tryEntries.push(tryEntry);
+        self.updateContextPrevLoc(tryEntry.firstLoc);
+        self.leapManager.withEntry(tryEntry, () => {
+          self.explodeStatement(path.get("block"));
+          if (catchLoc) {
+            if (finallyLoc) {
+              self.jump(finallyLoc);
+            } else {
+              self.jump(after);
+            }
+            self.updateContextPrevLoc(self.mark(catchLoc));
+            const bodyPath = path.get("handler.body");
+            const safeParam = self.makeTempVar();
+            {
+              this.emitAssign(safeParam, self.contextProperty("v"));
+            }
+            bodyPath.traverse(catchParamVisitor, {
+              getSafeParam: () => types.cloneNode(safeParam),
+              catchParamName: handler.param.name
+            });
+            self.leapManager.withEntry(catchEntry, function () {
+              self.explodeStatement(bodyPath);
+            });
+          }
+          if (finallyLoc) {
+            self.updateContextPrevLoc(self.mark(finallyLoc));
+            self.leapManager.withEntry(finallyEntry, function () {
+              self.explodeStatement(path.get("finalizer"));
+            });
+            self.emit(types.returnStatement(types.callExpression(self.contextProperty("f"), [finallyEntry.firstLoc])));
+          }
+        });
+        self.mark(after);
+        break;
+      case "ThrowStatement":
+        self.emit(types.throwStatement(self.explodeExpression(path.get("argument"))));
+        break;
+      case "ClassDeclaration":
+        self.emit(self.explodeClass(path));
+        break;
+      default:
+        throw new Error("unknown Statement of type " + JSON.stringify(stmt.type));
+    }
+  }
+  emitAbruptCompletion(record) {
+    const abruptArgs = [types.numericLiteral(record.type)];
+    if (record.type === 3) {
+      abruptArgs[1] = this.insertedLocs.has(record.target) ? record.target : types.cloneNode(record.target);
+    } else if (record.type === 2) {
+      if (record.value) {
+        abruptArgs[1] = types.cloneNode(record.value);
+      }
+    }
+    this.emit(types.returnStatement(types.callExpression(this.contextProperty("a"), abruptArgs)));
+    if (record.type === 2) {
+      this.returns.add(this.listing.length);
+    }
+  }
+  getUnmarkedCurrentLoc() {
+    return types.numericLiteral(this.getIndex());
+  }
+  updateContextPrevLoc(loc) {
+    if (loc) {
+      if (loc.value === PENDING_LOCATION) {
+        loc.value = this.getIndex();
+      } else {
+        assert.strictEqual(loc.value, this.index);
+      }
+    } else {
+      loc = this.getUnmarkedCurrentLoc();
+    }
+    this.emitAssign(this.contextProperty("p"), loc);
+  }
+  explodeViaTempVar(tempVar, childPath, hasLeapingChildren, ignoreChildResult) {
+    assert.ok(!ignoreChildResult || !tempVar, "Ignoring the result of a child expression but forcing it to " + "be assigned to a temporary variable?");
+    let result = this.explodeExpression(childPath, ignoreChildResult);
+    if (ignoreChildResult) ; else if (tempVar || hasLeapingChildren && !types.isLiteral(result)) {
+      result = this.emitAssign(tempVar || this.makeTempVar(), result);
+    }
+    return result;
+  }
+  explodeExpression(path, ignoreResult) {
+    const expr = path.node;
+    if (!expr) {
+      return expr;
+    }
+    const self = this;
+    let result;
+    let after;
+    function finish(expr) {
+      if (ignoreResult) {
+        self.emit(expr);
+      }
+      return expr;
+    }
+    if (!containsLeap(expr)) {
+      return finish(expr);
+    }
+    const hasLeapingChildren = containsLeap.onlyChildren(expr);
+    switch (path.type) {
+      case "MemberExpression":
+        return finish(types.memberExpression(self.explodeExpression(path.get("object")), path.node.computed ? self.explodeViaTempVar(null, path.get("property"), hasLeapingChildren) : path.node.property, path.node.computed));
+      case "CallExpression":
+        const calleePath = path.get("callee");
+        const argsPath = path.get("arguments");
+        let newCallee;
