19.0.5

Co-authored-by: "Sebastian \"Sebbie\" Silbermann" <sebastian.silbermann@vercel.com>

.editorconfig

@@ -8,11 +8,9 @@ indent_size = 2
 indent_style = space
 insert_final_newline = true
 max_line_length = 80
-trim_trailing_whitespace = true
 
 [*.md]
 max_line_length = 0
-trim_trailing_whitespace = false
 
 [COMMIT_EDITMSG]
 max_line_length = 0

.github/workflows/devtools_regression_tests.yml

@@ -31,6 +31,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: runtime-release-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock', 'scripts/release/yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - run: yarn install --frozen-lockfile
         working-directory: scripts/release
@@ -63,6 +65,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: runtime-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - name: Restore archived build
         uses: actions/download-artifact@v4

.github/workflows/runtime_build_and_test.yml

@@ -3,6 +3,10 @@ name: (Runtime) Build and Test
 on:
   push:
     branches: [main]
+    tags:
+      # To get CI for backport releases.
+      # This will duplicate CI for releases from main which is acceptable
+      - "v*"
   pull_request:
     paths-ignore:
       - compiler/**
@@ -53,6 +57,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: runtime-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - run: node ./scripts/tasks/flow-ci ${{ matrix.flow_inline_config_shortname }}
 
@@ -73,6 +79,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: runtime-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - run: |
           yarn generate-inline-fizz-runtime
@@ -95,6 +103,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: runtime-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - run: yarn flags
 
@@ -144,6 +154,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: runtime-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - run: yarn test ${{ matrix.params }} --ci --shard=${{ matrix.shard }}
 
@@ -173,6 +185,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: runtime-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - run: yarn build --index=${{ matrix.worker_id }} --total=20 --r=${{ matrix.release_channel }} --ci
         env:
@@ -243,6 +257,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: runtime-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - name: Restore archived build
         uses: actions/download-artifact@v4
@@ -271,6 +287,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: runtime-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - name: Restore archived build
         uses: actions/download-artifact@v4
@@ -314,6 +332,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: runtime-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - name: Restore archived build
         uses: actions/download-artifact@v4
@@ -345,6 +365,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: runtime-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - name: Restore archived build
         uses: actions/download-artifact@v4
@@ -373,6 +395,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: fixtures_dom-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - run: yarn install --frozen-lockfile --cache-folder ~/.cache/yarn
         working-directory: fixtures/dom
@@ -413,6 +437,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: fixtures_flight-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - name: Restore archived build
         uses: actions/download-artifact@v4
@@ -469,6 +495,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: runtime-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - name: Restore archived build
         uses: actions/download-artifact@v4
@@ -515,6 +543,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: runtime-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - name: Restore archived build
         uses: actions/download-artifact@v4
@@ -547,6 +577,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: ${{ runner.arch }}-${{ runner.os }}-modules-${{ hashFiles('yarn.lock', 'scripts/release/yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - run: yarn install --frozen-lockfile
         working-directory: scripts/release
@@ -586,6 +618,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: runtime-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - name: Restore archived build for PR
         uses: actions/download-artifact@v4

.github/workflows/runtime_commit_artifacts.yml

@@ -75,6 +75,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: runtime-release-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock', 'scripts/release/yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
         name: yarn install (react)
       - run: yarn install --frozen-lockfile

.github/workflows/runtime_prereleases.yml

@@ -41,6 +41,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: runtime-release-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock', 'scripts/release/yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - run: yarn install --frozen-lockfile
         working-directory: scripts/release

.github/workflows/shared_lint.yml

@@ -30,6 +30,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: shared-lint-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('**/yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - run: yarn prettier-check
 
@@ -48,6 +50,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: shared-lint-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('**/yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - run: node ./scripts/tasks/eslint
 
@@ -66,6 +70,8 @@ jobs:
         with:
           path: "**/node_modules"
           key: shared-lint-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('**/yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - run: ./scripts/ci/check_license.sh
 
@@ -84,5 +90,7 @@ jobs:
         with:
           path: "**/node_modules"
           key: shared-lint-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('**/yarn.lock') }}
+      - name: Ensure clean build directory
+        run: rm -rf build
       - run: yarn install --frozen-lockfile
       - run: ./scripts/ci/test_print_warnings.sh

ReactVersions.js

@@ -7,18 +7,18 @@
 //
 // The @latest channel uses the version as-is, e.g.:
 //
-//   19.0.0
+//   19.0.5
 //
 // The @canary channel appends additional information, with the scheme
 // <version>-<label>-<commit_sha>, e.g.:
 //
-//   19.0.0-canary-a1c2d3e4
+//   19.0.5-canary-a1c2d3e4
 //
 // The @experimental channel doesn't include a version, only a date and a sha, e.g.:
 //
 //   0.0.0-experimental-241c4467e-20200129
 
-const ReactVersion = '19.0.0';
+const ReactVersion = '19.0.5';
 
 // The label used by the @canary channel. Represents the upcoming release's
 // stability. Most of the time, this will be "canary", but we may temporarily
@@ -30,7 +30,7 @@ const canaryChannelLabel = 'rc';
 
 // If the canaryChannelLabel is "rc", the build pipeline will use this to build
 // an RC version of the packages.
-const rcNumber = 0;
+const rcNumber = 1;
 
 const stablePackages = {
   'eslint-plugin-react-hooks': '5.1.0',

compiler/apps/playground/components/Editor/EditorImpl.tsx

@@ -14,7 +14,7 @@ import {
   CompilerErrorDetail,
   Effect,
   ErrorSeverity,
-  parseConfigPragma,
+  parseConfigPragmaForTests,
   ValueKind,
   runPlayground,
   type Hook,
@@ -208,7 +208,7 @@ function compile(source: string): [CompilerOutput, 'flow' | 'typescript'] {
   try {
     // Extract the first line to quickly check for custom test directives
     const pragma = source.substring(0, source.indexOf('\n'));
-    const config = parseConfigPragma(pragma);
+    const config = parseConfigPragmaForTests(pragma);
 
     for (const fn of parseFunctions(source, language)) {
       const id = withIdentifier(getFunctionIdentifier(fn));

compiler/fixtures/runtime-compat/README.md

@@ -1 +0,0 @@
-Reference library compiled with React Compiler.

compiler/fixtures/runtime-compat/app-18/.gitignore

@@ -1,24 +0,0 @@
-# Logs
-logs
-*.log
-npm-debug.log*
-yarn-debug.log*
-yarn-error.log*
-pnpm-debug.log*
-lerna-debug.log*
-
-node_modules
-dist
-dist-ssr
-*.local
-
-# Editor directories and files
-.vscode/*
-!.vscode/extensions.json
-.idea
-.DS_Store
-*.suo
-*.ntvs*
-*.njsproj
-*.sln
-*.sw?

compiler/fixtures/runtime-compat/app-18/README.md

@@ -1,50 +0,0 @@
-# React + TypeScript + Vite
-
-This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.
-
-Currently, two official plugins are available:
-
-- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react/README.md) uses [Babel](https://babeljs.io/) for Fast Refresh
-- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react-swc) uses [SWC](https://swc.rs/) for Fast Refresh
-
-## Expanding the ESLint configuration
-
-If you are developing a production application, we recommend updating the configuration to enable type aware lint rules:
-
-- Configure the top-level `parserOptions` property like this:
-
-```js
-export default tseslint.config({
-  languageOptions: {
-    // other options...
-    parserOptions: {
-      project: ['./tsconfig.node.json', './tsconfig.app.json'],
-      tsconfigRootDir: import.meta.dirname,
-    },
-  },
-})
-```
-
-- Replace `tseslint.configs.recommended` to `tseslint.configs.recommendedTypeChecked` or `tseslint.configs.strictTypeChecked`
-- Optionally add `...tseslint.configs.stylisticTypeChecked`
-- Install [eslint-plugin-react](https://github.com/jsx-eslint/eslint-plugin-react) and update the config:
-
-```js
-// eslint.config.js
-import react from 'eslint-plugin-react'
-
-export default tseslint.config({
-  // Set the react version
-  settings: { react: { version: '18.3' } },
-  plugins: {
-    // Add the react plugin
-    react,
-  },
-  rules: {
-    // other rules...
-    // Enable its recommended rules
-    ...react.configs.recommended.rules,
-    ...react.configs['jsx-runtime'].rules,
-  },
-})
-```

compiler/fixtures/runtime-compat/app-18/eslint.config.js

@@ -1,28 +0,0 @@
-import js from '@eslint/js';
-import globals from 'globals';
-import reactHooks from 'eslint-plugin-react-hooks';
-import reactRefresh from 'eslint-plugin-react-refresh';
-import tseslint from 'typescript-eslint';
-
-export default tseslint.config(
-  {ignores: ['dist']},
-  {
-    extends: [js.configs.recommended, ...tseslint.configs.recommended],
-    files: ['**/*.{ts,tsx}'],
-    languageOptions: {
-      ecmaVersion: 2020,
-      globals: globals.browser,
-    },
-    plugins: {
-      'react-hooks': reactHooks,
-      'react-refresh': reactRefresh,
-    },
-    rules: {
-      ...reactHooks.configs.recommended.rules,
-      'react-refresh/only-export-components': [
-        'warn',
-        {allowConstantExport: true},
-      ],
-    },
-  }
-);

compiler/fixtures/runtime-compat/app-18/index.html

@@ -1,13 +0,0 @@
-<!doctype html>
-<html lang="en">
-  <head>
-    <meta charset="UTF-8" />
-    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
-    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Vite + React + TS</title>
-  </head>
-  <body>
-    <div id="root"></div>
-    <script type="module" src="/src/main.tsx"></script>
-  </body>
-</html>

compiler/fixtures/runtime-compat/app-18/package.json

@@ -1,32 +0,0 @@
-{
-  "name": "app-18",
-  "private": true,
-  "version": "0.0.0",
-  "type": "module",
-  "scripts": {
-    "dev": "vite",
-    "build": "tsc -b && vite build",
-    "lint": "eslint .",
-    "preview": "vite preview"
-  },
-  "dependencies": {
-    "react": "^18.3.1",
-    "react-compiler-runtime": "19.0.0-beta-9ee70a1-20241017",
-    "react-dom": "^18.3.1",
-    "runtime-compat-lib": "file:../lib"
-  },
-  "devDependencies": {
-    "@eslint/js": "^9.11.1",
-    "@types/react": "^18.3.10",
-    "@types/react-dom": "^18.3.0",
-    "@vitejs/plugin-react": "^4.3.2",
-    "babel-plugin-react-compiler": "19.0.0-beta-9ee70a1-20241017",
-    "eslint": "^9.11.1",
-    "eslint-plugin-react-hooks": "^5.1.0-rc.0",
-    "eslint-plugin-react-refresh": "^0.4.12",
-    "globals": "^15.9.0",
-    "typescript": "^5.5.3",
-    "typescript-eslint": "^8.7.0",
-    "vite": "^5.4.8"
-  }
-}

compiler/fixtures/runtime-compat/app-18/public/vite.svg

@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="31.88" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 257"><defs><linearGradient id="IconifyId1813088fe1fbc01fb466" x1="-.828%" x2="57.636%" y1="7.652%" y2="78.411%"><stop offset="0%" stop-color="#41D1FF"></stop><stop offset="100%" stop-color="#BD34FE"></stop></linearGradient><linearGradient id="IconifyId1813088fe1fbc01fb467" x1="43.376%" x2="50.316%" y1="2.242%" y2="89.03%"><stop offset="0%" stop-color="#FFEA83"></stop><stop offset="8.333%" stop-color="#FFDD35"></stop><stop offset="100%" stop-color="#FFA800"></stop></linearGradient></defs><path fill="url(#IconifyId1813088fe1fbc01fb466)" d="M255.153 37.938L134.897 252.976c-2.483 4.44-8.862 4.466-11.382.048L.875 37.958c-2.746-4.814 1.371-10.646 6.827-9.67l120.385 21.517a6.537 6.537 0 0 0 2.322-.004l117.867-21.483c5.438-.991 9.574 4.796 6.877 9.62Z"></path><path fill="url(#IconifyId1813088fe1fbc01fb467)" d="M185.432.063L96.44 17.501a3.268 3.268 0 0 0-2.634 3.014l-5.474 92.456a3.268 3.268 0 0 0 3.997 3.378l24.777-5.718c2.318-.535 4.413 1.507 3.936 3.838l-7.361 36.047c-.495 2.426 1.782 4.5 4.151 3.78l15.304-4.649c2.372-.72 4.652 1.36 4.15 3.788l-11.698 56.621c-.732 3.542 3.979 5.473 5.943 2.437l1.313-2.028l72.516-144.72c1.215-2.423-.88-5.186-3.54-4.672l-25.505 4.922c-2.396.462-4.435-1.77-3.759-4.114l16.646-57.705c.677-2.35-1.37-4.583-3.769-4.113Z"></path></svg>

compiler/fixtures/runtime-compat/app-18/src/App.css

@@ -1,42 +0,0 @@
-#root {
-  max-width: 1280px;
-  margin: 0 auto;
-  padding: 2rem;
-  text-align: center;
-}
-
-.logo {
-  height: 6em;
-  padding: 1.5em;
-  will-change: filter;
-  transition: filter 300ms;
-}
-.logo:hover {
-  filter: drop-shadow(0 0 2em #646cffaa);
-}
-.logo.react:hover {
-  filter: drop-shadow(0 0 2em #61dafbaa);
-}
-
-@keyframes logo-spin {
-  from {
-    transform: rotate(0deg);
-  }
-  to {
-    transform: rotate(360deg);
-  }
-}
-
-@media (prefers-reduced-motion: no-preference) {
-  a:nth-of-type(2) .logo {
-    animation: logo-spin infinite 20s linear;
-  }
-}
-
-.card {
-  padding: 2em;
-}
-
-.read-the-docs {
-  color: #888;
-}

compiler/fixtures/runtime-compat/app-18/src/App.tsx

@@ -1,16 +0,0 @@
-import 'react';
-import './App.css';
-// @ts-expect-error no types
-import {useTime} from 'runtime-compat-lib';
-
-function App() {
-  const time = useTime();
-  return (
-    <>
-      <h1>React 18</h1>
-      <span>Current time: {time.toLocaleString()}</span>
-    </>
-  );
-}
-
-export default App;

