Set up experimental builds (#17071)

* Don't bother including `unstable_` in error

The method names don't get stripped out of the production bundles
because they are passed as arguments to the error decoder.

Let's just always use the unprefixed APIs in the messages.

* Set up experimental builds

The experimental builds are packaged exactly like builds in the stable
release channel: same file structure, entry points, and npm package
names. The goal is to match what will eventually be released in stable
as closely as possible, but with additional features turned on.

Versioning and Releasing
------------------------

The experimental builds will be published to the same registry and
package names as the stable ones. However, they will be versioned using
a separate scheme. Instead of semver versions, experimental releases
will receive arbitrary version strings based on their content hashes.
The motivation is to thwart attempts to use a version range to match
against future experimental releases. The only way to install or depend
on an experimental release is to refer to the specific version number.

Building
--------

I did not use the existing feature flag infra to configure the
experimental builds. The reason is because feature flags are designed
to configure a single package. They're not designed to generate multiple
forks of the same package; for each set of feature flags, you must
create a separate package configuration.

Instead, I've added a new build dimension called the **release
channel**. By default, builds use the **stable** channel. There's
also an **experimental** release channel. We have the option to add more
in the future.

There are now two dimensions per artifact: build type (production,
development, or profiling), and release channel (stable or
experimental). These are separate dimensions because they are
combinatorial: there are stable and experimental production builds,
stable and experimental developmenet builds, and so on.

You can add something to an experimental build by gating on
`__EXPERIMENTAL__`, similar to how we use `__DEV__`. Anything inside
these branches will be excluded from the stable builds.
This gives us a low effort way to add experimental behavior in any
package without setting up feature flags or configuring a new package.

.circleci/config.yml

@@ -22,6 +22,32 @@ aliases:
   - &attach_workspace
     at: build
 
+  - &process_artifacts
+    docker: *docker
+    environment: *environment
+    steps:
+      - checkout
+      - attach_workspace: *attach_workspace
+      - *restore_yarn_cache
+      - *run_yarn
+      - run: node ./scripts/rollup/consolidateBundleSizes.js
+      - run: ./scripts/circleci/upload_build.sh
+      - run: ./scripts/circleci/pack_and_store_artifact.sh
+      - store_artifacts:
+          path: ./node_modules.tgz
+      - store_artifacts:
+          path: ./build.tgz
+      - store_artifacts:
+          path: ./build/bundle-sizes.json
+      - store_artifacts:
+          # TODO: Update release script to use local file instead of pulling
+          # from artifacts.
+          path: ./scripts/error-codes/codes.json
+      - persist_to_workspace:
+          root: build
+          paths:
+            - bundle-sizes.json
+
 jobs:
   setup:
     docker: *docker
@@ -74,6 +100,18 @@ jobs:
       - *run_yarn
       - run: yarn test --maxWorkers=2
 
+  test_source_experimental:
+    docker: *docker
+    environment: *environment
+    steps:
+      - checkout
+      - *restore_yarn_cache
+      - *run_yarn
+      - run:
+          environment:
+            RELEASE_CHANNEL: experimental
+          command: yarn test --maxWorkers=2
+
   test_source_persistent:
     docker: *docker
     environment: *environment
@@ -105,37 +143,60 @@ jobs:
       - run: ./scripts/circleci/add_build_info_json.sh
       - run: ./scripts/circleci/update_package_versions.sh
       - run: yarn build
+      - run: echo "stable" >> build/RELEASE_CHANNEL
+      - persist_to_workspace:
+          root: build
+          paths:
+            - RELEASE_CHANNEL
+            - facebook-www
+            - node_modules
+            - react-native
+            - dist
+            - sizes/*.json
+
+  build_experimental:
+    docker: *docker
+    environment: *environment
+    parallelism: 20
+    steps:
+      - checkout
+      - *restore_yarn_cache
+      - *run_yarn
+      - run:
+          environment:
+            RELEASE_CHANNEL: experimental
+          command: |
+            ./scripts/circleci/add_build_info_json.sh
+            ./scripts/circleci/update_package_versions.sh
+            yarn build
+      - run: echo "experimental" >> build/RELEASE_CHANNEL
       - persist_to_workspace:
           root: build
           paths:
+            - RELEASE_CHANNEL
             - facebook-www
             - node_modules
             - react-native
             - dist
             - sizes/*.json
 
