Webpack 5

[andriijas]

This draft PR aims to integrate webpack 5 into create-react-app.
Integration is currently in early stages and not ready to for community testing yet as there are a couple of tasks to resolve before we have first successful builds. Thank you for your patience!

11/05/2019 Initial draft PR

Internal work

	Description	Commit
✔️	Make sure to use mode	(we do since webpack 4)
✔️	Upgrade webpack to webpack 5	1ae2d5d
✔️	Remove futureEmitAssets	7eabe2a
✔️	Update IgnorePlugin arg sig	86b2200
⚠️	Adjust webpack to automatic node polyfill removal (rebase #7914)	426e6ce
🚧	Upgrade all plugins and loaders to latest version
🚧	Make sure build has no errors or warnings
🚧	Remove deprecation warnings during build
🚧	Update outdated options
🚧	Cleanup configuration

External work

	Description	Link
🚧	mini-css-extract-plugin compatibility	webpack/mini-css-extract-plugin#458

[sebinsua]

@andriijas Are you still working on this?

I created my own branch and did a lot more work so if you want to cherry-pick from this into here or anywhere feel free.

I'm able to run most of the e2e tests from tasks/local-test.sh (simple, kitchensink, kitchesink-eject, installs).

The one test suite which isn't working very well is behavior:

1. Some of the plugins need to be updated. The snapshots contain messages which ModuleNotFoundPlugin and ModuleScopePlugin should produce and these aren't matching.
2. fixtures/builds-with-multiple-runtimes/index.test.js is failing. I'm not sure what this is even testing...
3. fixtures/typescript-typecheck/index.test.js is failing. This might be because fork-ts-checker-plugin hasn't been updated for Webpack 5 yet? It's currently not producing the error messages that are expected.
4. html-webpack-plugindoesn't yet support Webpack 5. (This causes yarn start to fail on first run and when watching changes.)

Something really weird was that I had to amend this rule in order to avoid a validation error. And, perhaps related to this, but the default json-loader didn't work for me so I had to add one manually. (Edit: For some reason, removing either/both causes errors during the kitchensink E2E suite.)

[ScriptedAlchemy]

As one of the core maintainers of webpack. I’ll also be reviewing the progress here and will try to step in to support. Im about to finish next.js upgrade to WP5

[ScriptedAlchemy]

Require ensure has changed. So to get the same feature set, you likely want to either tap it from the JavaScriptGenerator. - I do believe a requireEnsure hook still exists though.

[andriijas]

@sebinsua thanks for stepping in, I halted work on this by purpose - wanted webpack 5 to reach RC at least before continuing and for the obvious reason you mentioned, external plugins needs to be adressed with webpack 5 compability as well.

Im now thinking we should create a feature branch here to make smaller PRs to - would you be open to help out?

[piotr-oles]

Hi!
I'm the author of the fork-ts-checker-webpack-plugin. Just to let you know - I released an alpha version (v5.0.0-alpha.1) which supports Webpack 5 🚀

⚠️ Keep in mind that there are breaking changes regarding the configuration of the plugin - the configuration is documented in the README.md :)

[raix]

Is this pull-request stale?
webpack/webpack#11406 (comment)

[andriijas]

Is this pull-request stale?
webpack/webpack#11406 (comment)

Check comment here #9613 (comment)

[raix]

@andriijas To test things out I ejected on one or our applications and managed to do yarn build I used npx serve to QA the build. (yarn start also works now...)

I'm not sure if it's helpful eg. to plan out smaller pull-requests for updating plugins etc.

Some findings updating to webpack 5

Loaders / Plugins

postcss-loader

• Move config into "postcssOptions"
• (converted plugins to an array instead of a lambda, not sure if that's the best way)

terser-webpack-plugin

• no apparent changes was needed

ForkTsCheckerWebpackPlugin

newForkTsCheckerWebpackPlugin({async: isEnvDevelopment,// TODO: Add back resolvers for pnpTstypescript: {typescriptPath: resolve.sync('typescript',{basedir: paths.appNodeModules,}),context: paths.appPath,diagnosticOptions: {syntactic: true},mode: 'write-references'},logger: {infrastructure: "silent"},// The formatter is invoked directly in WebpackDevServerUtils during developmentformatter: isEnvProduction ? typescriptFormatter : undefined,})

TODO: Add back pnp support

optimize-css-assets-webpack-plugin (optional afaik)

• use css-minimizer-webpack-plugin instead of optimize-css-assets-webpack-plugin
  Ref: https://webpack.js.org/plugins/css-minimizer-webpack-plugin/
• remove postcss-safe-parser

In babel-preset-react-app

• Use onlyRemoveTypeImports for the @babel/preset-typescript
  Reference: https://github.com/TypeStrong/fork-ts-checker-webpack-plugin/blob/9639c2bbefec0c9475dae6693ca17ae4a5776992/examples/babel-loader/.babelrc.js
  This change is just an optimization sould not be relevant / needed in the future, maybe just leave it out

ManifestPlugin

• use 3.0.0-rc.0

webpack.IgnorePlugin

• Use named options resourceRegExp and contextRegExp

WorkboxWebpackPlugin.GenerateSW

• importWorkboxFrom deprecated (accordingly to the documentation no longer relevant, but would need to give it a reading)
• navigateFallbackBlacklist -> navigateFallbackDenylist

References:

• generateSW uses custom Workbox runtime bundles, not CDN GoogleChrome/workbox#2064
• Switch to allow/denylist GoogleChrome/workbox#2325
• webpack v5 compatibility GoogleChrome/workbox#2641

webpack 5 related:

In webpack.config.js:

Remove:

• futureEmitAssets
• jsonpFunction
• { parser: { requireEnsure: false } }
• node - this would be a breaking change?