compiler/fixtures/runtime-compat/app-18/src/assets/react.svg

@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="35.93" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 228"><path fill="#00D8FF" d="M210.483 73.824a171.49 171.49 0 0 0-8.24-2.597c.465-1.9.893-3.777 1.273-5.621c6.238-30.281 2.16-54.676-11.769-62.708c-13.355-7.7-35.196.329-57.254 19.526a171.23 171.23 0 0 0-6.375 5.848a155.866 155.866 0 0 0-4.241-3.917C100.759 3.829 77.587-4.822 63.673 3.233C50.33 10.957 46.379 33.89 51.995 62.588a170.974 170.974 0 0 0 1.892 8.48c-3.28.932-6.445 1.924-9.474 2.98C17.309 83.498 0 98.307 0 113.668c0 15.865 18.582 31.778 46.812 41.427a145.52 145.52 0 0 0 6.921 2.165a167.467 167.467 0 0 0-2.01 9.138c-5.354 28.2-1.173 50.591 12.134 58.266c13.744 7.926 36.812-.22 59.273-19.855a145.567 145.567 0 0 0 5.342-4.923a168.064 168.064 0 0 0 6.92 6.314c21.758 18.722 43.246 26.282 56.54 18.586c13.731-7.949 18.194-32.003 12.4-61.268a145.016 145.016 0 0 0-1.535-6.842c1.62-.48 3.21-.974 4.76-1.488c29.348-9.723 48.443-25.443 48.443-41.52c0-15.417-17.868-30.326-45.517-39.844Zm-6.365 70.984c-1.4.463-2.836.91-4.3 1.345c-3.24-10.257-7.612-21.163-12.963-32.432c5.106-11 9.31-21.767 12.459-31.957c2.619.758 5.16 1.557 7.61 2.4c23.69 8.156 38.14 20.213 38.14 29.504c0 9.896-15.606 22.743-40.946 31.14Zm-10.514 20.834c2.562 12.94 2.927 24.64 1.23 33.787c-1.524 8.219-4.59 13.698-8.382 15.893c-8.067 4.67-25.32-1.4-43.927-17.412a156.726 156.726 0 0 1-6.437-5.87c7.214-7.889 14.423-17.06 21.459-27.246c12.376-1.098 24.068-2.894 34.671-5.345a134.17 134.17 0 0 1 1.386 6.193ZM87.276 214.515c-7.882 2.783-14.16 2.863-17.955.675c-8.075-4.657-11.432-22.636-6.853-46.752a156.923 156.923 0 0 1 1.869-8.499c10.486 2.32 22.093 3.988 34.498 4.994c7.084 9.967 14.501 19.128 21.976 27.15a134.668 134.668 0 0 1-4.877 4.492c-9.933 8.682-19.886 14.842-28.658 17.94ZM50.35 144.747c-12.483-4.267-22.792-9.812-29.858-15.863c-6.35-5.437-9.555-10.836-9.555-15.216c0-9.322 13.897-21.212 37.076-29.293c2.813-.98 5.757-1.905 8.812-2.773c3.204 10.42 7.406 21.315 12.477 32.332c-5.137 11.18-9.399 22.249-12.634 32.792a134.718 134.718 0 0 1-6.318-1.979Zm12.378-84.26c-4.811-24.587-1.616-43.134 6.425-47.789c8.564-4.958 27.502 2.111 47.463 19.835a144.318 144.318 0 0 1 3.841 3.545c-7.438 7.987-14.787 17.08-21.808 26.988c-12.04 1.116-23.565 2.908-34.161 5.309a160.342 160.342 0 0 1-1.76-7.887Zm110.427 27.268a347.8 347.8 0 0 0-7.785-12.803c8.168 1.033 15.994 2.404 23.343 4.08c-2.206 7.072-4.956 14.465-8.193 22.045a381.151 381.151 0 0 0-7.365-13.322Zm-45.032-43.861c5.044 5.465 10.096 11.566 15.065 18.186a322.04 322.04 0 0 0-30.257-.006c4.974-6.559 10.069-12.652 15.192-18.18ZM82.802 87.83a323.167 323.167 0 0 0-7.227 13.238c-3.184-7.553-5.909-14.98-8.134-22.152c7.304-1.634 15.093-2.97 23.209-3.984a321.524 321.524 0 0 0-7.848 12.897Zm8.081 65.352c-8.385-.936-16.291-2.203-23.593-3.793c2.26-7.3 5.045-14.885 8.298-22.6a321.187 321.187 0 0 0 7.257 13.246c2.594 4.48 5.28 8.868 8.038 13.147Zm37.542 31.03c-5.184-5.592-10.354-11.779-15.403-18.433c4.902.192 9.899.29 14.978.29c5.218 0 10.376-.117 15.453-.343c-4.985 6.774-10.018 12.97-15.028 18.486Zm52.198-57.817c3.422 7.8 6.306 15.345 8.596 22.52c-7.422 1.694-15.436 3.058-23.88 4.071a382.417 382.417 0 0 0 7.859-13.026a347.403 347.403 0 0 0 7.425-13.565Zm-16.898 8.101a358.557 358.557 0 0 1-12.281 19.815a329.4 329.4 0 0 1-23.444.823c-7.967 0-15.716-.248-23.178-.732a310.202 310.202 0 0 1-12.513-19.846h.001a307.41 307.41 0 0 1-10.923-20.627a310.278 310.278 0 0 1 10.89-20.637l-.001.001a307.318 307.318 0 0 1 12.413-19.761c7.613-.576 15.42-.876 23.31-.876H128c7.926 0 15.743.303 23.354.883a329.357 329.357 0 0 1 12.335 19.695a358.489 358.489 0 0 1 11.036 20.54a329.472 329.472 0 0 1-11 20.722Zm22.56-122.124c8.572 4.944 11.906 24.881 6.52 51.026c-.344 1.668-.73 3.367-1.15 5.09c-10.622-2.452-22.155-4.275-34.23-5.408c-7.034-10.017-14.323-19.124-21.64-27.008a160.789 160.789 0 0 1 5.888-5.4c18.9-16.447 36.564-22.941 44.612-18.3ZM128 90.808c12.625 0 22.86 10.235 22.86 22.86s-10.235 22.86-22.86 22.86s-22.86-10.235-22.86-22.86s10.235-22.86 22.86-22.86Z"></path></svg>

compiler/fixtures/runtime-compat/app-18/src/index.css

@@ -1,68 +0,0 @@
-:root {
-  font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;
-  line-height: 1.5;
-  font-weight: 400;
-
-  color-scheme: light dark;
-  color: rgba(255, 255, 255, 0.87);
-  background-color: #242424;
-
-  font-synthesis: none;
-  text-rendering: optimizeLegibility;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-}
-
-a {
-  font-weight: 500;
-  color: #646cff;
-  text-decoration: inherit;
-}
-a:hover {
-  color: #535bf2;
-}
-
-body {
-  margin: 0;
-  display: flex;
-  place-items: center;
-  min-width: 320px;
-  min-height: 100vh;
-}
-
-h1 {
-  font-size: 3.2em;
-  line-height: 1.1;
-}
-
-button {
-  border-radius: 8px;
-  border: 1px solid transparent;
-  padding: 0.6em 1.2em;
-  font-size: 1em;
-  font-weight: 500;
-  font-family: inherit;
-  background-color: #1a1a1a;
-  cursor: pointer;
-  transition: border-color 0.25s;
-}
-button:hover {
-  border-color: #646cff;
-}
-button:focus,
-button:focus-visible {
-  outline: 4px auto -webkit-focus-ring-color;
-}
-
-@media (prefers-color-scheme: light) {
-  :root {
-    color: #213547;
-    background-color: #ffffff;
-  }
-  a:hover {
-    color: #747bff;
-  }
-  button {
-    background-color: #f9f9f9;
-  }
-}

compiler/fixtures/runtime-compat/app-18/src/main.tsx

@@ -1,10 +0,0 @@
-import {StrictMode} from 'react';
-import {createRoot} from 'react-dom/client';
-import App from './App.tsx';
-import './index.css';
-
-createRoot(document.getElementById('root')!).render(
-  <StrictMode>
-    <App />
-  </StrictMode>,
-);

compiler/fixtures/runtime-compat/app-18/src/vite-env.d.ts

@@ -1 +0,0 @@
-/// <reference types="vite/client" />

compiler/fixtures/runtime-compat/app-18/tsconfig.app.json

@@ -1,24 +0,0 @@
-{
-  "compilerOptions": {
-    "target": "ES2020",
-    "useDefineForClassFields": true,
-    "lib": ["ES2020", "DOM", "DOM.Iterable"],
-    "module": "ESNext",
-    "skipLibCheck": true,
-
-    /* Bundler mode */
-    "moduleResolution": "bundler",
-    "allowImportingTsExtensions": true,
-    "isolatedModules": true,
-    "moduleDetection": "force",
-    "noEmit": true,
-    "jsx": "react-jsx",
-
-    /* Linting */
-    "strict": true,
-    "noUnusedLocals": true,
-    "noUnusedParameters": true,
-    "noFallthroughCasesInSwitch": true
-  },
-  "include": ["src"]
-}

compiler/fixtures/runtime-compat/app-18/tsconfig.app.tsbuildinfo

@@ -1 +0,0 @@
-{"root":["./src/app.tsx","./src/main.tsx","./src/vite-env.d.ts"],"version":"5.6.3"}

compiler/fixtures/runtime-compat/app-18/tsconfig.json

@@ -1,7 +0,0 @@
-{
-  "files": [],
-  "references": [
-    { "path": "./tsconfig.app.json" },
-    { "path": "./tsconfig.node.json" }
-  ]
-}

compiler/fixtures/runtime-compat/app-18/tsconfig.node.json

@@ -1,22 +0,0 @@
-{
-  "compilerOptions": {
-    "target": "ES2022",
-    "lib": ["ES2023"],
-    "module": "ESNext",
-    "skipLibCheck": true,
-
-    /* Bundler mode */
-    "moduleResolution": "bundler",
-    "allowImportingTsExtensions": true,
-    "isolatedModules": true,
-    "moduleDetection": "force",
-    "noEmit": true,
-
-    /* Linting */
-    "strict": true,
-    "noUnusedLocals": true,
-    "noUnusedParameters": true,
-    "noFallthroughCasesInSwitch": true
-  },
-  "include": ["vite.config.ts"]
-}

compiler/fixtures/runtime-compat/app-18/tsconfig.node.tsbuildinfo

@@ -1 +0,0 @@
-{"root":["./vite.config.ts"],"version":"5.6.3"}

compiler/fixtures/runtime-compat/app-18/vite.config.ts

@@ -1,11 +0,0 @@
-import {defineConfig} from 'vite';
-import react from '@vitejs/plugin-react';
-
-// https://vitejs.dev/config/
-export default defineConfig({
-  plugins: [
-    react({
-      babel: {plugins: [['babel-plugin-react-compiler', {target: '18'}]]},
-    }),
-  ],
-});

compiler/fixtures/runtime-compat/app-19/.gitignore

@@ -1,24 +0,0 @@
-# Logs
-logs
-*.log
-npm-debug.log*
-yarn-debug.log*
-yarn-error.log*
-pnpm-debug.log*
-lerna-debug.log*
-
-node_modules
-dist
-dist-ssr
-*.local
-
-# Editor directories and files
-.vscode/*
-!.vscode/extensions.json
-.idea
-.DS_Store
-*.suo
-*.ntvs*
-*.njsproj
-*.sln
-*.sw?

compiler/fixtures/runtime-compat/app-19/README.md

@@ -1,50 +0,0 @@
-# React + TypeScript + Vite
-
-This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.
-
-Currently, two official plugins are available:
-
-- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react/README.md) uses [Babel](https://babeljs.io/) for Fast Refresh
-- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react-swc) uses [SWC](https://swc.rs/) for Fast Refresh
-
-## Expanding the ESLint configuration
-
-If you are developing a production application, we recommend updating the configuration to enable type aware lint rules:
-
-- Configure the top-level `parserOptions` property like this:
-
-```js
-export default tseslint.config({
-  languageOptions: {
-    // other options...
-    parserOptions: {
-      project: ['./tsconfig.node.json', './tsconfig.app.json'],
-      tsconfigRootDir: import.meta.dirname,
-    },
-  },
-})
-```
-
-- Replace `tseslint.configs.recommended` to `tseslint.configs.recommendedTypeChecked` or `tseslint.configs.strictTypeChecked`
-- Optionally add `...tseslint.configs.stylisticTypeChecked`
-- Install [eslint-plugin-react](https://github.com/jsx-eslint/eslint-plugin-react) and update the config:
-
-```js
-// eslint.config.js
-import react from 'eslint-plugin-react'
-
-export default tseslint.config({
-  // Set the react version
-  settings: { react: { version: '18.3' } },
-  plugins: {
-    // Add the react plugin
-    react,
-  },
-  rules: {
-    // other rules...
-    // Enable its recommended rules
-    ...react.configs.recommended.rules,
-    ...react.configs['jsx-runtime'].rules,
-  },
-})
-```

compiler/fixtures/runtime-compat/app-19/eslint.config.js

@@ -1,28 +0,0 @@
-import js from '@eslint/js';
-import globals from 'globals';
-import reactHooks from 'eslint-plugin-react-hooks';
-import reactRefresh from 'eslint-plugin-react-refresh';
-import tseslint from 'typescript-eslint';
-
-export default tseslint.config(
-  {ignores: ['dist']},
-  {
-    extends: [js.configs.recommended, ...tseslint.configs.recommended],
-    files: ['**/*.{ts,tsx}'],
-    languageOptions: {
-      ecmaVersion: 2020,
-      globals: globals.browser,
-    },
-    plugins: {
-      'react-hooks': reactHooks,
-      'react-refresh': reactRefresh,
-    },
-    rules: {
-      ...reactHooks.configs.recommended.rules,
-      'react-refresh/only-export-components': [
-        'warn',
-        {allowConstantExport: true},
-      ],
-    },
-  }
-);

compiler/fixtures/runtime-compat/app-19/index.html

@@ -1,13 +0,0 @@
-<!doctype html>
-<html lang="en">
-  <head>
-    <meta charset="UTF-8" />
-    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
-    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Vite + React + TS</title>
-  </head>
-  <body>
-    <div id="root"></div>
-    <script type="module" src="/src/main.tsx"></script>
-  </body>
-</html>

compiler/fixtures/runtime-compat/app-19/package.json

@@ -1,31 +0,0 @@
-{
-  "name": "app-19",
-  "private": true,
-  "version": "0.0.0",
-  "type": "module",
-  "scripts": {
-    "dev": "vite",
-    "build": "tsc -b && vite build",
-    "lint": "eslint .",
-    "preview": "vite preview"
-  },
-  "dependencies": {
-    "react": "19.0.0-beta-26f2496093-20240514",
-    "react-dom": "19.0.0-beta-26f2496093-20240514",
-    "runtime-compat-lib": "file:../lib"
-  },
-  "devDependencies": {
-    "@eslint/js": "^9.11.1",
-    "@types/react": "^18.3.10",
-    "@types/react-dom": "^18.3.0",
-    "@vitejs/plugin-react": "^4.3.2",
-    "babel-plugin-react-compiler": "19.0.0-beta-9ee70a1-20241017",
-    "eslint": "^9.11.1",
-    "eslint-plugin-react-hooks": "^5.1.0-rc.0",
-    "eslint-plugin-react-refresh": "^0.4.12",
-    "globals": "^15.9.0",
-    "typescript": "^5.5.3",
-    "typescript-eslint": "^8.7.0",
-    "vite": "^5.4.8"
-  }
-}

compiler/fixtures/runtime-compat/app-19/public/vite.svg

@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="31.88" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 257"><defs><linearGradient id="IconifyId1813088fe1fbc01fb466" x1="-.828%" x2="57.636%" y1="7.652%" y2="78.411%"><stop offset="0%" stop-color="#41D1FF"></stop><stop offset="100%" stop-color="#BD34FE"></stop></linearGradient><linearGradient id="IconifyId1813088fe1fbc01fb467" x1="43.376%" x2="50.316%" y1="2.242%" y2="89.03%"><stop offset="0%" stop-color="#FFEA83"></stop><stop offset="8.333%" stop-color="#FFDD35"></stop><stop offset="100%" stop-color="#FFA800"></stop></linearGradient></defs><path fill="url(#IconifyId1813088fe1fbc01fb466)" d="M255.153 37.938L134.897 252.976c-2.483 4.44-8.862 4.466-11.382.048L.875 37.958c-2.746-4.814 1.371-10.646 6.827-9.67l120.385 21.517a6.537 6.537 0 0 0 2.322-.004l117.867-21.483c5.438-.991 9.574 4.796 6.877 9.62Z"></path><path fill="url(#IconifyId1813088fe1fbc01fb467)" d="M185.432.063L96.44 17.501a3.268 3.268 0 0 0-2.634 3.014l-5.474 92.456a3.268 3.268 0 0 0 3.997 3.378l24.777-5.718c2.318-.535 4.413 1.507 3.936 3.838l-7.361 36.047c-.495 2.426 1.782 4.5 4.151 3.78l15.304-4.649c2.372-.72 4.652 1.36 4.15 3.788l-11.698 56.621c-.732 3.542 3.979 5.473 5.943 2.437l1.313-2.028l72.516-144.72c1.215-2.423-.88-5.186-3.54-4.672l-25.505 4.922c-2.396.462-4.435-1.77-3.759-4.114l16.646-57.705c.677-2.35-1.37-4.583-3.769-4.113Z"></path></svg>

compiler/fixtures/runtime-compat/app-19/src/App.css

@@ -1,42 +0,0 @@
-#root {
-  max-width: 1280px;
-  margin: 0 auto;
-  padding: 2rem;
-  text-align: center;
-}
-
-.logo {
-  height: 6em;
-  padding: 1.5em;
-  will-change: filter;
-  transition: filter 300ms;
-}
-.logo:hover {
-  filter: drop-shadow(0 0 2em #646cffaa);
-}
-.logo.react:hover {
-  filter: drop-shadow(0 0 2em #61dafbaa);
-}
-
-@keyframes logo-spin {
-  from {
-    transform: rotate(0deg);
-  }
-  to {
-    transform: rotate(360deg);
-  }
-}
-
-@media (prefers-reduced-motion: no-preference) {
-  a:nth-of-type(2) .logo {
-    animation: logo-spin infinite 20s linear;
-  }
-}
-
-.card {
-  padding: 2em;
-}
-
-.read-the-docs {
-  color: #888;
-}