+        let newArgs;
+        const hasLeapingArgs = argsPath.some(argPath => containsLeap(argPath.node));
+        let injectFirstArg = null;
+        if (types.isMemberExpression(calleePath.node)) {
+          if (hasLeapingArgs) {
+            const newObject = self.explodeViaTempVar(self.makeTempVar(), calleePath.get("object"), hasLeapingChildren);
+            const newProperty = calleePath.node.computed ? self.explodeViaTempVar(null, calleePath.get("property"), hasLeapingChildren) : calleePath.node.property;
+            injectFirstArg = newObject;
+            newCallee = types.memberExpression(types.memberExpression(types.cloneNode(newObject), newProperty, calleePath.node.computed), types.identifier("call"), false);
+          } else {
+            newCallee = self.explodeExpression(calleePath);
+          }
+        } else {
+          newCallee = self.explodeViaTempVar(null, calleePath, hasLeapingChildren);
+          if (types.isMemberExpression(newCallee)) {
+            newCallee = types.sequenceExpression([types.numericLiteral(0), types.cloneNode(newCallee)]);
+          }
+        }
+        if (hasLeapingArgs) {
+          newArgs = argsPath.map(argPath => self.explodeViaTempVar(null, argPath, hasLeapingChildren));
+          if (injectFirstArg) newArgs.unshift(injectFirstArg);
+          newArgs = newArgs.map(arg => types.cloneNode(arg));
+        } else {
+          newArgs = path.node.arguments;
+        }
+        return finish(types.callExpression(newCallee, newArgs));
+      case "NewExpression":
+        return finish(types.newExpression(self.explodeViaTempVar(null, path.get("callee"), hasLeapingChildren), path.get("arguments").map(function (argPath) {
+          return self.explodeViaTempVar(null, argPath, hasLeapingChildren);
+        })));
+      case "ObjectExpression":
+        return finish(types.objectExpression(path.get("properties").map(function (propPath) {
+          if (propPath.isObjectProperty()) {
+            return types.objectProperty(propPath.node.key, self.explodeViaTempVar(null, propPath.get("value"), hasLeapingChildren), propPath.node.computed);
+          } else {
+            return propPath.node;
+          }
+        })));
+      case "ArrayExpression":
+        return finish(types.arrayExpression(path.get("elements").map(function (elemPath) {
+          if (!elemPath.node) {
+            return null;
+          }
+          if (elemPath.isSpreadElement()) {
+            return types.spreadElement(self.explodeViaTempVar(null, elemPath.get("argument"), hasLeapingChildren));
+          } else {
+            return self.explodeViaTempVar(null, elemPath, hasLeapingChildren);
+          }
+        })));
+      case "SequenceExpression":
+        const lastIndex = path.node.expressions.length - 1;
+        path.get("expressions").forEach(function (exprPath) {
+          if (exprPath.key === lastIndex) {
+            result = self.explodeExpression(exprPath, ignoreResult);
+          } else {
+            self.explodeExpression(exprPath, true);
+          }
+        });
+        return result;
+      case "LogicalExpression":
+        after = this.loc();
+        if (!ignoreResult) {
+          result = self.makeTempVar();
+        }
+        const left = self.explodeViaTempVar(result, path.get("left"), hasLeapingChildren);
+        if (path.node.operator === "&&") {
+          self.jumpIfNot(left, after);
+        } else {
+          assert.strictEqual(path.node.operator, "||");
+          self.jumpIf(left, after);
+        }
+        self.explodeViaTempVar(result, path.get("right"), hasLeapingChildren, ignoreResult);
+        self.mark(after);
+        return result;
+      case "ConditionalExpression":
+        const elseLoc = this.loc();
+        after = this.loc();
+        const test = self.explodeExpression(path.get("test"));
+        self.jumpIfNot(test, elseLoc);
+        if (!ignoreResult) {
+          result = self.makeTempVar();
+        }
+        self.explodeViaTempVar(result, path.get("consequent"), hasLeapingChildren, ignoreResult);