Add this fix to the top

target: "browserslist",
// Fix babel resolve
// ref: https://github.com/webpack/webpack/issues/11467
{
// Note: This is not the real fix, babel will release a fix in the upcoming week
// Ref: https://github.com/babel/babel/issues/12058
test: /\.m?js/,
resolve: {
fullySpecified: false,
},
},

Fix filename in webpack.config.js

filename: isEnvProduction
? 'static/js/[name].[contenthash:8].js'
: isEnvDevelopment && 'static/js/[name].js',

previously it was isEnvDevelopment && 'static/js/bundle.js' but got "Conflict: Multiple assets emit to the same filename" - there might be an underlying issue - eg. a double compilation etc.

In formatWebpackMessages.js

• Remove chalk import
• Remove usage of chalk at lines[0] = chalk.inverse(lines[0]);
• Fix the format message input - not always a string

function formatMessage(messageObject) {
let message = messageObject.message || messageObject;

In ModuleNotFoundPlugin.js

• SingleEntryPlugin -> EntryPlugin

In ModuleScopePlugin.js

// request.descriptionFileRoot.indexOf('/node_modules/') !== -1 ||// request.descriptionFileRoot.indexOf('\\node_modules\\') !== -1 ||request.path.includes('/node_modules/')||request.path.includes('\\node_modules\\')||

Looking at the request object the request.relativePath on my mac == './Users/...' - '.' + absolute path, request.path is wrong as it will be /Users/.../Users/... - seems like a webpack or babel issue - but the check still works

react-scripts build

Using npx serve on the static build the app starts up

react-scripts start

I've only just started looking at WebPackDevServerUtils.js only change I've done is:
getCompilerHooks(compiler)receive -> issues
Reference: TypeStrong/fork-ts-checker-webpack-plugin#490

Disclaimer - I just ejected to test things out - currently only looking into getting it running - next would be to verify each change and its correctness

[andriijas]

@raix thx, ill might look into this during the week if i find some time :)

[ali-master]

Hi there,

This MR should be updated because the Webpack v5 has been released 3 days ago.

[kagawagao]

Compiler Stats updated in webpack 5, formatWebpackMessage should be updated

Stats json errors and warnings no longer contain strings but objects with information splitted into properties.
MIGRATION: Access the information on the properties. i. e. message

[andriijas]

@andriijas@sebinsua are either of you still working on this?

Not since last update but I would like to pick it up soon,

[ScriptedAlchemy]

Once error formatting is done. I'll help on any remaining issues.

I'm not not dealing with the formatted haha

[jasonwilliams]

Once error formatting is done. I'll help on any remaining issues.

I'm not not dealing with the formatted haha

@ScriptedAlchemy error formatting is easy, that snippet from @jimblue will solve it.
Maybe a new PR with all the changes from @sebinsua would be really helpful. I think we're close.

If you wanted to make that PR and leave errorFormatting i can even PR that in.

[ScriptedAlchemy]

Where the most current branch, or do we need one which aggregates two branch change sets together?

Just wrapping up storybooks webpack 5 upgrade, then can pull whatever branch is most current

[andriijas]

Where the most current branch, or do we need one which aggregates two branch change sets together?

Just wrapping up storybooks webpack 5 upgrade, then can pull whatever branch is most current

The fastest option is to create a new PR from scratch if you need to move quickly.

[ScriptedAlchemy]

I don't use CRA, so I'm just here to unstick any problems blocking the community on the nearest progressed branch. Will look around and see what's been proposed already

[raix]

@ScriptedAlchemy Let me know if you need help on making a pr - I do have a branch working locally with webpack 5 (when doing a manual QA), continued on the branch @sebinsua created on duplotech. (but it would be nice to break it up into smaller pieces or redo it)

That said a strategy could also be to make small pull-requests to master upgrading the different plugins.