compiler/fixtures/runtime-compat/app-19/src/App.tsx

@@ -1,16 +0,0 @@
-import 'react';
-import './App.css';
-// @ts-expect-error no types
-import {useTime} from 'runtime-compat-lib';
-
-function App() {
-  const time = useTime();
-  return (
-    <>
-      <h1>React 19</h1>
-      <span>Current time: {time.toLocaleString()}</span>
-    </>
-  );
-}
-
-export default App;

compiler/fixtures/runtime-compat/app-19/src/assets/react.svg

@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="35.93" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 228"><path fill="#00D8FF" d="M210.483 73.824a171.49 171.49 0 0 0-8.24-2.597c.465-1.9.893-3.777 1.273-5.621c6.238-30.281 2.16-54.676-11.769-62.708c-13.355-7.7-35.196.329-57.254 19.526a171.23 171.23 0 0 0-6.375 5.848a155.866 155.866 0 0 0-4.241-3.917C100.759 3.829 77.587-4.822 63.673 3.233C50.33 10.957 46.379 33.89 51.995 62.588a170.974 170.974 0 0 0 1.892 8.48c-3.28.932-6.445 1.924-9.474 2.98C17.309 83.498 0 98.307 0 113.668c0 15.865 18.582 31.778 46.812 41.427a145.52 145.52 0 0 0 6.921 2.165a167.467 167.467 0 0 0-2.01 9.138c-5.354 28.2-1.173 50.591 12.134 58.266c13.744 7.926 36.812-.22 59.273-19.855a145.567 145.567 0 0 0 5.342-4.923a168.064 168.064 0 0 0 6.92 6.314c21.758 18.722 43.246 26.282 56.54 18.586c13.731-7.949 18.194-32.003 12.4-61.268a145.016 145.016 0 0 0-1.535-6.842c1.62-.48 3.21-.974 4.76-1.488c29.348-9.723 48.443-25.443 48.443-41.52c0-15.417-17.868-30.326-45.517-39.844Zm-6.365 70.984c-1.4.463-2.836.91-4.3 1.345c-3.24-10.257-7.612-21.163-12.963-32.432c5.106-11 9.31-21.767 12.459-31.957c2.619.758 5.16 1.557 7.61 2.4c23.69 8.156 38.14 20.213 38.14 29.504c0 9.896-15.606 22.743-40.946 31.14Zm-10.514 20.834c2.562 12.94 2.927 24.64 1.23 33.787c-1.524 8.219-4.59 13.698-8.382 15.893c-8.067 4.67-25.32-1.4-43.927-17.412a156.726 156.726 0 0 1-6.437-5.87c7.214-7.889 14.423-17.06 21.459-27.246c12.376-1.098 24.068-2.894 34.671-5.345a134.17 134.17 0 0 1 1.386 6.193ZM87.276 214.515c-7.882 2.783-14.16 2.863-17.955.675c-8.075-4.657-11.432-22.636-6.853-46.752a156.923 156.923 0 0 1 1.869-8.499c10.486 2.32 22.093 3.988 34.498 4.994c7.084 9.967 14.501 19.128 21.976 27.15a134.668 134.668 0 0 1-4.877 4.492c-9.933 8.682-19.886 14.842-28.658 17.94ZM50.35 144.747c-12.483-4.267-22.792-9.812-29.858-15.863c-6.35-5.437-9.555-10.836-9.555-15.216c0-9.322 13.897-21.212 37.076-29.293c2.813-.98 5.757-1.905 8.812-2.773c3.204 10.42 7.406 21.315 12.477 32.332c-5.137 11.18-9.399 22.249-12.634 32.792a134.718 134.718 0 0 1-6.318-1.979Zm12.378-84.26c-4.811-24.587-1.616-43.134 6.425-47.789c8.564-4.958 27.502 2.111 47.463 19.835a144.318 144.318 0 0 1 3.841 3.545c-7.438 7.987-14.787 17.08-21.808 26.988c-12.04 1.116-23.565 2.908-34.161 5.309a160.342 160.342 0 0 1-1.76-7.887Zm110.427 27.268a347.8 347.8 0 0 0-7.785-12.803c8.168 1.033 15.994 2.404 23.343 4.08c-2.206 7.072-4.956 14.465-8.193 22.045a381.151 381.151 0 0 0-7.365-13.322Zm-45.032-43.861c5.044 5.465 10.096 11.566 15.065 18.186a322.04 322.04 0 0 0-30.257-.006c4.974-6.559 10.069-12.652 15.192-18.18ZM82.802 87.83a323.167 323.167 0 0 0-7.227 13.238c-3.184-7.553-5.909-14.98-8.134-22.152c7.304-1.634 15.093-2.97 23.209-3.984a321.524 321.524 0 0 0-7.848 12.897Zm8.081 65.352c-8.385-.936-16.291-2.203-23.593-3.793c2.26-7.3 5.045-14.885 8.298-22.6a321.187 321.187 0 0 0 7.257 13.246c2.594 4.48 5.28 8.868 8.038 13.147Zm37.542 31.03c-5.184-5.592-10.354-11.779-15.403-18.433c4.902.192 9.899.29 14.978.29c5.218 0 10.376-.117 15.453-.343c-4.985 6.774-10.018 12.97-15.028 18.486Zm52.198-57.817c3.422 7.8 6.306 15.345 8.596 22.52c-7.422 1.694-15.436 3.058-23.88 4.071a382.417 382.417 0 0 0 7.859-13.026a347.403 347.403 0 0 0 7.425-13.565Zm-16.898 8.101a358.557 358.557 0 0 1-12.281 19.815a329.4 329.4 0 0 1-23.444.823c-7.967 0-15.716-.248-23.178-.732a310.202 310.202 0 0 1-12.513-19.846h.001a307.41 307.41 0 0 1-10.923-20.627a310.278 310.278 0 0 1 10.89-20.637l-.001.001a307.318 307.318 0 0 1 12.413-19.761c7.613-.576 15.42-.876 23.31-.876H128c7.926 0 15.743.303 23.354.883a329.357 329.357 0 0 1 12.335 19.695a358.489 358.489 0 0 1 11.036 20.54a329.472 329.472 0 0 1-11 20.722Zm22.56-122.124c8.572 4.944 11.906 24.881 6.52 51.026c-.344 1.668-.73 3.367-1.15 5.09c-10.622-2.452-22.155-4.275-34.23-5.408c-7.034-10.017-14.323-19.124-21.64-27.008a160.789 160.789 0 0 1 5.888-5.4c18.9-16.447 36.564-22.941 44.612-18.3ZM128 90.808c12.625 0 22.86 10.235 22.86 22.86s-10.235 22.86-22.86 22.86s-22.86-10.235-22.86-22.86s10.235-22.86 22.86-22.86Z"></path></svg>

compiler/fixtures/runtime-compat/app-19/src/index.css

@@ -1,68 +0,0 @@
-:root {
-  font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;
-  line-height: 1.5;
-  font-weight: 400;
-
-  color-scheme: light dark;
-  color: rgba(255, 255, 255, 0.87);
-  background-color: #242424;
-
-  font-synthesis: none;
-  text-rendering: optimizeLegibility;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-}
-
-a {
-  font-weight: 500;
-  color: #646cff;
-  text-decoration: inherit;
-}
-a:hover {
-  color: #535bf2;
-}
-
-body {
-  margin: 0;
-  display: flex;
-  place-items: center;
-  min-width: 320px;
-  min-height: 100vh;
-}
-
-h1 {
-  font-size: 3.2em;
-  line-height: 1.1;
-}
-
-button {
-  border-radius: 8px;
-  border: 1px solid transparent;
-  padding: 0.6em 1.2em;
-  font-size: 1em;
-  font-weight: 500;
-  font-family: inherit;
-  background-color: #1a1a1a;
-  cursor: pointer;
-  transition: border-color 0.25s;
-}
-button:hover {
-  border-color: #646cff;
-}
-button:focus,
-button:focus-visible {
-  outline: 4px auto -webkit-focus-ring-color;
-}
-
-@media (prefers-color-scheme: light) {
-  :root {
-    color: #213547;
-    background-color: #ffffff;
-  }
-  a:hover {
-    color: #747bff;
-  }
-  button {
-    background-color: #f9f9f9;
-  }
-}

compiler/fixtures/runtime-compat/app-19/src/main.tsx

@@ -1,10 +0,0 @@
-import {StrictMode} from 'react';
-import {createRoot} from 'react-dom/client';
-import App from './App.tsx';
-import './index.css';
-
-createRoot(document.getElementById('root')!).render(
-  <StrictMode>
-    <App />
-  </StrictMode>,
-);

compiler/fixtures/runtime-compat/app-19/src/vite-env.d.ts

@@ -1 +0,0 @@
-/// <reference types="vite/client" />

compiler/fixtures/runtime-compat/app-19/tsconfig.app.json

@@ -1,24 +0,0 @@
-{
-  "compilerOptions": {
-    "target": "ES2020",
-    "useDefineForClassFields": true,
-    "lib": ["ES2020", "DOM", "DOM.Iterable"],
-    "module": "ESNext",
-    "skipLibCheck": true,
-
-    /* Bundler mode */
-    "moduleResolution": "bundler",
-    "allowImportingTsExtensions": true,
-    "isolatedModules": true,
-    "moduleDetection": "force",
-    "noEmit": true,
-    "jsx": "react-jsx",
-
-    /* Linting */
-    "strict": true,
-    "noUnusedLocals": true,
-    "noUnusedParameters": true,
-    "noFallthroughCasesInSwitch": true
-  },
-  "include": ["src"]
-}

compiler/fixtures/runtime-compat/app-19/tsconfig.app.tsbuildinfo

@@ -1 +0,0 @@
-{"root":["./src/app.tsx","./src/main.tsx","./src/vite-env.d.ts"],"version":"5.6.3"}

compiler/fixtures/runtime-compat/app-19/tsconfig.json

@@ -1,7 +0,0 @@
-{
-  "files": [],
-  "references": [
-    { "path": "./tsconfig.app.json" },
-    { "path": "./tsconfig.node.json" }
-  ]
-}

compiler/fixtures/runtime-compat/app-19/tsconfig.node.json

@@ -1,22 +0,0 @@
-{
-  "compilerOptions": {
-    "target": "ES2022",
-    "lib": ["ES2023"],
-    "module": "ESNext",
-    "skipLibCheck": true,
-
-    /* Bundler mode */
-    "moduleResolution": "bundler",
-    "allowImportingTsExtensions": true,
-    "isolatedModules": true,
-    "moduleDetection": "force",
-    "noEmit": true,
-
-    /* Linting */
-    "strict": true,
-    "noUnusedLocals": true,
-    "noUnusedParameters": true,
-    "noFallthroughCasesInSwitch": true
-  },
-  "include": ["vite.config.ts"]
-}

compiler/fixtures/runtime-compat/app-19/tsconfig.node.tsbuildinfo

@@ -1 +0,0 @@
-{"root":["./vite.config.ts"],"version":"5.6.3"}

compiler/fixtures/runtime-compat/app-19/vite.config.ts

@@ -1,11 +0,0 @@
-import {defineConfig} from 'vite';
-import react from '@vitejs/plugin-react';
-
-// https://vitejs.dev/config/
-export default defineConfig({
-  plugins: [
-    react({
-      babel: {plugins: [['babel-plugin-react-compiler', {target: '19'}]]},
-    }),
-  ],
-});

compiler/fixtures/runtime-compat/lib/babel.config.js

@@ -1,10 +0,0 @@
-const plugins = [
-  [
-    'babel-plugin-react-compiler',
-    {
-      target: '18',
-    },
-  ],
-];
-
-module.exports = {plugins};

compiler/fixtures/runtime-compat/lib/index.js

@@ -1,13 +0,0 @@
-import {useState, useEffect} from 'react';
-
-export function useTime() {
-  const [time, setTime] = useState(() => new Date());
-  useEffect(() => {
-    const id = setInterval(() => {
-      setTime(new Date());
-    }, 1000);
-    return () => clearInterval(id);
-  }, []);
-
-  return time;
-}

compiler/fixtures/runtime-compat/lib/package.json

@@ -1,32 +0,0 @@
-{
-  "name": "runtime-compat-lib",
-  "version": "0.0.0",
-  "description": "Testing ground for libraries compiled with React Compiler",
-  "main": "dist/index.js",
-  "scripts": {
-    "build": "rimraf dist && rollup --config --bundleConfigAsCjs",
-    "test": "echo 'no tests'"
-  },
-  "license": "MIT",
-  "devDependencies": {
-    "@babel/cli": "^7.25.7",
-    "@babel/core": "^7.25.7",
-    "@babel/preset-env": "^7.25.7",
-    "@rollup/plugin-babel": "^6.0.4",
-    "@rollup/plugin-json": "^6.1.0",
-    "babel-plugin-react-compiler": "19.0.0-beta-9ee70a1-20241017",
-    "@rollup/plugin-terser": "^0.4.4",
-    "react": "19.0.0-beta-26f2496093-20240514",
-    "react-dom": "19.0.0-beta-26f2496093-20240514",
-    "rimraf": "5",
-    "rollup": "^4.22.4",
-    "rollup-plugin-banner2": "^1.2.3",
-    "rollup-plugin-prettier": "^4.1.1"
-  },
-  "dependencies": {
-    "react-compiler-runtime": "19.0.0-beta-9ee70a1-20241017"
-  },
-  "peerDependencies": {
-    "react": "^18 || ^19"
-  }
-}

compiler/fixtures/runtime-compat/lib/rollup.config.js

@@ -1,51 +0,0 @@
-/**
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-import json from '@rollup/plugin-json';
-import terser from '@rollup/plugin-terser';
-import prettier from 'rollup-plugin-prettier';
-import banner2 from 'rollup-plugin-banner2';
-import babel from '@rollup/plugin-babel';
-
-const ROLLUP_CONFIG = {
-  input: 'index.js',
-  output: {
-    file: 'dist/index.js',
-    format: 'esm',
-    sourcemap: false,
-    exports: 'named',
-  },
-  plugins: [
-    json(),
-    babel({babelHelpers: 'bundled'}),
-    terser({
-      format: {
-        comments: false,
-      },
-      compress: false,
-      mangle: false,
-    }),
-    prettier(),
-    banner2(
-      () => `/**
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @lightSyntaxTransform
- * @noflow
- * @nolint
- * @preventMunge
- * @preserve-invariant-messages
- */
-`
-    ),
-  ],
-};
-
-export default ROLLUP_CONFIG;

compiler/fixtures/runtime-compat/setup.sh

@@ -1,13 +0,0 @@
-#!/usr/bin/env bash
-# Copyright (c) Meta Platforms, Inc. and affiliates.
-#
-# This source code is licensed under the MIT license found in the
-# LICENSE file in the root directory of this source tree.
-
-set -eo pipefail
-
-HERE=$(pwd)
-
-cd lib && yarn --silent link
-cd $HERE/app-18 && yarn --silent link runtime-compat-lib
-cd $HERE/app-19 && yarn --silent link runtime-compat-lib

compiler/packages/babel-plugin-react-compiler/src/Entrypoint/Pipeline.ts

@@ -57,7 +57,6 @@ import {
   mergeReactiveScopesThatInvalidateTogether,
   promoteUsedTemporaries,
   propagateEarlyReturns,
-  propagateScopeDependencies,
   pruneHoistedContexts,
   pruneNonEscapingScopes,
   pruneNonReactiveDependencies,
@@ -348,14 +347,12 @@ function* runWithEnvironment(
   });
   assertTerminalSuccessorsExist(hir);
   assertTerminalPredsExist(hir);
-  if (env.config.enablePropagateDepsInHIR) {
-    propagateScopeDependenciesHIR(hir);
-    yield log({
-      kind: 'hir',
-      name: 'PropagateScopeDependenciesHIR',
-      value: hir,
-    });
-  }
+  propagateScopeDependenciesHIR(hir);
+  yield log({
+    kind: 'hir',
+    name: 'PropagateScopeDependenciesHIR',
+    value: hir,
+  });
 
   if (env.config.inlineJsxTransform) {
     inlineJsxTransform(hir, env.config.inlineJsxTransform);
@@ -383,15 +380,6 @@ function* runWithEnvironment(
   });
   assertScopeInstructionsWithinScopes(reactiveFunction);
 
