Implement @babel/plugin-bugfix-v8-spread-parameters-in-optional-chaining

Gulpfile.mjs

@@ -426,6 +426,7 @@ const libBundles = [
   "packages/babel-plugin-proposal-optional-chaining",
   "packages/babel-preset-typescript",
   "packages/babel-helper-member-expression-to-functions",
+  "packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining",
 ].map(src => ({
   src,
   format: "cjs",

lib/babel-packages.js.flow

@@ -166,7 +166,9 @@ declare module "@babel/helper-function-name" {
 }
 
 declare module "@babel/helper-split-export-declaration" {
-  declare export default function splitExportDeclaration(exportDeclaration: any): any;
+  declare export default function splitExportDeclaration(
+    exportDeclaration: any
+  ): any;
 }
 
 declare module "@babel/traverse" {
@@ -196,6 +198,13 @@ declare module "@babel/highlight" {
   /**
    * Highlight `code`.
    */
-  declare export default function highlight(code: string, options?: Options): string;
-    declare export { getChalk, shouldHighlight };
+  declare export default function highlight(
+    code: string,
+    options?: Options
+  ): string;
+  declare export { getChalk, shouldHighlight };
+}
+
+declare module "@babel/plugin-bugfix-v8-spread-parameters-in-optional-chaining" {
+  declare module.exports: any;
 }

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/.npmignore

@@ -0,0 +1,3 @@
+src
+test
+*.log

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/README.md

@@ -0,0 +1,19 @@
+# @babel/plugin-bugfix-v8-spread-parameters-in-optional-chaining
+
+> Transform optional chaining operators to workaround a [v8 bug](https://crbug.com/v8/11558).
+
+See our website [@babel/plugin-bugfix-v8-spread-parameters-in-optional-chaining](https://babeljs.io/docs/en/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining) for more information.
+
+## Install
+
+Using npm:
+
+```sh
+npm install --save-dev @babel/plugin-bugfix-v8-spread-parameters-in-optional-chaining
+```
+
+or using yarn:
+
+```sh
+yarn add @babel/plugin-bugfix-v8-spread-parameters-in-optional-chaining --dev
+```

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/package.json

@@ -0,0 +1,38 @@
+{
+  "name": "@babel/plugin-bugfix-v8-spread-parameters-in-optional-chaining",
+  "version": "7.13.8",
+  "description": "Transform optional chaining operators to workaround https://crbug.com/v8/11558",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/babel/babel.git",
+    "directory": "packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining"
+  },
+  "homepage": "https://babel.dev/docs/en/next/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining",
+  "license": "MIT",
+  "publishConfig": {
+    "access": "public"
+  },
+  "main": "lib/index.js",
+  "exports": {
+    ".": [
+      "./lib/index.js"
+    ]
+  },
+  "keywords": [
+    "babel-plugin",
+    "bugfix"
+  ],
+  "dependencies": {
+    "@babel/helper-plugin-utils": "workspace:^7.13.0",
+    "@babel/helper-skip-transparent-expression-wrappers": "workspace:^7.12.1",
+    "@babel/plugin-proposal-optional-chaining": "workspace:^7.13.8"
+  },
+  "peerDependencies": {
+    "@babel/core": "^7.13.0"
+  },
+  "devDependencies": {
+    "@babel/core": "workspace:*",
+    "@babel/helper-plugin-test-runner": "workspace:*",
+    "@babel/traverse": "workspace:*"
+  }
+}

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/src/index.ts

@@ -0,0 +1,22 @@
+import { declare } from "@babel/helper-plugin-utils";
+import { transform } from "@babel/plugin-proposal-optional-chaining";
+import { shouldTransform } from "./util";
+
+export default declare(api => {
+  api.assertVersion(7);
+
+  const noDocumentAll = api.assumption("noDocumentAll");
+  const pureGetters = api.assumption("pureGetters");
+
+  return {
+    name: "bugfix-v8-spread-parameters-in-optional-chaining",
+
+    visitor: {
+      "OptionalCallExpression|OptionalMemberExpression"(path) {
+        if (shouldTransform(path)) {
+          transform(path, { noDocumentAll, pureGetters });
+        }
+      },
+    },
+  };
+});