-  process_artifacts:
+  # These jobs are named differently so we can distinguish the stable and
+  # and experimental artifacts
+  process_artifacts: *process_artifacts
+  process_artifacts_experimental: *process_artifacts
+
+  sizebot:
     docker: *docker
     environment: *environment
     steps:
       - checkout
       - attach_workspace: *attach_workspace
       - *restore_yarn_cache
       - *run_yarn
+      # This runs in the process_artifacts job, too, but it's faster to run
+      # this step in both jobs instead of running the jobs sequentially
       - run: node ./scripts/rollup/consolidateBundleSizes.js
       - run: node ./scripts/tasks/danger
-      - run: ./scripts/circleci/upload_build.sh
-      - run: ./scripts/circleci/pack_and_store_artifact.sh
-      - store_artifacts:
-          path: ./node_modules.tgz
-      - store_artifacts:
-          path: ./build.tgz
-      - store_artifacts:
-          path: ./build/bundle-sizes.json
-      - store_artifacts:
-          # TODO: Update release script to use local file instead of pulling
-          # from artifacts.
-          path: ./scripts/error-codes/codes.json
 
   lint_build:
     docker: *docker
@@ -208,7 +269,7 @@ jobs:
 
 workflows:
   version: 2
-  commit:
+  stable:
     jobs:
       - setup
       - lint:
@@ -232,6 +293,9 @@ workflows:
       - process_artifacts:
           requires:
             - build
+      - sizebot:
+          requires:
+            - build
       - lint_build:
           requires:
             - build
@@ -247,9 +311,24 @@ workflows:
       - test_dom_fixtures:
           requires:
             - build
-  hourly:
+
+  experimental:
+    jobs:
+      - setup
+      - test_source_experimental:
+          requires:
+            - setup
+      - build_experimental:
+          requires:
+            - setup
+      - process_artifacts_experimental:
+          requires:
+            - build_experimental
+
+  fuzz_tests:
     triggers:
       - schedule:
+          # Fuzz tests run hourly
           cron: "0 * * * *"
           filters:
             branches:

.eslintrc.js

@@ -149,6 +149,7 @@ module.exports = {
     spyOnProd: true,
     __PROFILE__: true,
     __UMD__: true,
+    __EXPERIMENTAL__: true,
     trustedTypes: true,
   },
 };

packages/react-dom/src/__tests__/ReactDOMRoot-test.js

@@ -103,9 +103,7 @@ describe('ReactDOMRoot', () => {
   it('throws a good message on invalid containers', () => {
     expect(() => {
       ReactDOM.unstable_createRoot(<div>Hi</div>);
-    }).toThrow(
-      'unstable_createRoot(...): Target container is not a DOM element.',
-    );
+    }).toThrow('createRoot(...): Target container is not a DOM element.');
   });
 
   it('warns when rendering with legacy API into createRoot() container', () => {
@@ -119,7 +117,7 @@ describe('ReactDOMRoot', () => {
       [
         // We care about this warning:
         'You are calling ReactDOM.render() on a container that was previously ' +
-          'passed to ReactDOM.unstable_createRoot(). This is not supported. ' +
+          'passed to ReactDOM.createRoot(). This is not supported. ' +
           'Did you mean to call root.render(element)?',
         // This is more of a symptom but restructuring the code to avoid it isn't worth it:
         'Replacing React-rendered children with a new root component.',
@@ -142,7 +140,7 @@ describe('ReactDOMRoot', () => {
       [
         // We care about this warning:
         'You are calling ReactDOM.hydrate() on a container that was previously ' +
-          'passed to ReactDOM.unstable_createRoot(). This is not supported. ' +
+          'passed to ReactDOM.createRoot(). This is not supported. ' +
           'Did you mean to call createRoot(container, {hydrate: true}).render(element)?',
         // This is more of a symptom but restructuring the code to avoid it isn't worth it:
         'Replacing React-rendered children with a new root component.',
@@ -163,7 +161,7 @@ describe('ReactDOMRoot', () => {
       [
         // We care about this warning:
         'You are calling ReactDOM.unmountComponentAtNode() on a container that was previously ' +
-          'passed to ReactDOM.unstable_createRoot(). This is not supported. Did you mean to call root.unmount()?',
+          'passed to ReactDOM.createRoot(). This is not supported. Did you mean to call root.unmount()?',
         // This is more of a symptom but restructuring the code to avoid it isn't worth it:
         "The node you're attempting to unmount was rendered by React and is not a top-level container.",
       ],
@@ -202,7 +200,7 @@ describe('ReactDOMRoot', () => {
     expect(() => {
       ReactDOM.unstable_createRoot(container);
     }).toWarnDev(
-      'You are calling ReactDOM.unstable_createRoot() on a container that was previously ' +
+      'You are calling ReactDOM.createRoot() on a container that was previously ' +
         'passed to ReactDOM.render(). This is not supported.',
       {withoutStack: true},
     );