-  if (!env.config.enablePropagateDepsInHIR) {
-    propagateScopeDependencies(reactiveFunction);
-    yield log({
-      kind: 'reactive',
-      name: 'PropagateScopeDependencies',
-      value: reactiveFunction,
-    });
-  }
-
   pruneNonEscapingScopes(reactiveFunction);
   yield log({
     kind: 'reactive',

compiler/packages/babel-plugin-react-compiler/src/HIR/CollectHoistablePropertyLoads.ts

@@ -1,5 +1,6 @@
 import {CompilerError} from '../CompilerError';
 import {inRange} from '../ReactiveScopes/InferReactiveScopeVariables';
+import {printDependency} from '../ReactiveScopes/PrintReactiveFunction';
 import {
   Set_equal,
   Set_filter,
@@ -7,7 +8,6 @@ import {
   Set_union,
   getOrInsertDefault,
 } from '../Utils/utils';
-import {collectOptionalChainSidemap} from './CollectOptionalChainDependencies';
 import {
   BasicBlock,
   BlockId,
@@ -21,7 +21,8 @@ import {
   ReactiveScopeDependency,
   ScopeId,
 } from './HIR';
-import {collectTemporariesSidemap} from './PropagateScopeDependenciesHIR';
+
+const DEBUG_PRINT = false;
 
 /**
  * Helper function for `PropagateScopeDependencies`. Uses control flow graph
@@ -86,15 +87,8 @@ export function collectHoistablePropertyLoads(
   fn: HIRFunction,
   temporaries: ReadonlyMap<IdentifierId, ReactiveScopeDependency>,
   hoistableFromOptionals: ReadonlyMap<BlockId, ReactiveScopeDependency>,
-  nestedFnImmutableContext: ReadonlySet<IdentifierId> | null,
 ): ReadonlyMap<BlockId, BlockInfo> {
   const registry = new PropertyPathRegistry();
-
-  const functionExpressionLoads = collectFunctionExpressionFakeLoads(fn);
-  const actuallyEvaluatedTemporaries = new Map(
-    [...temporaries].filter(([id]) => !functionExpressionLoads.has(id)),
-  );
-
   /**
    * Due to current limitations of mutable range inference, there are edge cases in
    * which we infer known-immutable values (e.g. props or hook params) to have a
@@ -111,14 +105,51 @@ export function collectHoistablePropertyLoads(
       }
     }
   }
-  const nodes = collectNonNullsInBlocks(fn, {
-    temporaries: actuallyEvaluatedTemporaries,
+  return collectHoistablePropertyLoadsImpl(fn, {
+    temporaries,
     knownImmutableIdentifiers,
     hoistableFromOptionals,
     registry,
-    nestedFnImmutableContext,
+    nestedFnImmutableContext: null,
   });
-  propagateNonNull(fn, nodes, registry);
+}
+
+type CollectHoistablePropertyLoadsContext = {
+  temporaries: ReadonlyMap<IdentifierId, ReactiveScopeDependency>;
+  knownImmutableIdentifiers: ReadonlySet<IdentifierId>;
+  hoistableFromOptionals: ReadonlyMap<BlockId, ReactiveScopeDependency>;
+  registry: PropertyPathRegistry;
+  /**
+   * (For nested / inner function declarations)
+   * Context variables (i.e. captured from an outer scope) that are immutable.
+   * Note that this technically could be merged into `knownImmutableIdentifiers`,
+   * but are currently kept separate for readability.
+   */
+  nestedFnImmutableContext: ReadonlySet<IdentifierId> | null;
+};
+function collectHoistablePropertyLoadsImpl(
+  fn: HIRFunction,
+  context: CollectHoistablePropertyLoadsContext,
+): ReadonlyMap<BlockId, BlockInfo> {
+  const functionExpressionLoads = collectFunctionExpressionFakeLoads(fn);
+  const actuallyEvaluatedTemporaries = new Map(
+    [...context.temporaries].filter(([id]) => !functionExpressionLoads.has(id)),
+  );
+
+  const nodes = collectNonNullsInBlocks(fn, {
+    ...context,
+    temporaries: actuallyEvaluatedTemporaries,
+  });
+  propagateNonNull(fn, nodes, context.registry);
+
+  if (DEBUG_PRINT) {
+    console.log('(printing hoistable nodes in blocks)');
+    for (const [blockId, node] of nodes) {
+      console.log(
+        `bb${blockId}: ${[...node.assumedNonNullObjects].map(n => printDependency(n.fullPath)).join(' ')}`,
+      );
+    }
+  }
 
   return nodes;
 }
@@ -243,7 +274,7 @@ class PropertyPathRegistry {
 
 function getMaybeNonNullInInstruction(
   instr: InstructionValue,
-  context: CollectNonNullsInBlocksContext,
+  context: CollectHoistablePropertyLoadsContext,
 ): PropertyPathNode | null {
   let path = null;
   if (instr.kind === 'PropertyLoad') {
@@ -262,7 +293,7 @@ function getMaybeNonNullInInstruction(
 function isImmutableAtInstr(
   identifier: Identifier,
   instr: InstructionId,
-  context: CollectNonNullsInBlocksContext,
+  context: CollectHoistablePropertyLoadsContext,
 ): boolean {
   if (context.nestedFnImmutableContext != null) {
     /**
@@ -295,22 +326,9 @@ function isImmutableAtInstr(
   }
 }
 
-type CollectNonNullsInBlocksContext = {
-  temporaries: ReadonlyMap<IdentifierId, ReactiveScopeDependency>;
-  knownImmutableIdentifiers: ReadonlySet<IdentifierId>;
-  hoistableFromOptionals: ReadonlyMap<BlockId, ReactiveScopeDependency>;
-  registry: PropertyPathRegistry;
-  /**
-   * (For nested / inner function declarations)
-   * Context variables (i.e. captured from an outer scope) that are immutable.
-   * Note that this technically could be merged into `knownImmutableIdentifiers`,
-   * but are currently kept separate for readability.
-   */
-  nestedFnImmutableContext: ReadonlySet<IdentifierId> | null;
-};
 function collectNonNullsInBlocks(
   fn: HIRFunction,
-  context: CollectNonNullsInBlocksContext,
+  context: CollectHoistablePropertyLoadsContext,
 ): ReadonlyMap<BlockId, BlockInfo> {
   /**
    * Known non-null objects such as functional component props can be safely
@@ -348,27 +366,25 @@ function collectNonNullsInBlocks(
         assumedNonNullObjects.add(maybeNonNull);
       }
       if (
-        instr.value.kind === 'FunctionExpression' &&
+        (instr.value.kind === 'FunctionExpression' ||
+          instr.value.kind === 'ObjectMethod') &&
         !fn.env.config.enableTreatFunctionDepsAsConditional
       ) {
         const innerFn = instr.value.loweredFunc;
-        const innerTemporaries = collectTemporariesSidemap(
+        const innerHoistableMap = collectHoistablePropertyLoadsImpl(
           innerFn.func,
-          new Set(),
-        );
-        const innerOptionals = collectOptionalChainSidemap(innerFn.func);
-        const innerHoistableMap = collectHoistablePropertyLoads(
-          innerFn.func,
-          innerTemporaries,
-          innerOptionals.hoistableObjects,
-          context.nestedFnImmutableContext ??
-            new Set(
-              innerFn.func.context
-                .filter(place =>
-                  isImmutableAtInstr(place.identifier, instr.id, context),
-                )
-                .map(place => place.identifier.id),
-            ),
+          {
+            ...context,
+            nestedFnImmutableContext:
+              context.nestedFnImmutableContext ??
+              new Set(
+                innerFn.func.context
+                  .filter(place =>
+                    isImmutableAtInstr(place.identifier, instr.id, context),
+                  )
+                  .map(place => place.identifier.id),
+              ),
+          },
         );
         const innerHoistables = assertNonNull(
           innerHoistableMap.get(innerFn.func.body.entry),
@@ -591,7 +607,10 @@ function collectFunctionExpressionFakeLoads(
 
   for (const [_, block] of fn.body.blocks) {
     for (const {lvalue, value} of block.instructions) {
-      if (value.kind === 'FunctionExpression') {
+      if (
+        value.kind === 'FunctionExpression' ||
+        value.kind === 'ObjectMethod'
+      ) {
         for (const reference of value.loweredFunc.dependencies) {
           let curr: IdentifierId | undefined = reference.identifier.id;
           while (curr != null) {

compiler/packages/babel-plugin-react-compiler/src/HIR/CollectOptionalChainDependencies.ts

@@ -3,7 +3,6 @@ import {assertNonNull} from './CollectHoistablePropertyLoads';
 import {
   BlockId,
   BasicBlock,
-  InstructionId,
   IdentifierId,
   ReactiveScopeDependency,
   BranchTerminal,
@@ -15,6 +14,8 @@ import {
   OptionalTerminal,
   HIRFunction,
   DependencyPathEntry,
+  Instruction,
+  Terminal,
 } from './HIR';
 import {printIdentifier} from './PrintHIR';
 
@@ -22,25 +23,14 @@ export function collectOptionalChainSidemap(
   fn: HIRFunction,
 ): OptionalChainSidemap {
   const context: OptionalTraversalContext = {
+    currFn: fn,
     blocks: fn.body.blocks,
     seenOptionals: new Set(),
     processedInstrsInOptional: new Set(),
     temporariesReadInOptional: new Map(),
     hoistableObjects: new Map(),
   };
-  for (const [_, block] of fn.body.blocks) {
-    if (
-      block.terminal.kind === 'optional' &&
-      !context.seenOptionals.has(block.id)
-    ) {
-      traverseOptionalBlock(
-        block as TBasicBlock<OptionalTerminal>,
-        context,
-        null,
-      );
-    }
-  }
-
+  traverseFunction(fn, context);
   return {
     temporariesReadInOptional: context.temporariesReadInOptional,
     processedInstrsInOptional: context.processedInstrsInOptional,
@@ -96,8 +86,10 @@ export type OptionalChainSidemap = {
    * bb5:
    *   $5 = MethodCall $2.$4() <--- here, we want to take a dep on $2 and $4!
    * ```
+   *
+   * Also note that InstructionIds are not unique across inner functions.
    */
-  processedInstrsInOptional: ReadonlySet<InstructionId>;
+  processedInstrsInOptional: ReadonlySet<Instruction | Terminal>;
   /**
    * Records optional chains for which we can safely evaluate non-optional
    * PropertyLoads. e.g. given `a?.b.c`, we can evaluate any load from `a?.b` at
@@ -115,16 +107,46 @@ export type OptionalChainSidemap = {
 };
 
 type OptionalTraversalContext = {
+  currFn: HIRFunction;
   blocks: ReadonlyMap<BlockId, BasicBlock>;
 
   // Track optional blocks to avoid outer calls into nested optionals
   seenOptionals: Set<BlockId>;
 
-  processedInstrsInOptional: Set<InstructionId>;
+  processedInstrsInOptional: Set<Instruction | Terminal>;
   temporariesReadInOptional: Map<IdentifierId, ReactiveScopeDependency>;
   hoistableObjects: Map<BlockId, ReactiveScopeDependency>;
 };
 
+function traverseFunction(
+  fn: HIRFunction,
+  context: OptionalTraversalContext,
+): void {
+  for (const [_, block] of fn.body.blocks) {
+    for (const instr of block.instructions) {
+      if (
+        instr.value.kind === 'FunctionExpression' ||
+        instr.value.kind === 'ObjectMethod'
+      ) {
+        traverseFunction(instr.value.loweredFunc.func, {
+          ...context,
+          currFn: instr.value.loweredFunc.func,
+          blocks: instr.value.loweredFunc.func.body.blocks,
+        });
+      }
+    }
+    if (
+      block.terminal.kind === 'optional' &&
+      !context.seenOptionals.has(block.id)
+    ) {
+      traverseOptionalBlock(
+        block as TBasicBlock<OptionalTerminal>,
+        context,
+        null,
+      );
+    }
+  }
+}
 /**
  * Match the consequent and alternate blocks of an optional.
  * @returns propertyload computed by the consequent block, or null if the
@@ -137,7 +159,7 @@ function matchOptionalTestBlock(
   consequentId: IdentifierId;
   property: string;
   propertyId: IdentifierId;
-  storeLocalInstrId: InstructionId;
+  storeLocalInstr: Instruction;
   consequentGoto: BlockId;
 } | null {
   const consequentBlock = assertNonNull(blocks.get(terminal.consequent));
@@ -149,7 +171,7 @@ function matchOptionalTestBlock(
     const propertyLoad: TInstruction<PropertyLoad> = consequentBlock
       .instructions[0] as TInstruction<PropertyLoad>;
     const storeLocal: StoreLocal = consequentBlock.instructions[1].value;
-    const storeLocalInstrId = consequentBlock.instructions[1].id;
+    const storeLocalInstr = consequentBlock.instructions[1];
     CompilerError.invariant(
       propertyLoad.value.object.identifier.id === terminal.test.identifier.id,
       {
@@ -189,7 +211,7 @@ function matchOptionalTestBlock(
       consequentId: storeLocal.lvalue.place.identifier.id,
       property: propertyLoad.value.property,
       propertyId: propertyLoad.lvalue.identifier.id,
-      storeLocalInstrId,
+      storeLocalInstr,
       consequentGoto: consequentBlock.terminal.block,
     };
   }
@@ -369,10 +391,8 @@ function traverseOptionalBlock(
       },
     ],
   };
-  context.processedInstrsInOptional.add(
-    matchConsequentResult.storeLocalInstrId,
-  );
-  context.processedInstrsInOptional.add(test.id);
+  context.processedInstrsInOptional.add(matchConsequentResult.storeLocalInstr);
+  context.processedInstrsInOptional.add(test);
   context.temporariesReadInOptional.set(
     matchConsequentResult.consequentId,
     load,

compiler/packages/babel-plugin-react-compiler/src/HIR/Environment.ts

@@ -69,8 +69,8 @@ export const ExternalFunctionSchema = z.object({
 export const InstrumentationSchema = z
   .object({
     fn: ExternalFunctionSchema,
-    gating: ExternalFunctionSchema.nullish(),
-    globalGating: z.string().nullish(),
+    gating: ExternalFunctionSchema.nullable(),
+    globalGating: z.string().nullable(),
   })
   .refine(
     opts => opts.gating != null || opts.globalGating != null,
@@ -147,7 +147,7 @@ export type Hook = z.infer<typeof HookSchema>;
  */
 
 const EnvironmentConfigSchema = z.object({
-  customHooks: z.map(z.string(), HookSchema).optional().default(new Map()),
+  customHooks: z.map(z.string(), HookSchema).default(new Map()),
 
   /**
    * A function that, given the name of a module, can optionally return a description
@@ -231,16 +231,6 @@ const EnvironmentConfigSchema = z.object({
    */
   enableUseTypeAnnotations: z.boolean().default(false),
 
-  enablePropagateDepsInHIR: z.boolean().default(false),
-
-  /**
-   * Enables inference of optional dependency chains. Without this flag
-   * a property chain such as `props?.items?.foo` will infer as a dep on
-   * just `props`. With this flag enabled, we'll infer that full path as
-   * the dependency.
-   */
-  enableOptionalDependencies: z.boolean().default(true),
-
   /**
    * Enables inlining ReactElement object literals in place of JSX
    * An alternative to the standard JSX transform which replaces JSX with React's jsxProd() runtime
@@ -248,7 +238,7 @@ const EnvironmentConfigSchema = z.object({
    *
    * The symbol configuration is set for backwards compatability with pre-React 19 transforms
    */
-  inlineJsxTransform: ReactElementSymbolSchema.nullish(),
+  inlineJsxTransform: ReactElementSymbolSchema.nullable().default(null),
 
   /*
    * Enable validation of hooks to partially check that the component honors the rules of hooks.
@@ -339,9 +329,9 @@ const EnvironmentConfigSchema = z.object({
    *     }
    *   }
    */
-  enableEmitFreeze: ExternalFunctionSchema.nullish(),
+  enableEmitFreeze: ExternalFunctionSchema.nullable().default(null),
 
