Plug'n'Play support #5136

arcanis · 2018-09-27T14:54:18Z

Fixes #5117 - there's still at least one issue with ESLint which cannot load its plugins, and as a result crashes (eslint/eslint#10125), but at least it gets to this point 🙂

Timer · 2018-09-27T14:59:58Z

We probably need the Jest resolver too, right?

arcanis · 2018-09-27T15:05:37Z

Oh likely, yes - I tested yarn start & yarn build but not yarn test - let me check. I'll also split the process args forwarding in a separate PR, so that this one can stay open until everything works 👍

arcanis · 2018-09-27T15:23:17Z

Got it working with the plugin, just one interesting problem - Babel transforms the code to use the @babel/runtime package, which is nice and all. Problem is: @babel/runtime is not listed as dependency of the package containing the transformed code! So the resolution is ambiguous and fails 😐

If @babel/runtime was declared as dependency of the top-level, it would work without issue, because PnP fallbacks to the top-level for compatibility purposes. Unfortunately, in react-scripts's case, @babel/runtime isn't top-level, so it cannot be picked up by the fallback 😞

Apart from moving @babel/runtime to the top level, the only other possible fix I see would be for whatever transpile using @babel/runtime to use the full path (/tmp/cache/@babel-runtime-1.0.0/...) instead of the bare import (@babel/runtime/...). Will check if that can be done.

Timer · 2018-09-27T15:25:16Z

The full path option sounds great, especially because it's immediately bundled in other parts of the app.

arcanis · 2018-09-27T16:51:34Z

Pushed a commit that does exactly this (I'll move it in a separate PR later too so it can be merged independently) 👍

I also need to merge yarnpkg/yarn#6444 and yarnpkg/yarn#6443 on Yarn's side. Will then continue investigating to make sure everything's ok. Do you have suggestions to add tests? Can I just add a travis config that uses PnP to make the install?

Timer · 2018-09-27T16:57:58Z

We need to majorly overhaul our testing, but a travis config that uses PnP would be best for now.

…er PnP

arcanis · 2018-09-29T12:41:10Z

Here we go! All green 😃

Note that this PR only makes create-native-app compatible with PnP environments, but doesn't expose a way to toggle it on from the command line (apart from using yarn --pnp once the project has been created). Do you want me to open another PR for this?

gaearon · 2018-09-29T15:22:03Z

@arcanis Could you clarify what happens to ESLint in the meantime?

gaearon · 2018-09-29T15:22:46Z

Do you want me to open another PR for this?

You can add a --pnp flag to CRA in this PR. In fact I thought we already pass unknown flags to npm/Yarn. If we don't maybe we should just do that?

gaearon · 2018-09-29T15:23:07Z

packages/create-react-app/createReactApp.js

+
+      const nodeArgs = fs.existsSync(pnpPath) ? ['--require', pnpPath] : [];
+
+      await executeNodeScript(


Does this work on Node LTS version?

I think so, it doesn't use any recent feature and the Node 8 tests pass.

gaearon · 2018-09-29T15:23:52Z

packages/react-scripts/config/webpack.config.dev.js

      // Prevents users from importing files from outside of src/ (or node_modules/).
      // This often causes confusion because we only process files within src/ with babel.
      // To fix this, we prevent you from importing files out of src/ -- if you'd like to,
      // please link the files into your node_modules/ and let module-resolution kick in.
      // Make sure your source files are compiled, as they will not be processed in any way.
      new ModuleScopePlugin(paths.appSrc, [paths.appPackageJson]),
    ],
+    // Plug'n'Play relies on symlink for its virtual paths (ie peer dependencies), which Webpack
+    // always resolve to the absolute path on disk by default.
+    symlinks: false,


If we're not in PnP mode, would that create problems? It seems like potential breaking change, no?
I'm not sure how this impacts behavior but I wouldn't be surprised if it does.

Is this something we want to do anyway?

If we do this, symlinking src/ to node_modules/@ won't work because we'll treat app code as node_module code (instead of application code).
We could add special behavior to compile code from @ as app code, but I'd want to collect feedback on what people are using symlinks for currently -- I suspect it'll be in line with the behavior we want.

@Timer where is defined this @ symlink? Shouldn't it be an alias entry in webpack/jest?

We didn’t add this feature yet. We were hoping we could do it via symlink instead of adding a special alias to every tool. It would be nice to not confuse IDEs, Flow, etc, which symlink could help with.

arcanis · 2018-09-30T08:24:50Z

@arcanis Could you clarify what happens to ESLint in the meantime?

I added CRA/ESLint compatibility with yarnpkg/yarn#6449. It basically makes react-scripts a valid fallback for resolving dependencies. It's only a temporary measure since it removes some safety, but better than not working at all.

You can add a --pnp flag to CRA in this PR. In fact I thought we already pass unknown flags to npm/Yarn. If we don't maybe we should just do that?

Will check 👍

gaearon · 2018-09-30T12:59:51Z

symlinks: false worries me.

Can you describe effects of this change in detail, unrelated to PnP? I think this will probably break some existing use cases but I’m not sure they’re valid in the first place. I’m also not sure how this relates to Jest behavior (does Jest match behavior with this flag on or off?)

Also is this related to #3883?

gaearon · 2018-09-30T21:41:09Z

How can I test this?

arcanis · 2018-09-30T22:54:59Z

I found a way to avoid symlinks: false: I intercept SymlinkPlugin directly from within the PnP plugin, and inhibits its effects when under PnP environments. Since the plugin is a noop otherwise, it won't affect anything else.