packages/react-dom/src/client/ReactDOM.js

@@ -451,9 +451,8 @@ const ReactDOM: Object = {
       warningWithoutStack(
         !container._reactHasBeenPassedToCreateRootDEV,
         'You are calling ReactDOM.hydrate() on a container that was previously ' +
-          'passed to ReactDOM.%s(). This is not supported. ' +
+          'passed to ReactDOM.createRoot(). This is not supported. ' +
           'Did you mean to call createRoot(container, {hydrate: true}).render(element)?',
-        enableStableConcurrentModeAPIs ? 'createRoot' : 'unstable_createRoot',
       );
     }
     // TODO: throw or warn if we couldn't hydrate?
@@ -479,9 +478,8 @@ const ReactDOM: Object = {
       warningWithoutStack(
         !container._reactHasBeenPassedToCreateRootDEV,
         'You are calling ReactDOM.render() on a container that was previously ' +
-          'passed to ReactDOM.%s(). This is not supported. ' +
+          'passed to ReactDOM.createRoot(). This is not supported. ' +
           'Did you mean to call root.render(element)?',
-        enableStableConcurrentModeAPIs ? 'createRoot' : 'unstable_createRoot',
       );
     }
     return legacyRenderSubtreeIntoContainer(
@@ -526,8 +524,7 @@ const ReactDOM: Object = {
       warningWithoutStack(
         !container._reactHasBeenPassedToCreateRootDEV,
         'You are calling ReactDOM.unmountComponentAtNode() on a container that was previously ' +
-          'passed to ReactDOM.%s(). This is not supported. Did you mean to call root.unmount()?',
-        enableStableConcurrentModeAPIs ? 'createRoot' : 'unstable_createRoot',
+          'passed to ReactDOM.createRoot(). This is not supported. Did you mean to call root.unmount()?',
       );
     }
 
@@ -650,13 +647,9 @@ function createRoot(
   container: DOMContainer,
   options?: RootOptions,
 ): _ReactRoot {
-  const functionName = enableStableConcurrentModeAPIs
-    ? 'createRoot'
-    : 'unstable_createRoot';
   invariant(
     isValidContainer(container),
-    '%s(...): Target container is not a DOM element.',
-    functionName,
+    'createRoot(...): Target container is not a DOM element.',
   );
   warnIfReactDOMContainerInDEV(container);
   return new ReactRoot(container, options);
@@ -666,13 +659,9 @@ function createSyncRoot(
   container: DOMContainer,
   options?: RootOptions,
 ): _ReactRoot {
-  const functionName = enableStableConcurrentModeAPIs
-    ? 'createRoot'
-    : 'unstable_createRoot';
   invariant(
     isValidContainer(container),
-    '%s(...): Target container is not a DOM element.',
-    functionName,
+    'createRoot(...): Target container is not a DOM element.',
   );
   warnIfReactDOMContainerInDEV(container);
   return new ReactSyncRoot(container, BatchedRoot, options);
@@ -682,9 +671,8 @@ function warnIfReactDOMContainerInDEV(container) {
   if (__DEV__) {
     warningWithoutStack(
       !container._reactRootContainer,
-      'You are calling ReactDOM.%s() on a container that was previously ' +
+      'You are calling ReactDOM.createRoot() on a container that was previously ' +
         'passed to ReactDOM.render(). This is not supported.',
-      enableStableConcurrentModeAPIs ? 'createRoot' : 'unstable_createRoot',
     );
     container._reactHasBeenPassedToCreateRootDEV = true;
   }

packages/shared/ReactFeatureFlags.js

@@ -52,7 +52,7 @@ export const disableInputAttributeSyncing = false;
 