-  enableEmitHookGuards: ExternalFunctionSchema.nullish(),
+  enableEmitHookGuards: ExternalFunctionSchema.nullable().default(null),
 
   /**
    * Enable instruction reordering. See InstructionReordering.ts for the details
@@ -425,7 +415,7 @@ const EnvironmentConfigSchema = z.object({
    *   }
    *
    */
-  enableEmitInstrumentForget: InstrumentationSchema.nullish(),
+  enableEmitInstrumentForget: InstrumentationSchema.nullable().default(null),
 
   // Enable validation of mutable ranges
   assertValidMutableRanges: z.boolean().default(false),
@@ -464,8 +454,6 @@ const EnvironmentConfigSchema = z.object({
    */
   throwUnknownException__testonly: z.boolean().default(false),
 
-  enableSharedRuntime__testonly: z.boolean().default(false),
-
   /**
    * Enables deps of a function epxression to be treated as conditional. This
    * makes sure we don't load a dep when it's a property (to check if it has
@@ -503,7 +491,8 @@ const EnvironmentConfigSchema = z.object({
    * computed one. This detects cases where rules of react violations may cause the
    * compiled code to behave differently than the original.
    */
-  enableChangeDetectionForDebugging: ExternalFunctionSchema.nullish(),
+  enableChangeDetectionForDebugging:
+    ExternalFunctionSchema.nullable().default(null),
 
   /**
    * The react native re-animated library uses custom Babel transforms that
@@ -543,7 +532,7 @@ const EnvironmentConfigSchema = z.object({
    *
    * Here the variables `ref` and `myRef` will be typed as Refs.
    */
-  enableTreatRefLikeIdentifiersAsRefs: z.boolean().nullable().default(false),
+  enableTreatRefLikeIdentifiersAsRefs: z.boolean().default(false),
 
   /*
    * If specified a value, the compiler lowers any calls to `useContext` to use
@@ -565,12 +554,57 @@ const EnvironmentConfigSchema = z.object({
    * const {foo, bar} = useCompiledContext(MyContext, (c) => [c.foo, c.bar]);
    * ```
    */
-  lowerContextAccess: ExternalFunctionSchema.nullish(),
+  lowerContextAccess: ExternalFunctionSchema.nullable().default(null),
 });
 
 export type EnvironmentConfig = z.infer<typeof EnvironmentConfigSchema>;
 
-export function parseConfigPragma(pragma: string): EnvironmentConfig {
+/**
+ * For test fixtures and playground only.
+ *
+ * Pragmas are straightforward to parse for boolean options (`:true` and
+ * `:false`). These are 'enabled' config values for non-boolean configs (i.e.
+ * what is used when parsing `:true`).
+ */
+const testComplexConfigDefaults: PartialEnvironmentConfig = {
+  validateNoCapitalizedCalls: [],
+  enableChangeDetectionForDebugging: {
+    source: 'react-compiler-runtime',
+    importSpecifierName: '$structuralCheck',
+  },
+  enableEmitFreeze: {
+    source: 'react-compiler-runtime',
+    importSpecifierName: 'makeReadOnly',
+  },
+  enableEmitInstrumentForget: {
+    fn: {
+      source: 'react-compiler-runtime',
+      importSpecifierName: 'useRenderCounter',
+    },
+    gating: {
+      source: 'react-compiler-runtime',
+      importSpecifierName: 'shouldInstrument',
+    },
+    globalGating: '__DEV__',
+  },
+  enableEmitHookGuards: {
+    source: 'react-compiler-runtime',
+    importSpecifierName: '$dispatcherGuard',
+  },
+  inlineJsxTransform: {
+    elementSymbol: 'react.transitional.element',
+    globalDevVar: 'DEV',
+  },
+  lowerContextAccess: {
+    source: 'react-compiler-runtime',
+    importSpecifierName: 'useContext_withSelector',
+  },
+};
+
+/**
+ * For snap test fixtures and playground only.
+ */
+export function parseConfigPragmaForTests(pragma: string): EnvironmentConfig {
   const maybeConfig: any = {};
   // Get the defaults to programmatically check for boolean properties
   const defaultConfig = EnvironmentConfigSchema.parse({});
@@ -580,21 +614,12 @@ export function parseConfigPragma(pragma: string): EnvironmentConfig {
       continue;
     }
     const keyVal = token.slice(1);
-    let [key, val]: any = keyVal.split(':');
+    let [key, val = undefined] = keyVal.split(':');
+    const isSet = val === undefined || val === 'true';
 
-    if (key === 'validateNoCapitalizedCalls') {
-      maybeConfig[key] = [];
-      continue;
-    }
-
-    if (
-      key === 'enableChangeDetectionForDebugging' &&
-      (val === undefined || val === 'true')
-    ) {
-      maybeConfig[key] = {
-        source: 'react-compiler-runtime',
-        importSpecifierName: '$structuralCheck',
-      };
+    if (isSet && key in testComplexConfigDefaults) {
+      maybeConfig[key] =
+        testComplexConfigDefaults[key as keyof PartialEnvironmentConfig];
       continue;
     }
 
@@ -609,7 +634,6 @@ export function parseConfigPragma(pragma: string): EnvironmentConfig {
             props.push({type: 'name', name: elt});
           }
         }
-        console.log([valSplit[0], props.map(x => x.name ?? '*').join('.')]);
         maybeConfig[key] = [[valSplit[0], props]];
       }
       continue;
@@ -620,11 +644,10 @@ export function parseConfigPragma(pragma: string): EnvironmentConfig {
       continue;
     }
     if (val === undefined || val === 'true') {
-      val = true;
+      maybeConfig[key] = true;
     } else {
-      val = false;
+      maybeConfig[key] = false;
     }
-    maybeConfig[key] = val;
   }
 
   const config = EnvironmentConfigSchema.safeParse(maybeConfig);

compiler/packages/babel-plugin-react-compiler/src/HIR/PropagateScopeDependenciesHIR.ts

@@ -16,6 +16,7 @@ import {
   DeclarationId,
   areEqualPaths,
   IdentifierId,
+  Terminal,
 } from './HIR';
 import {
   collectHoistablePropertyLoads,
@@ -46,7 +47,7 @@ export function propagateScopeDependenciesHIR(fn: HIRFunction): void {
 
   const hoistablePropertyLoads = keyByScopeId(
     fn,
-    collectHoistablePropertyLoads(fn, temporaries, hoistableObjects, null),
+    collectHoistablePropertyLoads(fn, temporaries, hoistableObjects),
   );
 