+        self.jump(after);
+        self.mark(elseLoc);
+        self.explodeViaTempVar(result, path.get("alternate"), hasLeapingChildren, ignoreResult);
+        self.mark(after);
+        return result;
+      case "UnaryExpression":
+        return finish(types.unaryExpression(path.node.operator, self.explodeExpression(path.get("argument")), !!path.node.prefix));
+      case "BinaryExpression":
+        return finish(types.binaryExpression(path.node.operator, self.explodeViaTempVar(null, path.get("left"), hasLeapingChildren), self.explodeViaTempVar(null, path.get("right"), hasLeapingChildren)));
+      case "AssignmentExpression":
+        if (path.node.operator === "=") {
+          return finish(types.assignmentExpression(path.node.operator, self.explodeExpression(path.get("left")), self.explodeExpression(path.get("right"))));
+        }
+        const lhs = self.explodeExpression(path.get("left"));
+        const temp = self.emitAssign(self.makeTempVar(), lhs);
+        return finish(types.assignmentExpression("=", types.cloneNode(lhs), types.assignmentExpression(path.node.operator, types.cloneNode(temp), self.explodeExpression(path.get("right")))));
+      case "UpdateExpression":
+        return finish(types.updateExpression(path.node.operator, self.explodeExpression(path.get("argument")), path.node.prefix));
+      case "YieldExpression":
+        after = this.loc();
+        const arg = path.node.argument && self.explodeExpression(path.get("argument"));
+        if (arg && path.node.delegate) {
+          {
+            const ret = types.returnStatement(types.callExpression(self.contextProperty("d"), [types.callExpression(this.pluginPass.addHelper("regeneratorValues"), [arg]), after]));
+            ret.loc = expr.loc;
+            self.emit(ret);
+            self.mark(after);
+            return self.contextProperty("v");
+          }
+        }
+        self.emitAssign(self.contextProperty("n"), after);
+        const ret = types.returnStatement(types.cloneNode(arg) || null);
+        ret.loc = expr.loc;
+        self.emit(ret);
+        self.mark(after);
+        return self.contextProperty("v");
+      case "ClassExpression":
+        return finish(self.explodeClass(path));
+      default:
+        throw new Error("unknown Expression of type " + JSON.stringify(expr.type));
+    }
+  }
+  explodeClass(path) {
+    const explodingChildren = [];
+    if (path.node.superClass) {
+      explodingChildren.push(path.get("superClass"));
+    }
+    path.get("body.body").forEach(member => {
+      if (member.node.computed) {
+        explodingChildren.push(member.get("key"));
+      }
+    });
+    const hasLeapingChildren = explodingChildren.some(child => containsLeap(child));
+    for (let i = 0; i < explodingChildren.length; i++) {
+      const child = explodingChildren[i];
+      const isLast = i === explodingChildren.length - 1;
+      if (isLast) {
+        child.replaceWith(this.explodeExpression(child));
+      } else {
+        child.replaceWith(this.explodeViaTempVar(null, child, hasLeapingChildren));
+      }
+    }
+    return path.node;
+  }
+}
+
+function replaceShorthandObjectMethod(path) {
+  const t = getTypes();
+  if (!path.node || !t.isFunction(path.node)) {
+    throw new Error("replaceShorthandObjectMethod can only be called on Function AST node paths.");
+  }
+  if (!t.isObjectMethod(path.node)) {
+    return path;
+  }
+  if (!path.node.generator) {
+    return path;
+  }
+  const parameters = path.node.params.map(function (param) {
+    return t.cloneDeep(param);
+  });
+  const functionExpression = t.functionExpression(null, parameters, t.cloneDeep(path.node.body), path.node.generator, path.node.async);
+  replaceWithOrRemove(path, t.objectProperty(t.cloneDeep(path.node.key), functionExpression, path.node.computed, false));
+  return path.get("value");
+}
+
+const getVisitor = t => ({
+  Method(path, state) {
+    const node = path.node;
+    if (!shouldRegenerate(node, state)) return;
+    const container = t.functionExpression(null, [], t.cloneNode(node.body, false), node.generator, node.async);