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/src/util.ts

@@ -0,0 +1,59 @@
+import { skipTransparentExprWrappers } from "@babel/helper-skip-transparent-expression-wrappers";
+import type { NodePath } from "@babel/traverse";
+import { types as t } from "@babel/core";
+// https://crbug.com/v8/11558
+
+// check if there is a spread element followed by another argument.
+// (...[], 0) or (...[], ...[])
+
+function matchAffectedArguments(argumentNodes) {
+  const spreadIndex = argumentNodes.findIndex(node => t.isSpreadElement(node));
+  return spreadIndex >= 0 && spreadIndex !== argumentNodes.length - 1;
+}
+
+/**
+ * Check whether the optional chain is affected by https://crbug.com/v8/11558.
+ * This routine MUST not manipulate NodePath
+ *
+ * @export
+ * @param {(NodePath<t.OptionalMemberExpression | t.OptionalCallExpression>)} path
+ * @returns {boolean}
+ */
+export function shouldTransform(
+  path: NodePath<t.OptionalMemberExpression | t.OptionalCallExpression>,
+): boolean {
+  let optionalPath = path;
+  const chains = [];
+  while (
+    optionalPath.isOptionalMemberExpression() ||
+    optionalPath.isOptionalCallExpression()
+  ) {
+    const { node } = optionalPath;
+    chains.push(node);
+
+    if (optionalPath.isOptionalMemberExpression()) {
+      optionalPath = skipTransparentExprWrappers(optionalPath.get("object"));
+    } else if (optionalPath.isOptionalCallExpression()) {
+      optionalPath = skipTransparentExprWrappers(optionalPath.get("callee"));
+    }
+  }
+  for (let i = 0; i < chains.length; i++) {
+    const node = chains[i];
+    if (
+      t.isOptionalCallExpression(node) &&
+      matchAffectedArguments(node.arguments)
+    ) {
+      // f?.(...[], 0)
+      if (node.optional) {
+        return true;
+      }
+      // o?.m(...[], 0)
+      // when node.optional is false, chains[i + 1] is always well defined
+      const callee = chains[i + 1];
+      if (t.isOptionalMemberExpression(callee, { optional: true })) {
+        return true;
+      }
+    }
+  }
+  return false;
+}

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/fixtures/assumption-noDocumentAll/basic/input.mjs

@@ -0,0 +1,7 @@
+fn?.(...b, 1);
+
+a?.b(...c, 1);
+
+a?.b?.(...c, 1);
+
+a.b?.(...c, 1);

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/fixtures/assumption-noDocumentAll/basic/output.mjs

@@ -0,0 +1,6 @@
+var _fn, _a, _a2, _a2$b, _a$b, _a3;
+
+(_fn = fn) === null || _fn === void 0 ? void 0 : _fn(...b, 1);
+(_a = a) === null || _a === void 0 ? void 0 : _a.b(...c, 1);
+(_a2 = a) === null || _a2 === void 0 ? void 0 : (_a2$b = _a2.b) === null || _a2$b === void 0 ? void 0 : _a2$b.call(_a2, ...c, 1);
+(_a$b = (_a3 = a).b) === null || _a$b === void 0 ? void 0 : _a$b.call(_a3, ...c, 1);

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/fixtures/assumption-pureGetters/function-call/input.js

@@ -0,0 +1,19 @@
+foo?.(...[], 1);
+
+foo?.bar(...[], 1)
+
+foo.bar?.(foo.bar, ...[], 1)
+
+foo?.bar?.(foo.bar, ...[], 1)
+
+foo?.(...[], 1).bar
+
+foo?.(...[], 1)?.bar
+
+foo.bar?.(...[], 1).baz
+
+foo.bar?.(...[], 1)?.baz
+
+foo?.bar?.(...[], 1).baz
+
+foo?.bar?.(...[], 1)?.baz

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/fixtures/basic/basic-integration-optional-chaining/input.mjs

@@ -0,0 +1,5 @@
+fn?.(...b, 1);
+
+a?.b(...c, 1);
+
+a?.b?.(...c, 1);

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/fixtures/basic/basic-integration-optional-chaining/options.json

@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    "proposal-optional-chaining", "bugfix-v8-spread-parameters-in-optional-chaining"
+  ]
+}

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/fixtures/basic/basic-integration-optional-chaining/output.mjs

@@ -0,0 +1,5 @@
+var _fn, _a, _a2, _a2$b;
+
+(_fn = fn) === null || _fn === void 0 ? void 0 : _fn(...b, 1);
+(_a = a) === null || _a === void 0 ? void 0 : _a.b(...c, 1);
+(_a2 = a) === null || _a2 === void 0 ? void 0 : (_a2$b = _a2.b) === null || _a2$b === void 0 ? void 0 : _a2$b.call(_a2, ...c, 1);

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/fixtures/basic/basic/input.mjs

@@ -0,0 +1,7 @@
+fn?.(...b, 1);
+
+a?.b(...c, 1);
+
+a?.b?.(...c, 1);
+
+a.b?.(...c, 1);

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/fixtures/basic/basic/output.mjs