   const scopeDeps = collectDependencies(
@@ -176,8 +177,10 @@ function findTemporariesUsedOutsideDeclaringScope(
  * $2 = LoadLocal 'foo'
  * $3 = CallExpression $2($1)
  * ```
- * Only map LoadLocal and PropertyLoad lvalues to their source if we know that
- * reordering the read (from the time-of-load to time-of-use) is valid.
+ * @param usedOutsideDeclaringScope is used to check the correctness of
+ * reordering LoadLocal / PropertyLoad calls. We only track a LoadLocal /
+ * PropertyLoad in the returned temporaries map if reordering the read (from the
+ * time-of-load to time-of-use) is valid.
  *
  * If a LoadLocal or PropertyLoad instruction is within the reactive scope range
  * (a proxy for mutable range) of the load source, later instructions may
@@ -215,7 +218,29 @@ export function collectTemporariesSidemap(
   fn: HIRFunction,
   usedOutsideDeclaringScope: ReadonlySet<DeclarationId>,
 ): ReadonlyMap<IdentifierId, ReactiveScopeDependency> {
-  const temporaries = new Map<IdentifierId, ReactiveScopeDependency>();
+  const temporaries = new Map();
+  collectTemporariesSidemapImpl(
+    fn,
+    usedOutsideDeclaringScope,
+    temporaries,
+    false,
+  );
+  return temporaries;
+}
+
+/**
+ * Recursive collect a sidemap of all `LoadLocal` and `PropertyLoads` with a
+ * function and all nested functions.
+ *
+ * Note that IdentifierIds are currently unique, so we can use a single
+ * Map<IdentifierId, ...> across all nested functions.
+ */
+function collectTemporariesSidemapImpl(
+  fn: HIRFunction,
+  usedOutsideDeclaringScope: ReadonlySet<DeclarationId>,
+  temporaries: Map<IdentifierId, ReactiveScopeDependency>,
+  isInnerFn: boolean,
+): void {
   for (const [_, block] of fn.body.blocks) {
     for (const instr of block.instructions) {
       const {value, lvalue} = instr;
@@ -224,27 +249,51 @@ export function collectTemporariesSidemap(
       );
 
       if (value.kind === 'PropertyLoad' && !usedOutside) {
-        const property = getProperty(
-          value.object,
-          value.property,
-          false,
-          temporaries,
-        );
-        temporaries.set(lvalue.identifier.id, property);
+        if (!isInnerFn || temporaries.has(value.object.identifier.id)) {
+          /**
+           * All dependencies of a inner / nested function must have a base
+           * identifier from the outermost component / hook. This is because the
+           * compiler cannot break an inner function into multiple granular
+           * scopes.
+           */
+          const property = getProperty(
+            value.object,
+            value.property,
+            false,
+            temporaries,
+          );
+          temporaries.set(lvalue.identifier.id, property);
+        }
       } else if (
         value.kind === 'LoadLocal' &&
         lvalue.identifier.name == null &&
         value.place.identifier.name !== null &&
         !usedOutside
       ) {
-        temporaries.set(lvalue.identifier.id, {
-          identifier: value.place.identifier,
-          path: [],
-        });
+        if (
+          !isInnerFn ||
+          fn.context.some(
+            context => context.identifier.id === value.place.identifier.id,
+          )
+        ) {
+          temporaries.set(lvalue.identifier.id, {
+            identifier: value.place.identifier,
+            path: [],
+          });
+        }
+      } else if (
+        value.kind === 'FunctionExpression' ||
+        value.kind === 'ObjectMethod'
+      ) {
+        collectTemporariesSidemapImpl(
+          value.loweredFunc.func,
+          usedOutsideDeclaringScope,
+          temporaries,
+          true,
+        );
       }
     }
   }
-  return temporaries;
 }
 
 function getProperty(
@@ -310,6 +359,12 @@ class Context {
   #temporaries: ReadonlyMap<IdentifierId, ReactiveScopeDependency>;
   #temporariesUsedOutsideScope: ReadonlySet<DeclarationId>;
 
+  /**
+   * Tracks the traversal state. See Context.declare for explanation of why this
+   * is needed.
+   */
+  inInnerFn: boolean = false;
+
   constructor(
     temporariesUsedOutsideScope: ReadonlySet<DeclarationId>,
     temporaries: ReadonlyMap<IdentifierId, ReactiveScopeDependency>,
@@ -360,12 +415,23 @@ class Context {
   }
 
   /*
-   * Records where a value was declared, and optionally, the scope where the value originated from.
-   * This is later used to determine if a dependency should be added to a scope; if the current
-   * scope we are visiting is the same scope where the value originates, it can't be a dependency
-   * on itself.
+   * Records where a value was declared, and optionally, the scope where the
+   * value originated from. This is later used to determine if a dependency
+   * should be added to a scope; if the current scope we are visiting is the
+   * same scope where the value originates, it can't be a dependency on itself.
+   *
+   * Note that we do not track declarations or reassignments within inner
+   * functions for the following reasons:
+   *   - inner functions cannot be split by scope boundaries and are guaranteed
+   *     to consume their own declarations
+   *   - reassignments within inner functions are tracked as context variables,
+   *     which already have extended mutable ranges to account for reassignments
+   *   - *most importantly* it's currently simply incorrect to compare inner
+   *     function instruction ids (tracked by `decl`) with outer ones (as stored
+   *     by root identifier mutable ranges).
    */
   declare(identifier: Identifier, decl: Decl): void {
+    if (this.inInnerFn) return;
     if (!this.#declarations.has(identifier.declarationId)) {
       this.#declarations.set(identifier.declarationId, decl);
     }
@@ -575,7 +641,7 @@ function collectDependencies(
   fn: HIRFunction,
   usedOutsideDeclaringScope: ReadonlySet<DeclarationId>,
   temporaries: ReadonlyMap<IdentifierId, ReactiveScopeDependency>,
-  processedInstrsInOptional: ReadonlySet<InstructionId>,
+  processedInstrsInOptional: ReadonlySet<Instruction | Terminal>,
 ): Map<ReactiveScope, Array<ReactiveScopeDependency>> {
   const context = new Context(usedOutsideDeclaringScope, temporaries);
 
@@ -614,12 +680,12 @@ function collectDependencies(
       }
     }
     for (const instr of block.instructions) {
-      if (!processedInstrsInOptional.has(instr.id)) {
+      if (!processedInstrsInOptional.has(instr)) {
         handleInstruction(instr, context);
       }
     }
 
-    if (!processedInstrsInOptional.has(block.terminal.id)) {
+    if (!processedInstrsInOptional.has(block.terminal)) {
       for (const place of eachTerminalOperand(block.terminal)) {
         context.visitOperand(place);
       }

compiler/packages/babel-plugin-react-compiler/src/HIR/index.ts

@@ -17,7 +17,7 @@ export {buildReactiveScopeTerminalsHIR} from './BuildReactiveScopeTerminalsHIR';
 export {computeDominatorTree, computePostDominatorTree} from './Dominator';
 export {
   Environment,
-  parseConfigPragma,
+  parseConfigPragmaForTests,
   validateEnvironmentConfig,
   type EnvironmentConfig,
   type ExternalFunction,

compiler/packages/babel-plugin-react-compiler/src/HIR/visitors.ts

@@ -1215,9 +1215,17 @@ export class ScopeBlockTraversal {
     }
   }
 
+  /**
+   * @returns if the given scope is currently 'active', i.e. if the scope start
+   * block but not the scope fallthrough has been recorded.
+   */
   isScopeActive(scopeId: ScopeId): boolean {
     return this.#activeScopes.indexOf(scopeId) !== -1;
   }
+
+  /**
+   * The current, innermost active scope.
+   */
   get currentScope(): ScopeId | null {
     return this.#activeScopes.at(-1) ?? null;
   }

compiler/packages/babel-plugin-react-compiler/src/Optimization/InlineJsxTransform.ts

@@ -383,6 +383,30 @@ export function inlineJsxTransform(
     mapTerminalOperands(block.terminal, place =>
       handlePlace(place, blockId, inlinedJsxDeclarations),
     );
+
+    if (block.terminal.kind === 'scope') {
+      const scope = block.terminal.scope;
+      for (const dep of scope.dependencies) {
+        dep.identifier = handleIdentifier(
+          dep.identifier,
+          inlinedJsxDeclarations,
+        );
+      }
+
+      for (const [origId, decl] of [...scope.declarations]) {
+        const newDecl = handleIdentifier(
+          decl.identifier,
+          inlinedJsxDeclarations,
+        );
+        if (newDecl.id !== origId) {
+          scope.declarations.delete(origId);
+          scope.declarations.set(decl.identifier.id, {
+            identifier: newDecl,
+            scope: decl.scope,
+          });
+        }
+      }
+    }
   }
 
   /**
@@ -697,10 +721,10 @@ function handlePlace(
     inlinedJsxDeclaration == null ||
     inlinedJsxDeclaration.blockIdsToIgnore.has(blockId)
   ) {
-    return {...place};
+    return place;
   }
 
-  return {...place, identifier: {...inlinedJsxDeclaration.identifier}};
+  return {...place, identifier: inlinedJsxDeclaration.identifier};
 }
 
 function handlelValue(
@@ -715,8 +739,20 @@ function handlelValue(
     inlinedJsxDeclaration == null ||
     inlinedJsxDeclaration.blockIdsToIgnore.has(blockId)
   ) {
-    return {...lvalue};
+    return lvalue;
   }
 
-  return {...lvalue, identifier: {...inlinedJsxDeclaration.identifier}};
+  return {...lvalue, identifier: inlinedJsxDeclaration.identifier};
+}
+
+function handleIdentifier(
+  identifier: Identifier,
+  inlinedJsxDeclarations: InlinedJsxDeclarationMap,
+): Identifier {
+  const inlinedJsxDeclaration = inlinedJsxDeclarations.get(
+    identifier.declarationId,
+  );
+  return inlinedJsxDeclaration == null
+    ? identifier
+    : inlinedJsxDeclaration.identifier;
 }

compiler/packages/babel-plugin-react-compiler/src/Optimization/OutlineJsx.ts

@@ -210,12 +210,30 @@ function process(
   return {instrs: newInstrs, fn: outlinedFn};
 }
 
+type OutlinedJsxAttribute = {
+  originalName: string;
+  newName: string;
+  place: Place;
+};
+
 function collectProps(
   instructions: Array<JsxInstruction>,
-): Array<JsxAttribute> | null {
-  const attributes: Array<JsxAttribute> = [];
+): Array<OutlinedJsxAttribute> | null {
+  let id = 1;
+
+  function generateName(oldName: string): string {
+    let newName = oldName;
+    while (seen.has(newName)) {
+      newName = `${oldName}${id++}`;
+    }
+    seen.add(newName);
+    return newName;
+  }
+
+  const attributes: Array<OutlinedJsxAttribute> = [];
   const jsxIds = new Set(instructions.map(i => i.lvalue.identifier.id));
   const seen: Set<string> = new Set();
+
   for (const instr of instructions) {
     const {value} = instr;
 
@@ -224,26 +242,30 @@ function collectProps(
         return null;
       }
 
-      /*
-       * TODO(gsn): Handle attributes that have same value across
-       * the outlined jsx instructions.
-       */
-      if (seen.has(at.name)) {
-        return null;
-      }
-
       if (at.kind === 'JsxAttribute') {
-        seen.add(at.name);
-        attributes.push(at);
+        const newName = generateName(at.name);
+        attributes.push({
+          originalName: at.name,
+          newName,
+          place: at.place,
+        });
       }
     }
 
-    // TODO(gsn): Add support for children that are not jsx expressions
-    if (
-      value.children &&
-      value.children.some(child => !jsxIds.has(child.identifier.id))
-    ) {
-      return null;
+    if (value.children) {
+      for (const child of value.children) {
+        if (jsxIds.has(child.identifier.id)) {
+          continue;
+        }
+
+        promoteTemporary(child.identifier);
+        const newName = generateName('t');
+        attributes.push({
+          originalName: child.identifier.name!.value,
+          newName: newName,
+          place: child,
+        });
+      }
     }
   }
   return attributes;
@@ -252,9 +274,15 @@ function collectProps(
 function emitOutlinedJsx(
   env: Environment,
   instructions: Array<Instruction>,
-  props: Array<JsxAttribute>,
+  outlinedProps: Array<OutlinedJsxAttribute>,
   outlinedTag: string,
 ): Array<Instruction> {
+  const props: Array<JsxAttribute> = outlinedProps.map(p => ({
+    kind: 'JsxAttribute',
+    name: p.newName,
+    place: p.place,
+  }));
+
   const loadJsx: Instruction = {
     id: makeInstructionId(0),
     loc: GeneratedSource,
@@ -290,7 +318,7 @@ function emitOutlinedJsx(
 function emitOutlinedFn(
   env: Environment,
   jsx: Array<JsxInstruction>,
-  oldProps: Array<JsxAttribute>,
+  oldProps: Array<OutlinedJsxAttribute>,
   globals: LoadGlobalMap,
 ): HIRFunction | null {
   const instructions: Array<Instruction> = [];
@@ -299,9 +327,11 @@ function emitOutlinedFn(
   const propsObj: Place = createTemporaryPlace(env, GeneratedSource);
   promoteTemporary(propsObj.identifier);
 
-  const destructurePropsInstr = emitDestructureProps(env, propsObj, [
-    ...oldToNewProps.values(),
-  ]);
+  const destructurePropsInstr = emitDestructureProps(
+    env,
+    propsObj,
+    oldToNewProps,
+  );
   instructions.push(destructurePropsInstr);
 
   const updatedJsxInstructions = emitUpdatedJsx(jsx, oldToNewProps);
@@ -368,9 +398,10 @@ function emitLoadGlobals(
 
 function emitUpdatedJsx(
   jsx: Array<JsxInstruction>,
-  oldToNewProps: Map<IdentifierId, ObjectProperty>,
+  oldToNewProps: Map<IdentifierId, OutlinedJsxAttribute>,
 ): Array<JsxInstruction> {
   const newInstrs: Array<JsxInstruction> = [];
+  const jsxIds = new Set(jsx.map(i => i.lvalue.identifier.id));
 
   for (const instr of jsx) {
     const {value} = instr;
@@ -390,16 +421,36 @@ function emitUpdatedJsx(
         `Expected a new property for ${printIdentifier(prop.place.identifier)}`,
       );
       newProps.push({
-        ...prop,
+        kind: 'JsxAttribute',
+        name: newProp.originalName,
         place: newProp.place,
       });
     }
 
+    let newChildren: Array<Place> | null = null;
+    if (value.children) {
+      newChildren = [];
+      for (const child of value.children) {
+        if (jsxIds.has(child.identifier.id)) {
+          newChildren.push({...child});
+          continue;
+        }
+
+        const newChild = oldToNewProps.get(child.identifier.id);
+        invariant(
+          newChild !== undefined,
+          `Expected a new prop for ${printIdentifier(child.identifier)}`,
+        );
+        newChildren.push({...newChild.place});
+      }
+    }
+
     newInstrs.push({
       ...instr,
       value: {
         ...value,
         props: newProps,
+        children: newChildren,
       },
     });
   }
@@ -409,31 +460,21 @@ function emitUpdatedJsx(
 
 function createOldToNewPropsMapping(
   env: Environment,
-  oldProps: Array<JsxAttribute>,
-): Map<IdentifierId, ObjectProperty> {
+  oldProps: Array<OutlinedJsxAttribute>,
+): Map<IdentifierId, OutlinedJsxAttribute> {
   const oldToNewProps = new Map();
 
   for (const oldProp of oldProps) {
-    invariant(
-      oldProp.kind === 'JsxAttribute',
-      `Expected only attributes but found ${oldProp.kind}`,
-    );
-
     // Do not read key prop in the outlined component
-    if (oldProp.name === 'key') {
+    if (oldProp.originalName === 'key') {
       continue;
     }
 
-    const newProp: ObjectProperty = {
-      kind: 'ObjectProperty',
-      key: {
-        kind: 'string',
-        name: oldProp.name,
-      },
-      type: 'property',
+    const newProp: OutlinedJsxAttribute = {
+      ...oldProp,
       place: createTemporaryPlace(env, GeneratedSource),
     };
-    newProp.place.identifier.name = makeIdentifierName(oldProp.name);
+    newProp.place.identifier.name = makeIdentifierName(oldProp.newName);
     oldToNewProps.set(oldProp.place.identifier.id, newProp);
   }
 
@@ -443,8 +484,21 @@ function createOldToNewPropsMapping(
 function emitDestructureProps(
   env: Environment,
   propsObj: Place,
-  properties: Array<ObjectProperty>,
+  oldToNewProps: Map<IdentifierId, OutlinedJsxAttribute>,
 ): Instruction {
+  const properties: Array<ObjectProperty> = [];
+  for (const [_, prop] of oldToNewProps) {
+    properties.push({
+      kind: 'ObjectProperty',
+      key: {
+        kind: 'string',
+        name: prop.newName,
+      },
+      type: 'property',
+      place: prop.place,
+    });
+  }
+
   const destructurePropsInstr: Instruction = {
     id: makeInstructionId(0),
     lvalue: createTemporaryPlace(env, GeneratedSource),

compiler/packages/babel-plugin-react-compiler/src/ReactiveScopes/CodegenReactiveFunction.ts

@@ -34,6 +34,7 @@ import {
   ReactiveInstruction,
   ReactiveScope,
   ReactiveScopeBlock,
+  ReactiveScopeDeclaration,
   ReactiveScopeDependency,
   ReactiveTerminal,
   ReactiveValue,
@@ -572,7 +573,8 @@ function codegenReactiveScope(
   const changeExpressions: Array<t.Expression> = [];
   const changeExpressionComments: Array<string> = [];
   const outputComments: Array<string> = [];
-  for (const dep of scope.dependencies) {
+
+  for (const dep of [...scope.dependencies].sort(compareScopeDependency)) {
     const index = cx.nextCacheIndex;
     changeExpressionComments.push(printDependencyComment(dep));
     const comparison = t.binaryExpression(
@@ -615,7 +617,10 @@ function codegenReactiveScope(
     );
   }
   let firstOutputIndex: number | null = null;
-  for (const [, {identifier}] of scope.declarations) {
+
+  for (const [, {identifier}] of [...scope.declarations].sort(([, a], [, b]) =>
+    compareScopeDeclaration(a, b),
+  )) {
     const index = cx.nextCacheIndex;
     if (firstOutputIndex === null) {
       firstOutputIndex = index;
@@ -2566,3 +2571,45 @@ function convertIdentifier(identifier: Identifier): t.Identifier {
   );
   return t.identifier(identifier.name.value);
 }
+
+function compareScopeDependency(
+  a: ReactiveScopeDependency,
+  b: ReactiveScopeDependency,
+): number {
+  CompilerError.invariant(
+    a.identifier.name?.kind === 'named' && b.identifier.name?.kind === 'named',
+    {
+      reason: '[Codegen] Expected named identifier for dependency',
+      loc: a.identifier.loc,
+    },
+  );
+  const aName = [
+    a.identifier.name.value,
+    ...a.path.map(entry => `${entry.optional ? '?' : ''}${entry.property}`),
+  ].join('.');
+  const bName = [
+    b.identifier.name.value,
+    ...b.path.map(entry => `${entry.optional ? '?' : ''}${entry.property}`),
+  ].join('.');
+  if (aName < bName) return -1;
+  else if (aName > bName) return 1;
+  else return 0;
+}
+
+function compareScopeDeclaration(
+  a: ReactiveScopeDeclaration,
+  b: ReactiveScopeDeclaration,
+): number {
+  CompilerError.invariant(
+    a.identifier.name?.kind === 'named' && b.identifier.name?.kind === 'named',
+    {
+      reason: '[Codegen] Expected named identifier for declaration',
+      loc: a.identifier.loc,
+    },
+  );
+  const aName = a.identifier.name.value;
+  const bName = b.identifier.name.value;
+  if (aName < bName) return -1;
+  else if (aName > bName) return 1;
+  else return 0;
+}

compiler/packages/babel-plugin-react-compiler/src/ReactiveScopes/index.ts

@@ -17,7 +17,6 @@ export {mergeReactiveScopesThatInvalidateTogether} from './MergeReactiveScopesTh
 export {printReactiveFunction} from './PrintReactiveFunction';
 export {promoteUsedTemporaries} from './PromoteUsedTemporaries';
 export {propagateEarlyReturns} from './PropagateEarlyReturns';
-export {propagateScopeDependencies} from './PropagateScopeDependencies';
 export {pruneAllReactiveScopes} from './PruneAllReactiveScopes';
 export {pruneHoistedContexts} from './PruneHoistedContexts';
 export {pruneNonEscapingScopes} from './PruneNonEscapingScopes';

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/allocating-primitive-as-dep-nested-scope.expect.md

@@ -47,7 +47,7 @@ import { identity, mutate, setProperty } from "shared-runtime";
 function AllocatingPrimitiveAsDepNested(props) {
   const $ = _c(5);
   let t0;
-  if ($[0] !== props.b || $[1] !== props.a) {
+  if ($[0] !== props.a || $[1] !== props.b) {
     const x = {};
     mutate(x);
     const t1 = identity(props.b) + 1;
@@ -62,8 +62,8 @@ function AllocatingPrimitiveAsDepNested(props) {
     const y = t2;
     setProperty(x, props.a);
     t0 = [x, y];
-    $[0] = props.b;
-    $[1] = props.a;
+    $[0] = props.a;
+    $[1] = props.b;
     $[2] = t0;
   } else {
     t0 = $[2];

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/array-at-effect.expect.md

@@ -41,7 +41,7 @@ function ArrayAtTest(props) {
   }
   const arr = t1;
   let t2;
-  if ($[4] !== props.y || $[5] !== arr) {
+  if ($[4] !== arr || $[5] !== props.y) {
     let t3;
     if ($[7] !== props.y) {
       t3 = bar(props.y);
@@ -51,8 +51,8 @@ function ArrayAtTest(props) {
       t3 = $[8];
     }
     t2 = arr.at(t3);
-    $[4] = props.y;
-    $[5] = arr;
+    $[4] = arr;
+    $[5] = props.y;
     $[6] = t2;
   } else {
     t2 = $[6];

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/array-expression-spread.expect.md

@@ -22,10 +22,10 @@ import { c as _c } from "react/compiler-runtime";
 function Component(props) {
   const $ = _c(3);
   let t0;
-  if ($[0] !== props.foo || $[1] !== props.bar) {
+  if ($[0] !== props.bar || $[1] !== props.foo) {
     t0 = [0, ...props.foo, null, ...props.bar, "z"];
-    $[0] = props.foo;
-    $[1] = props.bar;
+    $[0] = props.bar;
+    $[1] = props.foo;
     $[2] = t0;
   } else {
     t0 = $[2];

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/array-property-call.expect.md

@@ -24,18 +24,18 @@ export const FIXTURE_ENTRYPOINT = {
 import { c as _c } from "react/compiler-runtime";
 function Component(props) {
   const $ = _c(11);
-  let t0;
   let a;
+  let t0;
   if ($[0] !== props.a || $[1] !== props.b) {
     a = [props.a, props.b, "hello"];
     t0 = a.push(42);
     $[0] = props.a;
     $[1] = props.b;
-    $[2] = t0;
-    $[3] = a;
+    $[2] = a;
+    $[3] = t0;
   } else {
-    t0 = $[2];
-    a = $[3];
+    a = $[2];
+    t0 = $[3];
   }
   const x = t0;
   let t1;

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-aliased-capture-aliased-mutate.expect.md

@@ -0,0 +1,107 @@
+
+## Input
+
+```javascript
+// @flow @enableTransitivelyFreezeFunctionExpressions:false
+import {arrayPush, setPropertyByKey, Stringify} from 'shared-runtime';
+
+/**
+ * 1. `InferMutableRanges` derives the mutable range of identifiers and their
+ *     aliases from `LoadLocal`, `PropertyLoad`, etc
+ *   - After this pass, y's mutable range only extends to `arrayPush(x, y)`
+ *   - We avoid assigning mutable ranges to loads after y's mutable range, as
+ *     these are working with an immutable value. As a result, `LoadLocal y` and
+ *     `PropertyLoad y` do not get mutable ranges
+ * 2. `InferReactiveScopeVariables` extends mutable ranges and creates scopes,
+ *    as according to the 'co-mutation' of different values
+ *   - Here, we infer that
+ *     - `arrayPush(y, x)` might alias `x` and `y` to each other
+ *     - `setPropertyKey(x, ...)` may mutate both `x` and `y`
+ *   - This pass correctly extends the mutable range of `y`
+ *   - Since we didn't run `InferMutableRange` logic again, the LoadLocal /
+ *     PropertyLoads still don't have a mutable range
+ *
+ * Note that the this bug is an edge case. Compiler output is only invalid for:
+ *  - function expressions with
+ *    `enableTransitivelyFreezeFunctionExpressions:false`
+ *  - functions that throw and get retried without clearing the memocache
+ *
+ * Found differences in evaluator results
+ * Non-forget (expected):
+ *   (kind: ok)
+ *   <div>{"cb":{"kind":"Function","result":10},"shouldInvokeFns":true}</div>
+ *   <div>{"cb":{"kind":"Function","result":11},"shouldInvokeFns":true}</div>
+ * Forget:
+ *   (kind: ok)
+ *   <div>{"cb":{"kind":"Function","result":10},"shouldInvokeFns":true}</div>
+ *   <div>{"cb":{"kind":"Function","result":10},"shouldInvokeFns":true}</div>
+ */
+function useFoo({a, b}: {a: number, b: number}) {
+  const x = [];
+  const y = {value: a};
+
+  arrayPush(x, y); // x and y co-mutate
+  const y_alias = y;
+  const cb = () => y_alias.value;
+  setPropertyByKey(x[0], 'value', b); // might overwrite y.value
+  return <Stringify cb={cb} shouldInvokeFns={true} />;
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: useFoo,
+  params: [{a: 2, b: 10}],
+  sequentialRenders: [
+    {a: 2, b: 10},
+    {a: 2, b: 11},
+  ],
+};
+
+```
+
+## Code
+
+```javascript
+import { c as _c } from "react/compiler-runtime";
+import { arrayPush, setPropertyByKey, Stringify } from "shared-runtime";
+
+function useFoo(t0) {
+  const $ = _c(5);
+  const { a, b } = t0;
+  let t1;
+  if ($[0] !== a || $[1] !== b) {
+    const x = [];
+    const y = { value: a };
+
+    arrayPush(x, y);
+    const y_alias = y;
+    let t2;
+    if ($[3] !== y_alias.value) {
+      t2 = () => y_alias.value;
+      $[3] = y_alias.value;
+      $[4] = t2;
+    } else {
+      t2 = $[4];
+    }
+    const cb = t2;
+    setPropertyByKey(x[0], "value", b);
+    t1 = <Stringify cb={cb} shouldInvokeFns={true} />;
+    $[0] = a;
+    $[1] = b;
+    $[2] = t1;
+  } else {
+    t1 = $[2];
+  }
+  return t1;
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: useFoo,
+  params: [{ a: 2, b: 10 }],
+  sequentialRenders: [
+    { a: 2, b: 10 },
+    { a: 2, b: 11 },
+  ],
+};
+
+```
+      

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-aliased-capture-aliased-mutate.js