+    path.get("body").set("body", [t.returnStatement(t.callExpression(container, []))]);
+    node.async = false;
+    node.generator = false;
+    path.get("body.body.0.argument.callee").unwrapFunctionEnvironment();
+  },
+  Function: {
+    exit: wrapWithTypes(t, function (path, state) {
+      let node = path.node;
+      if (!shouldRegenerate(node, state)) return;
+      path = replaceShorthandObjectMethod(path);
+      node = path.node;
+      const contextId = path.scope.generateUidIdentifier("context");
+      const argsId = path.scope.generateUidIdentifier("args");
+      path.ensureBlock();
+      const bodyBlockPath = path.get("body");
+      if (node.async) {
+        bodyBlockPath.traverse(awaitVisitor, this);
+      }
+      bodyBlockPath.traverse(functionSentVisitor, {
+        context: contextId,
+        pluginPass: this
+      });
+      const outerBody = [];
+      const innerBody = [];
+      bodyBlockPath.get("body").forEach(function (childPath) {
+        const node = childPath.node;
+        if (t.isExpressionStatement(node) && t.isStringLiteral(node.expression)) {
+          outerBody.push(node);
+        } else if (node?._blockHoist != null) {
+          outerBody.push(node);
+        } else {
+          innerBody.push(node);
+        }
+      });
+      if (outerBody.length > 0) {
+        bodyBlockPath.node.body = innerBody;
+      }
+      const outerFnExpr = getOuterFnExpr(this, path);
+      t.assertIdentifier(node.id);
+      const vars = hoist(path);
+      const context = {
+        usesThis: false,
+        usesArguments: false,
+        getArgsId: () => t.clone(argsId)
+      };
+      path.traverse(argumentsThisVisitor, context);
+      if (context.usesArguments) {
+        vars.push(t.variableDeclarator(t.clone(argsId), t.identifier("arguments")));
+      }
+      const emitter = new Emitter(contextId, path.scope, vars, this);
+      emitter.explode(path.get("body"));
+      if (vars.length > 0) {
+        outerBody.push(t.variableDeclaration("var", vars));
+      }
+      const wrapArgs = [emitter.getContextFunction()];
+      const tryLocsList = emitter.getTryLocsList();
+      if (node.generator) {
+        wrapArgs.push(outerFnExpr);
+      } else if (context.usesThis || tryLocsList || node.async) {
+        wrapArgs.push(t.nullLiteral());
+      }
+      if (context.usesThis) {
+        wrapArgs.push(t.thisExpression());
+      } else if (tryLocsList || node.async) {
+        wrapArgs.push(t.nullLiteral());
+      }
+      if (tryLocsList) {
+        wrapArgs.push(tryLocsList);
+      } else if (node.async) {
+        wrapArgs.push(t.nullLiteral());
+      }
+      if (node.async) {
+        let currentScope = path.scope;
+        do {
+          if (currentScope.hasOwnBinding("Promise")) currentScope.rename("Promise");
+        } while (currentScope = currentScope.parent);
+        wrapArgs.push(t.identifier("Promise"));
+      }
+      const wrapCall = t.callExpression(!node.async ? t.memberExpression(t.callExpression(this.addHelper("regenerator"), []), t.identifier("w")) : node.generator ? this.addHelper("regeneratorAsyncGen") : this.addHelper("regeneratorAsync"), wrapArgs);
+      outerBody.push(t.returnStatement(wrapCall));
+      node.body = t.blockStatement(outerBody);
+      path.get("body.body").forEach(p => p.scope.registerDeclaration(p));
+      const oldDirectives = bodyBlockPath.node.directives;
+      if (oldDirectives) {
+        node.body.directives = oldDirectives;
+      }
+      const wasGeneratorFunction = node.generator;
+      if (wasGeneratorFunction) {
+        node.generator = false;
+      }
+      if (node.async) {
+        node.async = false;
+      }
+      if (wasGeneratorFunction && t.isExpression(node)) {
+        replaceWithOrRemove(path, t.callExpression(t.memberExpression(t.callExpression(this.addHelper("regenerator"), []), t.identifier("m")), [node]));
+        path.addComment("leading", "#__PURE__");
+      }
+      const insertedLocs = emitter.getInsertedLocs();
+      path.traverse({