 // These APIs will no longer be "unstable" in the upcoming 16.7 release,
 // Control this behavior with a flag to support 16.6 minor releases in the meanwhile.
-export const enableStableConcurrentModeAPIs = false;
+export const enableStableConcurrentModeAPIs = __EXPERIMENTAL__;
 
 export const warnAboutShorthandPropertyCollision = false;
 

scripts/error-codes/codes.json

@@ -297,7 +297,7 @@
   "296": "Log of yielded values is not empty. Call expect(ReactTestRenderer).unstable_toHaveYielded(...) first.",
   "297": "The matcher `unstable_toHaveYielded` expects an instance of React Test Renderer.\n\nTry: expect(ReactTestRenderer).unstable_toHaveYielded(expectedYields)",
   "298": "Hooks can only be called inside the body of a function component.",
-  "299": "%s(...): Target container is not a DOM element.",
+  "299": "createRoot(...): Target container is not a DOM element.",
   "300": "Rendered fewer hooks than expected. This may be caused by an accidental early return statement.",
   "301": "Too many re-renders. React limits the number of renders to prevent an infinite loop.",
   "302": "It is not supported to run the profiling version of a renderer (for example, `react-dom/profiling`) without also replacing the `scheduler/tracing` module with `scheduler/tracing-profiling`. Your bundler might have a setting for aliasing both modules. Learn more at http://fb.me/react-profiling",

scripts/eslint-rules/__tests__/warning-and-invariant-args-test.internal.js

@@ -20,7 +20,7 @@ ruleTester.run('eslint-rules/warning-and-invariant-args', rule, {
     'arbitraryFunction(a, b)',
     // These messages are in the error code map
     "invariant(false, 'Do not override existing functions.')",
-    "invariant(false, '%s(...): Target container is not a DOM element.', str)",
+    "invariant(false, 'createRoot(...): Target container is not a DOM element.')",
   ],
   invalid: [
     {

scripts/flow/environment.js

@@ -11,6 +11,7 @@
 
 declare var __PROFILE__: boolean;
 declare var __UMD__: boolean;
+declare var __EXPERIMENTAL__: boolean;
 
 declare var __REACT_DEVTOOLS_GLOBAL_HOOK__: any; /*?{
   inject: ?((stuff: Object) => void)

scripts/jest/setupEnvironment.js

@@ -7,6 +7,7 @@ if (NODE_ENV !== 'development' && NODE_ENV !== 'production') {
 global.__DEV__ = NODE_ENV === 'development';
 global.__PROFILE__ = NODE_ENV === 'development';
 global.__UMD__ = false;
+global.__EXPERIMENTAL__ = process.env.RELEASE_CHANNEL === 'experimental';
 
 if (typeof window !== 'undefined') {
   global.requestIdleCallback = function(callback) {

scripts/release/utils.js

@@ -78,12 +78,16 @@ const getArtifactsList = async buildID => {
 const getBuildInfo = async () => {
   const cwd = join(__dirname, '..', '..');
 
+  const isExperimental = process.env.RELEASE_CHANNEL === 'experimental';
+
   const branch = await execRead('git branch | grep \\* | cut -d " " -f2', {
     cwd,
   });
   const commit = await execRead('git show -s --format=%h', {cwd});
   const checksum = await getChecksumForCurrentRevision(cwd);
-  const version = `0.0.0-${commit}`;
+  const version = isExperimental
+    ? `0.0.0-experimental-${commit}`
+    : `0.0.0-${commit}`;
 
   // Only available for Circle CI builds.
   // https://circleci.com/docs/2.0/env-vars/
@@ -94,7 +98,9 @@ const getBuildInfo = async () => {
   const packageJSON = await readJson(
     join(cwd, 'packages', 'react', 'package.json')
   );
-  const reactVersion = `${packageJSON.version}-canary-${commit}`;
+  const reactVersion = isExperimental
+    ? `${packageJSON.version}-experimental-canary-${commit}`
+    : `${packageJSON.version}-canary-${commit}`;
 
   return {branch, buildNumber, checksum, commit, reactVersion, version};
 };