@@ -0,0 +1,53 @@
+// @flow @enableTransitivelyFreezeFunctionExpressions:false
+import {arrayPush, setPropertyByKey, Stringify} from 'shared-runtime';
+
+/**
+ * 1. `InferMutableRanges` derives the mutable range of identifiers and their
+ *     aliases from `LoadLocal`, `PropertyLoad`, etc
+ *   - After this pass, y's mutable range only extends to `arrayPush(x, y)`
+ *   - We avoid assigning mutable ranges to loads after y's mutable range, as
+ *     these are working with an immutable value. As a result, `LoadLocal y` and
+ *     `PropertyLoad y` do not get mutable ranges
+ * 2. `InferReactiveScopeVariables` extends mutable ranges and creates scopes,
+ *    as according to the 'co-mutation' of different values
+ *   - Here, we infer that
+ *     - `arrayPush(y, x)` might alias `x` and `y` to each other
+ *     - `setPropertyKey(x, ...)` may mutate both `x` and `y`
+ *   - This pass correctly extends the mutable range of `y`
+ *   - Since we didn't run `InferMutableRange` logic again, the LoadLocal /
+ *     PropertyLoads still don't have a mutable range
+ *
+ * Note that the this bug is an edge case. Compiler output is only invalid for:
+ *  - function expressions with
+ *    `enableTransitivelyFreezeFunctionExpressions:false`
+ *  - functions that throw and get retried without clearing the memocache
+ *
+ * Found differences in evaluator results
+ * Non-forget (expected):
+ *   (kind: ok)
+ *   <div>{"cb":{"kind":"Function","result":10},"shouldInvokeFns":true}</div>
+ *   <div>{"cb":{"kind":"Function","result":11},"shouldInvokeFns":true}</div>
+ * Forget:
+ *   (kind: ok)
+ *   <div>{"cb":{"kind":"Function","result":10},"shouldInvokeFns":true}</div>
+ *   <div>{"cb":{"kind":"Function","result":10},"shouldInvokeFns":true}</div>
+ */
+function useFoo({a, b}: {a: number, b: number}) {
+  const x = [];
+  const y = {value: a};
+
+  arrayPush(x, y); // x and y co-mutate
+  const y_alias = y;
+  const cb = () => y_alias.value;
+  setPropertyByKey(x[0], 'value', b); // might overwrite y.value
+  return <Stringify cb={cb} shouldInvokeFns={true} />;
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: useFoo,
+  params: [{a: 2, b: 10}],
+  sequentialRenders: [
+    {a: 2, b: 10},
+    {a: 2, b: 11},
+  ],
+};

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-aliased-capture-mutate.expect.md

@@ -0,0 +1,87 @@
+
+## Input
+
+```javascript
+// @flow @enableTransitivelyFreezeFunctionExpressions:false
+import {setPropertyByKey, Stringify} from 'shared-runtime';
+
+/**
+ * Variation of bug in `bug-aliased-capture-aliased-mutate`
+ * Found differences in evaluator results
+ * Non-forget (expected):
+ *   (kind: ok)
+ *   <div>{"cb":{"kind":"Function","result":2},"shouldInvokeFns":true}</div>
+ *   <div>{"cb":{"kind":"Function","result":3},"shouldInvokeFns":true}</div>
+ * Forget:
+ *   (kind: ok)
+ *   <div>{"cb":{"kind":"Function","result":2},"shouldInvokeFns":true}</div>
+ *   <div>{"cb":{"kind":"Function","result":2},"shouldInvokeFns":true}</div>
+ */
+
+function useFoo({a}: {a: number, b: number}) {
+  const arr = [];
+  const obj = {value: a};
+
+  setPropertyByKey(obj, 'arr', arr);
+  const obj_alias = obj;
+  const cb = () => obj_alias.arr.length;
+  for (let i = 0; i < a; i++) {
+    arr.push(i);
+  }
+  return <Stringify cb={cb} shouldInvokeFns={true} />;
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: useFoo,
+  params: [{a: 2}],
+  sequentialRenders: [{a: 2}, {a: 3}],
+};
+
+```
+
+## Code
+
+```javascript
+import { c as _c } from "react/compiler-runtime";
+import { setPropertyByKey, Stringify } from "shared-runtime";
+
+function useFoo(t0) {
+  const $ = _c(4);
+  const { a } = t0;
+  let t1;
+  if ($[0] !== a) {
+    const arr = [];
+    const obj = { value: a };
+
+    setPropertyByKey(obj, "arr", arr);
+    const obj_alias = obj;
+    let t2;
+    if ($[2] !== obj_alias.arr.length) {
+      t2 = () => obj_alias.arr.length;
+      $[2] = obj_alias.arr.length;
+      $[3] = t2;
+    } else {
+      t2 = $[3];
+    }
+    const cb = t2;
+    for (let i = 0; i < a; i++) {
+      arr.push(i);
+    }
+
+    t1 = <Stringify cb={cb} shouldInvokeFns={true} />;
+    $[0] = a;
+    $[1] = t1;
+  } else {
+    t1 = $[1];
+  }
+  return t1;
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: useFoo,
+  params: [{ a: 2 }],
+  sequentialRenders: [{ a: 2 }, { a: 3 }],
+};
+
+```
+      

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-aliased-capture-mutate.js

@@ -0,0 +1,34 @@
+// @flow @enableTransitivelyFreezeFunctionExpressions:false
+import {setPropertyByKey, Stringify} from 'shared-runtime';
+
+/**
+ * Variation of bug in `bug-aliased-capture-aliased-mutate`
+ * Found differences in evaluator results
+ * Non-forget (expected):
+ *   (kind: ok)
+ *   <div>{"cb":{"kind":"Function","result":2},"shouldInvokeFns":true}</div>
+ *   <div>{"cb":{"kind":"Function","result":3},"shouldInvokeFns":true}</div>
+ * Forget:
+ *   (kind: ok)
+ *   <div>{"cb":{"kind":"Function","result":2},"shouldInvokeFns":true}</div>
+ *   <div>{"cb":{"kind":"Function","result":2},"shouldInvokeFns":true}</div>
+ */
+
+function useFoo({a}: {a: number, b: number}) {
+  const arr = [];
+  const obj = {value: a};
+
+  setPropertyByKey(obj, 'arr', arr);
+  const obj_alias = obj;
+  const cb = () => obj_alias.arr.length;
+  for (let i = 0; i < a; i++) {
+    arr.push(i);
+  }
+  return <Stringify cb={cb} shouldInvokeFns={true} />;
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: useFoo,
+  params: [{a: 2}],
+  sequentialRenders: [{a: 2}, {a: 3}],
+};

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-functiondecl-hoisting.expect.md

@@ -0,0 +1,81 @@
+
+## Input
+
+```javascript
+import {Stringify} from 'shared-runtime';
+
+/**
+ * Fixture currently fails with
+ * Found differences in evaluator results
+ *   Non-forget (expected):
+ *   (kind: ok) <div>{"result":{"value":2},"fn":{"kind":"Function","result":{"value":2}},"shouldInvokeFns":true}</div>
+ *   Forget:
+ *   (kind: exception) bar is not a function
+ */
+function Foo({value}) {
+  const result = bar();
+  function bar() {
+    return {value};
+  }
+  return <Stringify result={result} fn={bar} shouldInvokeFns={true} />;
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: Foo,
+  params: [{value: 2}],
+};
+
+```
+
+## Code
+
+```javascript
+import { c as _c } from "react/compiler-runtime";
+import { Stringify } from "shared-runtime";
+
+/**
+ * Fixture currently fails with
+ * Found differences in evaluator results
+ *   Non-forget (expected):
+ *   (kind: ok) <div>{"result":{"value":2},"fn":{"kind":"Function","result":{"value":2}},"shouldInvokeFns":true}</div>
+ *   Forget:
+ *   (kind: exception) bar is not a function
+ */
+function Foo(t0) {
+  const $ = _c(6);
+  const { value } = t0;
+  let bar;
+  let result;
+  if ($[0] !== value) {
+    result = bar();
+    bar = function bar() {
+      return { value };
+    };
+    $[0] = value;
+    $[1] = bar;
+    $[2] = result;
+  } else {
+    bar = $[1];
+    result = $[2];
+  }
+
+  const t1 = bar;
+  let t2;
+  if ($[3] !== result || $[4] !== t1) {
+    t2 = <Stringify result={result} fn={t1} shouldInvokeFns={true} />;
+    $[3] = result;
+    $[4] = t1;
+    $[5] = t2;
+  } else {
+    t2 = $[5];
+  }
+  return t2;
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: Foo,
+  params: [{ value: 2 }],
+};
+
+```
+      

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-functiondecl-hoisting.tsx

@@ -0,0 +1,22 @@
+import {Stringify} from 'shared-runtime';
+
+/**
+ * Fixture currently fails with
+ * Found differences in evaluator results
+ *   Non-forget (expected):
+ *   (kind: ok) <div>{"result":{"value":2},"fn":{"kind":"Function","result":{"value":2}},"shouldInvokeFns":true}</div>
+ *   Forget:
+ *   (kind: exception) bar is not a function
+ */
+function Foo({value}) {
+  const result = bar();
+  function bar() {
+    return {value};
+  }
+  return <Stringify result={result} fn={bar} shouldInvokeFns={true} />;
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: Foo,
+  params: [{value: 2}],
+};

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-invalid-hoisting-functionexpr.expect.md

@@ -58,7 +58,7 @@ function Component(t0) {
   const $ = _c(5);
   const { obj, isObjNull } = t0;
   let t1;
-  if ($[0] !== isObjNull || $[1] !== obj.prop) {
+  if ($[0] !== isObjNull || $[1] !== obj) {
     t1 = () => {
       if (!isObjNull) {
         return obj.prop;
@@ -67,7 +67,7 @@ function Component(t0) {
       }
     };
     $[0] = isObjNull;
-    $[1] = obj.prop;
+    $[1] = obj;
     $[2] = t1;
   } else {
     t1 = $[2];

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-invalid-phi-as-dependency.expect.md

@@ -70,10 +70,10 @@ function Component() {
     throw new Error("invariant broken");
   }
   let t1;
-  if ($[1] !== obj || $[2] !== boxedInner) {
+  if ($[1] !== boxedInner || $[2] !== obj) {
     t1 = <Stringify obj={obj} inner={boxedInner} />;
-    $[1] = obj;
-    $[2] = boxedInner;
+    $[1] = boxedInner;
+    $[2] = obj;
     $[3] = t1;
   } else {
     t1 = $[3];

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-nonreactive-ref.expect.md

@@ -0,0 +1,89 @@
+
+## Input
+
+```javascript
+import {useRef} from 'react';
+import {Stringify} from 'shared-runtime';
+
+/**
+ * Bug: we're currently filtering out `ref.current` dependencies in
+ * `propagateScopeDependencies:checkValidDependency`. This is incorrect.
+ * Instead, we should always take a dependency on ref values (the outer box) as
+ * they may be reactive. Pruning should be done in
+ * `pruneNonReactiveDependencies`
+ *
+ * Found differences in evaluator results
+ * Non-forget (expected):
+ *   (kind: ok)
+ *   <div>{"cb":{"kind":"Function","result":1},"shouldInvokeFns":true}</div>
+ *   <div>{"cb":{"kind":"Function","result":2},"shouldInvokeFns":true}</div>
+ * Forget:
+ *   (kind: ok)
+ *   <div>{"cb":{"kind":"Function","result":1},"shouldInvokeFns":true}</div>
+ *   <div>{"cb":{"kind":"Function","result":1},"shouldInvokeFns":true}</div>
+ */
+function Component({cond}) {
+  const ref1 = useRef(1);
+  const ref2 = useRef(2);
+  const ref = cond ? ref1 : ref2;
+  const cb = () => ref.current;
+  return <Stringify cb={cb} shouldInvokeFns={true} />;
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: Component,
+  params: [{cond: true}],
+  sequentialRenders: [{cond: true}, {cond: false}],
+};
+
+```
+
+## Code
+
+```javascript
+import { c as _c } from "react/compiler-runtime";
+import { useRef } from "react";
+import { Stringify } from "shared-runtime";
+
+/**
+ * Bug: we're currently filtering out `ref.current` dependencies in
+ * `propagateScopeDependencies:checkValidDependency`. This is incorrect.
+ * Instead, we should always take a dependency on ref values (the outer box) as
+ * they may be reactive. Pruning should be done in
+ * `pruneNonReactiveDependencies`
+ *
+ * Found differences in evaluator results
+ * Non-forget (expected):
+ *   (kind: ok)
+ *   <div>{"cb":{"kind":"Function","result":1},"shouldInvokeFns":true}</div>
+ *   <div>{"cb":{"kind":"Function","result":2},"shouldInvokeFns":true}</div>
+ * Forget:
+ *   (kind: ok)
+ *   <div>{"cb":{"kind":"Function","result":1},"shouldInvokeFns":true}</div>
+ *   <div>{"cb":{"kind":"Function","result":1},"shouldInvokeFns":true}</div>
+ */
+function Component(t0) {
+  const $ = _c(1);
+  const { cond } = t0;
+  const ref1 = useRef(1);
+  const ref2 = useRef(2);
+  const ref = cond ? ref1 : ref2;
+  let t1;
+  if ($[0] === Symbol.for("react.memo_cache_sentinel")) {
+    const cb = () => ref.current;
+    t1 = <Stringify cb={cb} shouldInvokeFns={true} />;
+    $[0] = t1;
+  } else {
+    t1 = $[0];
+  }
+  return t1;
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: Component,
+  params: [{ cond: true }],
+  sequentialRenders: [{ cond: true }, { cond: false }],
+};
+
+```
+      

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-nonreactive-ref.tsx

@@ -0,0 +1,33 @@
+import {useRef} from 'react';
+import {Stringify} from 'shared-runtime';
+
+/**
+ * Bug: we're currently filtering out `ref.current` dependencies in
+ * `propagateScopeDependencies:checkValidDependency`. This is incorrect.
+ * Instead, we should always take a dependency on ref values (the outer box) as
+ * they may be reactive. Pruning should be done in
+ * `pruneNonReactiveDependencies`
+ *
+ * Found differences in evaluator results
+ * Non-forget (expected):
+ *   (kind: ok)
+ *   <div>{"cb":{"kind":"Function","result":1},"shouldInvokeFns":true}</div>
+ *   <div>{"cb":{"kind":"Function","result":2},"shouldInvokeFns":true}</div>
+ * Forget:
+ *   (kind: ok)
+ *   <div>{"cb":{"kind":"Function","result":1},"shouldInvokeFns":true}</div>
+ *   <div>{"cb":{"kind":"Function","result":1},"shouldInvokeFns":true}</div>
+ */
+function Component({cond}) {
+  const ref1 = useRef(1);
+  const ref2 = useRef(2);
+  const ref = cond ? ref1 : ref2;
+  const cb = () => ref.current;
+  return <Stringify cb={cb} shouldInvokeFns={true} />;
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: Component,
+  params: [{cond: true}],
+  sequentialRenders: [{cond: true}, {cond: false}],
+};

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-object-expression-computed-key-modified-during-after-construction-hoisted-sequence-expr.expect.md

@@ -0,0 +1,109 @@
+
+## Input
+
+```javascript
+import {identity, mutate} from 'shared-runtime';
+
+/**
+ * Bug: copy of error.todo-object-expression-computed-key-modified-during-after-construction-sequence-expr
+ * with the mutation hoisted to a named variable instead of being directly
+ * inlined into the Object key.
+ *
+ * Found differences in evaluator results
+ *   Non-forget (expected):
+ *   (kind: ok) [{"[object Object]":[42]},{"wat0":"joe","wat1":"joe"}]
+ *   [{"[object Object]":[42]},{"wat0":"joe","wat1":"joe"}]
+ *   Forget:
+ *   (kind: ok) [{"[object Object]":[42]},{"wat0":"joe","wat1":"joe"}]
+ *   [{"[object Object]":[42]},{"wat0":"joe","wat1":"joe","wat2":"joe"}]
+ */
+function Component(props) {
+  const key = {};
+  const tmp = (mutate(key), key);
+  const context = {
+    // Here, `tmp` is frozen (as it's inferred to be a primitive/string)
+    [tmp]: identity([props.value]),
+  };
+  mutate(key);
+  return [context, key];
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: Component,
+  params: [{value: 42}],
+  sequentialRenders: [{value: 42}, {value: 42}],
+};
+
+```
+
+## Code
+
+```javascript
+import { c as _c } from "react/compiler-runtime";
+import { identity, mutate } from "shared-runtime";
+
+/**
+ * Bug: copy of error.todo-object-expression-computed-key-modified-during-after-construction-sequence-expr
+ * with the mutation hoisted to a named variable instead of being directly
+ * inlined into the Object key.
+ *
+ * Found differences in evaluator results
+ *   Non-forget (expected):
+ *   (kind: ok) [{"[object Object]":[42]},{"wat0":"joe","wat1":"joe"}]
+ *   [{"[object Object]":[42]},{"wat0":"joe","wat1":"joe"}]
+ *   Forget:
+ *   (kind: ok) [{"[object Object]":[42]},{"wat0":"joe","wat1":"joe"}]
+ *   [{"[object Object]":[42]},{"wat0":"joe","wat1":"joe","wat2":"joe"}]
+ */
+function Component(props) {
+  const $ = _c(8);
+  let key;
+  let t0;
+  if ($[0] === Symbol.for("react.memo_cache_sentinel")) {
+    key = {};
+    t0 = (mutate(key), key);
+    $[0] = key;
+    $[1] = t0;
+  } else {
+    key = $[0];
+    t0 = $[1];
+  }
+  const tmp = t0;
+  let t1;
+  if ($[2] !== props.value) {
+    t1 = identity([props.value]);
+    $[2] = props.value;
+    $[3] = t1;
+  } else {
+    t1 = $[3];
+  }
+  let t2;
+  if ($[4] !== t1) {
+    t2 = { [tmp]: t1 };
+    $[4] = t1;
+    $[5] = t2;
+  } else {
+    t2 = $[5];
+  }
+  const context = t2;
+
+  mutate(key);
+  let t3;
+  if ($[6] !== context) {
+    t3 = [context, key];
+    $[6] = context;
+    $[7] = t3;
+  } else {
+    t3 = $[7];
+  }
+  return t3;
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: Component,
+  params: [{ value: 42 }],
+  sequentialRenders: [{ value: 42 }, { value: 42 }],
+};
+
+```
+      

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-object-expression-computed-key-modified-during-after-construction-hoisted-sequence-expr.js

@@ -0,0 +1,31 @@
+import {identity, mutate} from 'shared-runtime';
+
+/**
+ * Bug: copy of error.todo-object-expression-computed-key-modified-during-after-construction-sequence-expr
+ * with the mutation hoisted to a named variable instead of being directly
+ * inlined into the Object key.
+ *
+ * Found differences in evaluator results
+ *   Non-forget (expected):
+ *   (kind: ok) [{"[object Object]":[42]},{"wat0":"joe","wat1":"joe"}]
+ *   [{"[object Object]":[42]},{"wat0":"joe","wat1":"joe"}]
+ *   Forget:
+ *   (kind: ok) [{"[object Object]":[42]},{"wat0":"joe","wat1":"joe"}]
+ *   [{"[object Object]":[42]},{"wat0":"joe","wat1":"joe","wat2":"joe"}]
+ */
+function Component(props) {
+  const key = {};
+  const tmp = (mutate(key), key);
+  const context = {
+    // Here, `tmp` is frozen (as it's inferred to be a primitive/string)
+    [tmp]: identity([props.value]),
+  };
+  mutate(key);
+  return [context, key];
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: Component,
+  params: [{value: 42}],
+  sequentialRenders: [{value: 42}, {value: 42}],
+};

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-try-catch-maybe-null-dependency.expect.md

@@ -38,16 +38,24 @@ import { identity } from "shared-runtime";
  * try-catch block, as that might throw
  */
 function useFoo(maybeNullObject) {
-  const $ = _c(2);
+  const $ = _c(4);
   let y;
-  if ($[0] !== maybeNullObject.value.inner) {
+  if ($[0] !== maybeNullObject) {
     y = [];
     try {
-      y.push(identity(maybeNullObject.value.inner));
+      let t0;
+      if ($[2] !== maybeNullObject.value.inner) {
+        t0 = identity(maybeNullObject.value.inner);
+        $[2] = maybeNullObject.value.inner;
+        $[3] = t0;
+      } else {
+        t0 = $[3];
+      }
+      y.push(t0);
     } catch {
       y.push("null");
     }
-    $[0] = maybeNullObject.value.inner;
+    $[0] = maybeNullObject;
     $[1] = y;
   } else {
     y = $[1];

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/capturing-fun-alias-captured-mutate-2-iife.expect.md

@@ -32,7 +32,7 @@ import { mutate } from "shared-runtime";
 function component(foo, bar) {
   const $ = _c(3);
   let x;
-  if ($[0] !== foo || $[1] !== bar) {
+  if ($[0] !== bar || $[1] !== foo) {
     x = { foo };
     const y = { bar };
 
@@ -41,8 +41,8 @@ function component(foo, bar) {
     a.x = b;
 
     mutate(y);
-    $[0] = foo;
-    $[1] = bar;
+    $[0] = bar;
+    $[1] = foo;
     $[2] = x;
   } else {
     x = $[2];

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/capturing-fun-alias-captured-mutate-2.expect.md

@@ -24,7 +24,7 @@ import { c as _c } from "react/compiler-runtime";
 function component(foo, bar) {
   const $ = _c(3);
   let x;
-  if ($[0] !== foo || $[1] !== bar) {
+  if ($[0] !== bar || $[1] !== foo) {
     x = { foo };
     const y = { bar };
     const f0 = function () {
@@ -35,8 +35,8 @@ function component(foo, bar) {
 
     f0();
     mutate(y);
-    $[0] = foo;
-    $[1] = bar;
+    $[0] = bar;
+    $[1] = foo;
     $[2] = x;
   } else {
     x = $[2];

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/capturing-fun-alias-captured-mutate-arr-2-iife.expect.md

@@ -32,7 +32,7 @@ const { mutate } = require("shared-runtime");
 function component(foo, bar) {
   const $ = _c(3);
   let x;
-  if ($[0] !== foo || $[1] !== bar) {
+  if ($[0] !== bar || $[1] !== foo) {
     x = { foo };
     const y = { bar };
 
@@ -41,8 +41,8 @@ function component(foo, bar) {
     a.x = b;
 
     mutate(y);
-    $[0] = foo;
-    $[1] = bar;
+    $[0] = bar;
+    $[1] = foo;
     $[2] = x;
   } else {
     x = $[2];

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/capturing-fun-alias-captured-mutate-arr-2.expect.md

@@ -24,7 +24,7 @@ import { c as _c } from "react/compiler-runtime";
 function component(foo, bar) {
   const $ = _c(3);
   let x;
-  if ($[0] !== foo || $[1] !== bar) {
+  if ($[0] !== bar || $[1] !== foo) {
     x = { foo };
     const y = { bar };
     const f0 = function () {
@@ -35,8 +35,8 @@ function component(foo, bar) {
 
     f0();
     mutate(y);
-    $[0] = foo;
-    $[1] = bar;
+    $[0] = bar;
+    $[1] = foo;
     $[2] = x;
   } else {
     x = $[2];

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/capturing-func-alias-captured-mutate-arr-iife.expect.md

@@ -32,7 +32,7 @@ const { mutate } = require("shared-runtime");
 function component(foo, bar) {
   const $ = _c(3);
   let y;
-  if ($[0] !== foo || $[1] !== bar) {
+  if ($[0] !== bar || $[1] !== foo) {
     const x = { foo };
     y = { bar };
 
@@ -41,8 +41,8 @@ function component(foo, bar) {
     a.x = b;
 
     mutate(y);
-    $[0] = foo;
-    $[1] = bar;
+    $[0] = bar;
+    $[1] = foo;
     $[2] = y;
   } else {
     y = $[2];

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/capturing-func-alias-captured-mutate-arr.expect.md

@@ -24,7 +24,7 @@ import { c as _c } from "react/compiler-runtime";
 function component(foo, bar) {
   const $ = _c(3);
   let y;
-  if ($[0] !== foo || $[1] !== bar) {
+  if ($[0] !== bar || $[1] !== foo) {
     const x = { foo };
     y = { bar };
     const f0 = function () {
@@ -35,8 +35,8 @@ function component(foo, bar) {
 
     f0();
     mutate(y);
-    $[0] = foo;
-    $[1] = bar;
+    $[0] = bar;
+    $[1] = foo;
     $[2] = y;
   } else {
     y = $[2];

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/capturing-func-alias-captured-mutate-iife.expect.md

@@ -32,7 +32,7 @@ const { mutate } = require("shared-runtime");
 function component(foo, bar) {
   const $ = _c(3);
   let y;
-  if ($[0] !== foo || $[1] !== bar) {
+  if ($[0] !== bar || $[1] !== foo) {
     const x = { foo };
     y = { bar };
 
@@ -41,8 +41,8 @@ function component(foo, bar) {
     a.x = b;
 
     mutate(y);
-    $[0] = foo;
-    $[1] = bar;
+    $[0] = bar;
+    $[1] = foo;
     $[2] = y;
   } else {
     y = $[2];

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/capturing-func-alias-captured-mutate.expect.md

@@ -24,7 +24,7 @@ import { c as _c } from "react/compiler-runtime";
 function component(foo, bar) {
   const $ = _c(3);
   let y;
-  if ($[0] !== foo || $[1] !== bar) {
+  if ($[0] !== bar || $[1] !== foo) {
     const x = { foo };
     y = { bar };
     const f0 = function () {
@@ -35,8 +35,8 @@ function component(foo, bar) {
 
     f0();
     mutate(y);
-    $[0] = foo;
-    $[1] = bar;
+    $[0] = bar;
+    $[1] = foo;
     $[2] = y;
   } else {
     y = $[2];

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/capturing-func-mutate-2.expect.md

@@ -37,7 +37,7 @@ function component(a, b) {
   }
   const y = t0;
   let z;
-  if ($[2] !== a || $[3] !== y.b) {
+  if ($[2] !== a || $[3] !== y) {
     z = { a };
     const x = function () {
       z.a = 2;
@@ -45,7 +45,7 @@ function component(a, b) {
 
     x();
     $[2] = a;
-    $[3] = y.b;
+    $[3] = y;
     $[4] = z;
   } else {
     z = $[4];

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/capturing-function-member-expr-call.expect.md

@@ -46,10 +46,10 @@ function component(t0) {
   }
   const hide = t2;
   let t3;
-  if ($[4] !== poke || $[5] !== hide) {
+  if ($[4] !== hide || $[5] !== poke) {
     t3 = <Foo poke={poke} hide={hide} />;
-    $[4] = poke;
-    $[5] = hide;
+    $[4] = hide;
+    $[5] = poke;
     $[6] = t3;
   } else {
     t3 = $[6];

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/codegen-emit-imports-same-source.expect.md

@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @enableEmitFreeze @instrumentForget
+// @enableEmitFreeze @enableEmitInstrumentForget
 
 function useFoo(props) {
   return foo(props.x);
@@ -18,7 +18,7 @@ import {
   shouldInstrument,
   makeReadOnly,
 } from "react-compiler-runtime";
-import { c as _c } from "react/compiler-runtime"; // @enableEmitFreeze @instrumentForget
+import { c as _c } from "react/compiler-runtime"; // @enableEmitFreeze @enableEmitInstrumentForget
 
 function useFoo(props) {
   if (__DEV__ && shouldInstrument)

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/codegen-emit-imports-same-source.js

@@ -1,4 +1,4 @@
-// @enableEmitFreeze @instrumentForget
+// @enableEmitFreeze @enableEmitInstrumentForget
 
 function useFoo(props) {
   return foo(props.x);

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/codegen-instrument-forget-gating-test.expect.md

@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @instrumentForget @compilationMode(annotation) @gating
+// @enableEmitInstrumentForget @compilationMode(annotation) @gating
 
 function Bar(props) {
   'use forget';
@@ -25,7 +25,7 @@ function Foo(props) {
 ```javascript
 import { isForgetEnabled_Fixtures } from "ReactForgetFeatureFlag";
 import { useRenderCounter, shouldInstrument } from "react-compiler-runtime";
-import { c as _c } from "react/compiler-runtime"; // @instrumentForget @compilationMode(annotation) @gating
+import { c as _c } from "react/compiler-runtime"; // @enableEmitInstrumentForget @compilationMode(annotation) @gating
 const Bar = isForgetEnabled_Fixtures()
   ? function Bar(props) {
       "use forget";