+        NumericLiteral(path) {
+          if (!insertedLocs.has(path.node)) {
+            return;
+          }
+          path.replaceWith(t.numericLiteral(path.node.value));
+        }
+      });
+      path.requeue();
+    })
+  }
+});
+function shouldRegenerate(node, state) {
+  if (node.generator) {
+    if (node.async) {
+      return state.opts.asyncGenerators !== false;
+    } else {
+      return state.opts.generators !== false;
+    }
+  } else if (node.async) {
+    return state.opts.async !== false;
+  } else {
+    return false;
+  }
+}
+function getOuterFnExpr(state, funPath) {
+  const t = getTypes();
+  const node = funPath.node;
+  t.assertFunction(node);
+  if (!node.id) {
+    node.id = funPath.scope.parent.generateUidIdentifier("callee");
+  }
+  if (node.generator && t.isFunctionDeclaration(node)) {
+    return getMarkedFunctionId(state, funPath);
+  }
+  return t.clone(node.id);
+}
+const markInfo = new WeakMap();
+function getMarkInfo(node) {
+  if (!markInfo.has(node)) {
+    markInfo.set(node, {});
+  }
+  return markInfo.get(node);
+}
+function getMarkedFunctionId(state, funPath) {
+  const t = getTypes();
+  const node = funPath.node;
+  t.assertIdentifier(node.id);
+  const blockPath = funPath.findParent(function (path) {
+    return path.isProgram() || path.isBlockStatement();
+  });
+  if (!blockPath) {
+    return node.id;
+  }
+  const block = blockPath.node;
+  assert.ok(Array.isArray(block.body));
+  const info = getMarkInfo(block);
+  if (!info.decl) {
+    info.decl = t.variableDeclaration("var", []);
+    blockPath.unshiftContainer("body", info.decl);
+    info.declPath = blockPath.get("body.0");
+  }
+  assert.strictEqual(info.declPath.node, info.decl);
+  const markedId = blockPath.scope.generateUidIdentifier("marked");
+  const markCallExp = t.callExpression(t.memberExpression(t.callExpression(state.addHelper("regenerator"), []), t.identifier("m")), [t.clone(node.id)]);
+  const index = info.decl.declarations.push(t.variableDeclarator(markedId, markCallExp)) - 1;
+  const markCallExpPath = info.declPath.get("declarations." + index + ".init");
+  assert.strictEqual(markCallExpPath.node, markCallExp);
+  markCallExpPath.addComment("leading", "#__PURE__");
+  return t.clone(markedId);
+}
+const argumentsThisVisitor = {
+  "FunctionExpression|FunctionDeclaration|Method": function (path) {
+    path.skip();
+  },
+  Identifier: function (path, state) {
+    if (path.node.name === "arguments" && isReference(path)) {
+      replaceWithOrRemove(path, state.getArgsId());
+      state.usesArguments = true;
+    }
+  },
+  ThisExpression: function (path, state) {
+    state.usesThis = true;
+  }
+};
+const functionSentVisitor = {
+  MetaProperty(path, state) {
+    const {
+      node
+    } = path;
+    if (node.meta.name === "function" && node.property.name === "sent") {
+      const t = getTypes();
+      replaceWithOrRemove(path, t.memberExpression(t.clone(this.context), t.identifier("v")));
+    }
+  }
+};
+const awaitVisitor = {
+  Function: function (path) {
+    path.skip();
+  },
+  AwaitExpression: function (path) {
+    const t = getTypes();
+    const argument = path.node.argument;
+    const helper = this.addHelper("awaitAsyncGenerator");
+    replaceWithOrRemove(path, t.yieldExpression(t.callExpression(helper, [argument]), false));
+  }
+};
+
 var index = declare(({
   types: t,
+  traverse,
   assertVersion
 }) => {
-  assertVersion("8.0.0-alpha.17");
+  assertVersion("8.0.0-beta.0");
   return {
     name: "transform-regenerator",
-    inherits: regeneratorTransform.default,
-    visitor: {
-      CallExpression(path) {
-        const callee = path.get("callee");
-        if (!callee.isMemberExpression()) return;
-        const obj = callee.get("object");
-        if (obj.isIdentifier({
-          name: "regeneratorRuntime"
-        })) {
-          const helper = this.addHelper("regeneratorRuntime");
-          obj.replaceWith(t.callExpression(helper, []));
-        }
-      }
-    }
+    visitor: getVisitor(t)
   };
@@ -26,0 +1139,0 @@ });