@@ -0,0 +1,6 @@
+var _fn, _a, _a2, _a2$b, _a$b, _a3;
+
+(_fn = fn) === null || _fn === void 0 ? void 0 : _fn(...b, 1);
+(_a = a) === null || _a === void 0 ? void 0 : _a.b(...c, 1);
+(_a2 = a) === null || _a2 === void 0 ? void 0 : (_a2$b = _a2.b) === null || _a2$b === void 0 ? void 0 : _a2$b.call(_a2, ...c, 1);
+(_a$b = (_a3 = a).b) === null || _a$b === void 0 ? void 0 : _a$b.call(_a3, ...c, 1);

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/fixtures/basic/class-private-integration-optional-chaining/exec.mjs

@@ -0,0 +1,13 @@
+class C {
+  #m;
+  constructor() {
+    const o = null;
+    const n = this;
+    const p = o?.#m(...c, 1);
+    const q = n?.#m?.(...c, 1);
+    expect(p).toBe(undefined);
+    expect(q).toBe(undefined);
+  }
+}
+
+new C();

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/fixtures/basic/class-private-integration-optional-chaining/input.mjs

@@ -0,0 +1,9 @@
+class C {
+    #m;
+    constructor() {
+        const o = null;
+        const n = this;
+        const p = o?.#m(...c, 1);
+        const q = n?.#m?.(...c, 1);
+    }
+}

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/fixtures/basic/class-private-integration-optional-chaining/options.json

@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    "proposal-class-properties", "proposal-private-methods", "proposal-optional-chaining", "bugfix-v8-spread-parameters-in-optional-chaining"
+  ]
+}

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/fixtures/basic/class-private-integration-optional-chaining/output.mjs

@@ -0,0 +1,18 @@
+var _m = new WeakMap();
+
+class C {
+  constructor() {
+    var _babelHelpers$classPr;
+
+    _m.set(this, {
+      writable: true,
+      value: void 0
+    });
+
+    const o = null;
+    const n = this;
+    const p = o === null || o === void 0 ? void 0 : babelHelpers.classPrivateFieldGet(o, _m).call(o, ...c, 1);
+    const q = n === null || n === void 0 ? void 0 : (_babelHelpers$classPr = babelHelpers.classPrivateFieldGet(n, _m)) === null || _babelHelpers$classPr === void 0 ? void 0 : _babelHelpers$classPr.call(n, ...c, 1);
+  }
+
+}

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/fixtures/basic/class-private-integration/exec.mjs

@@ -0,0 +1,13 @@
+class C {
+  #m;
+  constructor() {
+    const o = null;
+    const n = this;
+    const p = o?.#m(...c, 1);
+    const q = n?.#m?.(...c, 1);
+    expect(p).toBe(undefined);
+    expect(q).toBe(undefined);
+  }
+}
+
+new C();

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/fixtures/basic/class-private-integration/input.mjs

@@ -0,0 +1,9 @@
+class C {
+    #m;
+    constructor() {
+        const o = null;
+        const n = this;
+        const p = o?.#m(...c, 1);
+        const q = n?.#m?.(...c, 1);
+    }
+}

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/fixtures/basic/class-private-integration/options.json

@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    "proposal-class-properties", "proposal-private-methods", "bugfix-v8-spread-parameters-in-optional-chaining"
+  ]
+}

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/fixtures/basic/class-private-integration/output.mjs

@@ -0,0 +1,18 @@
+var _m = new WeakMap();
+
+class C {
+  constructor() {
+    var _babelHelpers$classPr;
+
+    _m.set(this, {
+      writable: true,
+      value: void 0
+    });
+
+    const o = null;
+    const n = this;
+    const p = o === null || o === void 0 ? void 0 : babelHelpers.classPrivateFieldGet(o, _m).call(o, ...c, 1);
+    const q = n === null || n === void 0 ? void 0 : (_babelHelpers$classPr = babelHelpers.classPrivateFieldGet(n, _m)) === null || _babelHelpers$classPr === void 0 ? void 0 : _babelHelpers$classPr.call(n, ...c, 1);
+  }
+
+}

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/fixtures/basic/class-private/exec.mjs

@@ -0,0 +1,13 @@
+class C {
+    #m;
+    constructor() {
+        const o = null;
+        const n = this;
+        const p = o?.#m(...c, 1);
+        const q = n?.#m?.(...c, 1);
+        expect(p).toBe(undefined);
+        expect(q).toBe(undefined);
+    }
+}
+
+new C;

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/fixtures/basic/class-private/input.mjs

@@ -0,0 +1,9 @@
+class C {
+    #m;
+    constructor() {
+        const o = null;
+        const n = this;
+        const p = o?.#m(...c, 1);
+        const q = n?.#m?.(...c, 1);
+    }
+}

packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/fixtures/basic/class-private/options.json

@@ -0,0 +1,10 @@
+{
+  "minNodeVersion": "14.0.0",
+  "parserOpts": {
+    "plugins": [
+      "classPrivateMethods",
+      "classPrivateProperties",
+      "classProperties"
+    ]
+  }
+}