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/codegen-instrument-forget-gating-test.js

@@ -1,4 +1,4 @@
-// @instrumentForget @compilationMode(annotation) @gating
+// @enableEmitInstrumentForget @compilationMode(annotation) @gating
 
 function Bar(props) {
   'use forget';

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/codegen-instrument-forget-test.expect.md

@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @instrumentForget @compilationMode(annotation)
+// @enableEmitInstrumentForget @compilationMode(annotation)
 
 function Bar(props) {
   'use forget';
@@ -24,7 +24,7 @@ function Foo(props) {
 
 ```javascript
 import { useRenderCounter, shouldInstrument } from "react-compiler-runtime";
-import { c as _c } from "react/compiler-runtime"; // @instrumentForget @compilationMode(annotation)
+import { c as _c } from "react/compiler-runtime"; // @enableEmitInstrumentForget @compilationMode(annotation)
 
 function Bar(props) {
   "use forget";

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/codegen-instrument-forget-test.js

@@ -1,4 +1,4 @@
-// @instrumentForget @compilationMode(annotation)
+// @enableEmitInstrumentForget @compilationMode(annotation)
 
 function Bar(props) {
   'use forget';

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/component.expect.md

@@ -46,7 +46,7 @@ function Component(props) {
   const items = props.items;
   const maxItems = props.maxItems;
   let renderedItems;
-  if ($[0] !== maxItems || $[1] !== items) {
+  if ($[0] !== items || $[1] !== maxItems) {
     renderedItems = [];
     const seen = new Set();
     const max = Math.max(0, maxItems);
@@ -62,8 +62,8 @@ function Component(props) {
         break;
       }
     }
-    $[0] = maxItems;
-    $[1] = items;
+    $[0] = items;
+    $[1] = maxItems;
     $[2] = renderedItems;
   } else {
     renderedItems = $[2];
@@ -79,15 +79,15 @@ function Component(props) {
     t0 = $[4];
   }
   let t1;
-  if ($[5] !== t0 || $[6] !== renderedItems) {
+  if ($[5] !== renderedItems || $[6] !== t0) {
     t1 = (
       <div>
         {t0}
         {renderedItems}
       </div>
     );
-    $[5] = t0;
-    $[6] = renderedItems;
+    $[5] = renderedItems;
+    $[6] = t0;
     $[7] = t1;
   } else {
     t1 = $[7];