As for testing I didn't test directly on create-react-app, but I got a case where symlinks: false was causing issues with ts-loader, the plugin upgrade fixed the issue. You can check a minimal repro here: https://github.com/arcanis/webpack-symlinks-test/blob/master/webpack.config.js.

gaearon · 2018-09-30T22:58:57Z

Ah that sounds fine, thanks. I meant — how can I test this PR? Do I need to build yarn from master?

arcanis · 2018-10-01T09:14:34Z

The nightly Yarn should be fine: https://nightly.yarnpkg.com/yarn-1.12.0-20180928.1315.js

To enable PnP when creating a new project, you can set the YARN_PLUGNPLAY_OVERRIDE=1 environment variable for the create-react-app process (it won't add the installConfig.pnp key in the package.json, but will still tell Yarn to install everything using PnP regardless of the settings).

gaearon · 2018-10-01T13:33:03Z

Do we know why AppVeyor build is timing out?

Timer · 2018-10-01T13:41:20Z

Do we know why AppVeyor build is timing out?

Appears to have started with 2a7346e, though it did not add any new tests for AppVeyor -- strictly Travis.

Maybe the verdaccio upgrade caused something?

gaearon · 2018-10-01T14:53:13Z

Thanks!

gaearon · 2018-10-01T21:27:27Z

packages/react-scripts/scripts/utils/createJestConfig.js

@@ -22,7 +22,8 @@ module.exports = (resolve, rootDir, isEjecting) => {
  // in Jest configs. We need help from somebody with Windows to determine this.
  const config = {
    collectCoverageFrom: ['src/**/*.{js,jsx}'],
-    setupFiles: ['react-app-polyfill/jsdom'],
+    resolver: require.resolve('jest-pnp-resolver'),
+    setupFiles: [require.resolve('react-app-polyfill/jsdom')],


This leaves an absolute path after ejecting.

* Adds the PnP plugin for Webpack to find dependencies when working under PnP * Adds configuration for jest * Adds an e2e test for when using PnP * Avoids cra from crashing at the engine check * Avoids cra from crashing when initializing react-scripts * Makes the ownPath portable * Fixes linting * Bumps to [email protected], removes symlinks: false * Adds a --use-pnp option * Pin version

facebook-github-bot added the CLA Signed label Sep 27, 2018

arcanis mentioned this pull request Sep 27, 2018

Yarn PnP Compatibility #5117

Closed

Timer added this to the 2.0.0 milestone Sep 27, 2018

arcanis force-pushed the pnp branch from 92bb0a5 to 539b600 Compare September 27, 2018 16:49

Timer mentioned this pull request Sep 27, 2018

Remove runtime alias hack #5142

Merged

Timer modified the milestones: 2.0.0, 2.x Sep 28, 2018

arcanis mentioned this pull request Sep 28, 2018

Fixes workbox dependencies GoogleChrome/workbox#1667

Merged

arcanis force-pushed the pnp branch from 539b600 to ff4d177 Compare September 28, 2018 15:06

arcanis mentioned this pull request Sep 28, 2018

Forwards args through thread-loader #5157

Merged

arcanis force-pushed the pnp branch from ff4d177 to 1d148e5 Compare September 28, 2018 15:35

Maël Nison added 2 commits September 28, 2018 17:36

Adds the PnP plugin for Webpack to find dependencies when working und…

f04f0dd

…er PnP

Adds configuration for jest

63152ef

arcanis force-pushed the pnp branch from 1d148e5 to 63152ef Compare September 28, 2018 15:39

Adds an e2e test for when using PnP

6eb3f33

arcanis force-pushed the pnp branch from f07537d to 6eb3f33 Compare September 28, 2018 16:58

Maël Nison added 4 commits September 29, 2018 01:05

Avoids cra from crashing at the engine check

7c362b0

Avoids cra from crashing when initializing react-scripts

eae3d82

Makes the ownPath portable

5bbe63a

Fixes linting

747ba0e

arcanis force-pushed the pnp branch from 7927a5f to 747ba0e Compare September 29, 2018 12:23

gaearon reviewed Sep 29, 2018

View reviewed changes

Bumps to [email protected], removes symlinks: false

3609e33

Adds a --use-pnp option

6862713

arcanis force-pushed the pnp branch from 64f59d1 to 6862713 Compare October 1, 2018 14:21

Pin version

543f5f8

gaearon merged commit 9e074bb into facebook:master Oct 1, 2018

gaearon modified the milestones: 2.x, 2.0 Oct 1, 2018

Timer added the tag: enhancement label Oct 1, 2018

gaearon reviewed Oct 1, 2018

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gaearon mentioned this pull request Oct 1, 2018

Fix absolute paths on eject #5214

Merged

msokk mentioned this pull request Nov 1, 2018

Absolute module imports through node_modules symlinks with Plug'n'Play yarnpkg/yarn#6616

Closed

edmorley mentioned this pull request Jan 4, 2019

Add support for Yarn's Plug n Play mode neutrinojs/neutrino#1277

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Plug'n'Play support #5136

Plug'n'Play support #5136

arcanis commented Sep 27, 2018

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gaearon Oct 1, 2018


		const nodeArgs = fs.existsSync(pnpPath) ? ['--require', pnpPath] : [];

		await executeNodeScript(

Plug'n'Play support #5136

Plug'n'Play support #5136

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