LICENSE

 MIT License
 
 Copyright (c) 2014-present Sebastian McKenzie and other contributors
+Copyright (c) 2014-present Facebook, Inc.
 
@@ -5,0 +6,0 @@ Permission is hereby granted, free of charge, to any person obtaining

package.json

@@ -5,3 +5,3 @@ {
   "description": "Explode async and generator functions into a state machine.",
-  "version": "8.0.0-alpha.17",
+  "version": "8.0.0-beta.0",
   "homepage": "https://babel.dev/docs/en/next/babel-plugin-transform-regenerator",
@@ -15,4 +15,3 @@ "repository": {
   "dependencies": {
-    "@babel/helper-plugin-utils": "^8.0.0-alpha.17",
-    "regenerator-transform": "^0.15.2"
+    "@babel/helper-plugin-utils": "^8.0.0-beta.0"
   },
@@ -24,10 +23,23 @@ "license": "MIT",
   "peerDependencies": {
-    "@babel/core": "^8.0.0-alpha.17"
+    "@babel/core": "^8.0.0-beta.0"
   },
   "devDependencies": {
-    "@babel/core": "^8.0.0-alpha.17",
-    "@babel/helper-plugin-test-runner": "^8.0.0-alpha.17"
+    "@babel/core": "^8.0.0-beta.0",
+    "@babel/helper-check-duplicate-nodes": "^8.0.0-beta.0",
+    "@babel/helper-plugin-test-runner": "^8.0.0-beta.0",
+    "@babel/plugin-proposal-function-sent": "^8.0.0-beta.0",
+    "@babel/plugin-transform-arrow-functions": "^8.0.0-beta.0",
+    "@babel/plugin-transform-block-scoping": "^8.0.0-beta.0",
+    "@babel/plugin-transform-classes": "^8.0.0-beta.0",
+    "@babel/plugin-transform-for-of": "^8.0.0-beta.0",
+    "@babel/plugin-transform-modules-commonjs": "^8.0.0-beta.0",
+    "@babel/plugin-transform-parameters": "^8.0.0-beta.0",
+    "@babel/plugin-transform-runtime": "^8.0.0-beta.0",
+    "babel-plugin-polyfill-regenerator": "^0.6.1",
+    "mocha": "^10.0.0",
+    "recast": "^0.23.3",
+    "uglify-js": "^3.14.0"
   },
   "engines": {
-    "node": "^18.20.0 || ^20.17.0 || >=22.8.0"
+    "node": "^20.19.0 || >=22.12.0"
   },
@@ -34,0 +46,0 @@ "exports": {

New alerts

Major refactor

Supply chain risk

Package has recently undergone a major refactor. It may be unstable or indicate significant internal changes. Use caution when updating to versions that include significant changes.

Found 1 instance in 1 package

Improved metrics

Total package byte prevSize

180472

2722.96%

Dependency count

2

-33.33%

Lines of code

1137

3567.74%

Worsened metrics

Dev dependency count

15

650%

Number of medium supply chain risk alerts

1

Infinity%

Dependency changes

• - Removed

  regenerator-transform@^0.15.2

• - Removed

  @babel/runtime@7.28.6
  (transitive)

• - Removed

  regenerator-transform@0.15.2
  (transitive)

• Updated

  @babel/helper-plugin-utils@^8.0.0-beta.0