• The ManifestPlugin plugin is slowly getting up to speed / maintained again (haven't seen a wp5 version yet)
• The Webpack dev server doesn't yet support federated modules so we'll likely have to wait abit on that.
• Not sure if CRA have swapped to use the ESLintPlugin instead of eslint-loader? (Edit: fixed in Replace deprecated eslint-loader by eslint-webpack-plugin #9751 )
• OptimizeCSSAssetsPlugin should likely swap to use css-minimizer-webpack-plugin instead.
• Webpack 5 dropped nodejs builtin package shims - not sure if we need to still support this. (packages like axios still need this afaik)
• I did also update postcss having some changes - not sure if needed.
• I didn't check the PnpWebpackPlugin if that works (we currently don't use PnP - and the tests on CRA are broken, not sure if the feature actually still works)
• IgnorePlugin and GenerateSW changed signature - minor change
• ForkTsCheckerWebpackPlugin update contains more changes also renaming the hook to issues (as I remember)
• And yes... fix the format webpack messages (did it in one line to get it working - on both WP4 and 5 - but would require more work)
• The webpack config it self has minor changes, a filename to be updated etc. (CRA would then be WP5 only?)
• And omg fix the test suite and setup policies on the pipeline to block pr's with failing tests...please (I have one pr to fix / improve part of the test suite - but there are more issues)

More findings in #7929 (comment)

(I have to move really fast so did actually build a CRA compatible build from scratch with federated module support written in TypeScript - but would prefer to use CRA if possible, I'm hoping to move back at some point - will help out if needed)

Kind regards Morten

[andriijas]

@raix Thanks for the compilation. I agree it would be beneficial to try to cut the upgrade to as small chunks as possible. Getting support for federated modules should be done separately as it's a new feature however it will be useful for large multi team companies who use CRA for microfrontend dev.

[jasonwilliams]

Agree with both small pull requests and doing module federation separately.

I wouldn’t focus on module federation right now as no one is waiting on that and can be done at a later date. We don’t want to add even more scope to this.

@raix can I suggest we move your list to an issue? Then we can keep the list as PRs get merged.

[raix]

@jasonwilliams@andriijas I've created an issue containing an initial overview of what needs to be tackled to get Webpack 5 in CRA - #9994 let me know what you think

[jasonwilliams]

Looks good to me, I reckon we can close this PR and move conversation there

[raix]

just a minor update:
We are down to creating 3 tiny pull-requests and have 6 pending pull-requests #9994
The final pull-request will be a fairly small change as it's only updating terser and webpack specific config changes.

[andriijas]

@raix ive seen it, i will help review and testing. Good work!

[raix]

@andriijas thank you! I'll keep the status updated and in general help to make progress

But if possible it might make sense to prioritize merging #10091 (and #10177) ? as it will fix part of the test suite - would be really helpful, I normally fix the test suite locally and run tests but it's a slow process
I also suggested to skip the rest of failing tests for now and only merge when tests are all green, maybe enforced by a policy if possible

[cristovaoth]

@ScriptedAlchemy Let me know if you need help on making a pr - I do have a branch working locally with webpack 5 (when doing a manual QA), continued on the branch @sebinsua created on duplotech. (but it would be nice to break it up into smaller pieces or redo it)

That said a strategy could also be to make small pull-requests to master upgrading the different plugins.

• The ManifestPlugin plugin is slowly getting up to speed / maintained again (haven't seen a wp5 version yet)
• The Webpack dev server doesn't yet support federated modules so we'll likely have to wait abit on that.
• Not sure if CRA have swapped to use the ESLintPlugin instead of eslint-loader? (Edit: fixed in Replace deprecated eslint-loader by eslint-webpack-plugin #9751 )
• OptimizeCSSAssetsPlugin should likely swap to use css-minimizer-webpack-plugin instead.
• Webpack 5 dropped nodejs builtin package shims - not sure if we need to still support this. (packages like axios still need this afaik)
• I did also update postcss having some changes - not sure if needed.
• I didn't check the PnpWebpackPlugin if that works (we currently don't use PnP - and the tests on CRA are broken, not sure if the feature actually still works)
• IgnorePlugin and GenerateSW changed signature - minor change
• ForkTsCheckerWebpackPlugin update contains more changes also renaming the hook to issues (as I remember)
• And yes... fix the format webpack messages (did it in one line to get it working - on both WP4 and 5 - but would require more work)
• The webpack config it self has minor changes, a filename to be updated etc. (CRA would then be WP5 only?)
• And omg fix the test suite and setup policies on the pipeline to block pr's with failing tests...please (I have one pr to fix / improve part of the test suite - but there are more issues)

More findings in #7929 (comment)

(I have to move really fast so did actually build a CRA compatible build from scratch with federated module support written in TypeScript - but would prefer to use CRA if possible, I'm hoping to move back at some point - will help out if needed)

Kind regards Morten

We are trying to achieve the same, i.e., eject latest cra, and upgrade to webpack@5. We followed all the steps you outlined above, and also under #9994, but currently not able to make it work.

Perhaps you could push the aforementioned local branch where you made this work @raix ? That would be super helpful

Kind regards

[raix]

@CristovaoHonorato I dont have that work locally anymore (I clean up stale work, was a POC, result of that week was custom wp/cli and the key points posted here) - the pull-requests open in the CRA project should bring remaining changes down to the webpack config (The branch @sebinsua created might also give clues to changes needed in the config)

[D4nte]

Is this included in 5.0.0-next.31?