Use of deprecated webpack DevServer onBeforeSetupMiddleware and onAfterSetupMiddleware options

[cduff]

Steps to reproduce

npx create-react-app my-app
cd my-app
npm start

Unexpected output

(node:22848) [DEP_WEBPACK_DEV_SERVER_ON_AFTER_SETUP_MIDDLEWARE] DeprecationWarning: 'onAfterSetupMiddleware' option is deprecated. Please use the 'setupMiddlewares' option.
(Use `node --trace-deprecation ...` to show where the warning was created)
(node:22848) [DEP_WEBPACK_DEV_SERVER_ON_BEFORE_SETUP_MIDDLEWARE] DeprecationWarning: 'onBeforeSetupMiddleware' option is deprecated. Please use the 'setupMiddlewares' option.

My environment

• create-react-app 5.0.0
• node 16.13.1
• Windows 10

[Valker-Vinicius]

Any update?

[cduff]

Any update?

Looks like there's a PR open for this now: https://github.com/facebook/create-react-app/pull/11862

[ramdaniAli]

any idea on how to fix this ?

[mehrbaniyan]

Still having this issue. (with node 16.13.2) Edit: for anyone experiencing the same issue this might help.

[holub008]

1. This is just a deprecation warning. Nothing is currently broken. Rolling back to react-scripts@4 is unnecessary at this point and likely not a good idea.
2. The PR linked above (#11862) should fix the underlying issue (using deprecated webpack API). When that PR is released (looks like it will be in 5.0.1), update react-scripts to that version. No more warning, and you're future-proofed!

[Meligy]

Is there a workaround that can be done with craco or something until it's fixed?

Just trying to reduce false errors so that I can spot real issues earlier.

Thanks a lot.

[sbaggott]

1. This is just a deprecation warning. Nothing is currently broken. Rolling back to react-scripts@4 is unnecessary at this point and likely not a good idea.
2. The PR linked above (fix(webpackDevServer): fix deprecation warning #11862) should fix the underlying issue (using deprecated webpack API). When that PR is released (looks like it will be in 5.0.1), update react-scripts to that version. No more warning, and you're future-proofed!

Actually, this breaks our app locally. It's not just acting as a warning it's acting as an error and preventing the dev server from running. We are using react-scripts 5.0.1 and the fix is still not implemented in that version. @holub008 any idea when 5.0.2 will be released?

[Cezar04]

i had the same problem, i just changed the react-scripts from package.json to version 5.0.0. For hte moment it works

[holub008]

@sbaggott I'm not a maintainer, just an interested party. It does seem as though this is impacting a large number of users; Even more so if it's crashing the dev server (it was not crashing mine in 5.0.0, FWIW).

[sbaggott]

It looks like the crashing of the app was not related. I had to blow away my node_modules a couple times and restart, but finally got it to stop crashing.

On Wed, May 18, 2022 at 4:08 PM Karl Holub @.***> wrote:

@sbaggott https://github.com/sbaggott I'm not a maintainer, just an interested party. It does seem as though this is impacting a large number of users; Even more so if it's crashing the dev server (it was not crashing mine inn 5.0.0, FWIW).

— Reply to this email directly, view it on GitHub https://github.com/facebook/create-react-app/issues/11860#issuecomment-1130696195, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAEA34AWBPQER5476HCCKRTVKVZ5HANCNFSM5LA33DSQ . You are receiving this because you were mentioned.Message ID: @.***>

[mrwensveen]

Nonetheless, warnings like this can set you on wild goose hunts. Or worse, make you think most warnings can safely be ignored.

On Mon, May 23, 2022, 21:47 Sage Baggott @.***> wrote:

It looks like the crashing of the app was not related. I had to blow away my node_modules a couple times and restart, but finally got it to stop crashing.

On Wed, May 18, 2022 at 4:08 PM Karl Holub @.***> wrote:

@sbaggott https://github.com/sbaggott I'm not a maintainer, just an interested party. It does seem as though this is impacting a large number of users; Even more so if it's crashing the dev server (it was not crashing mine inn 5.0.0, FWIW).

— Reply to this email directly, view it on GitHub < https://github.com/facebook/create-react-app/issues/11860#issuecomment-1130696195 , or unsubscribe < https://github.com/notifications/unsubscribe-auth/AAEA34AWBPQER5476HCCKRTVKVZ5HANCNFSM5LA33DSQ

. You are receiving this because you were mentioned.Message ID: @.***>

— Reply to this email directly, view it on GitHub https://github.com/facebook/create-react-app/issues/11860#issuecomment-1135074609, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAJ2QDRZZTANMCBQGIDXYYDVLPOGVANCNFSM5LA33DSQ . You are receiving this because you are subscribed to this thread.Message ID: @.***>

[luis-neira]

CRACO Solution

For anyone using CRACO and is trying to override the devServer config, in order to resolve the DeprecationWarning, here is the solution.

import fs from "fs";

import NodePolyfillPlugin from "node-polyfill-webpack-plugin";
import evalSourceMap from "react-dev-utils/evalSourceMapMiddleware";
import redirectServedPath from "react-dev-utils/redirectServedPathMiddleware";
import noopServiceWorker from "react-dev-utils/noopServiceWorkerMiddleware";

import type { CracoConfig } from "@craco/craco";

const config: CracoConfig = {
  webpack: {
    plugins: {
      add: [
        new NodePolyfillPlugin({
          excludeAliases: ["console"],
        }),
      ] /* An array of plugins */,
    },
  },
  devServer: (devServerConfig, { env, paths }) => {
    devServerConfig = {
      onBeforeSetupMiddleware: undefined,
      onAfterSetupMiddleware: undefined,
      setupMiddlewares: (middlewares, devServer) => {
        if (!devServer) {
          throw new Error("webpack-dev-server is not defined");
        }

        if (fs.existsSync(paths.proxySetup)) {
          require(paths.proxySetup)(devServer.app);
        }

        middlewares.push(
          evalSourceMap(devServer),
          redirectServedPath(paths.publicUrlOrPath),
          noopServiceWorker(paths.publicUrlOrPath)
        );

        return middlewares;
      },
    };
    return devServerConfig;
  },
};

export default config;

I hope this helps someone. Happy hacking : )

[chris-dyke]

The solution found here - https://stackoverflow.com/questions/70469717/cant-load-a-react-app-after-starting-server

Updating from

const proxy = require('http-proxy-middleware');

module.exports = function(app) {
  app.use(proxy('/proxypath', { target: '<target path>' }));
};

to

const { createProxyMiddleware } = require('http-proxy-middleware');

module.exports = function(app) {
  app.use(createProxyMiddleware('/proxypath', { target: '<target path>' }));
};

Has fixed this for me

[prince272]

Upgrade to npx [email protected] my-app

[pankajuprety]

Any update?

Looks like there's a PR open for this now: #11862

What do you mean by PR

[morremeyer]

@pankajuprety PR is short for “Pull Request”. GitHub has pretty extensive documentation about PRs in https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-pull-requests.

[26haroon26]

hey, simple solution is here In file: node_modules/react-scripts/config/webpackDevServer.config.js like this

onBeforeSetupMiddleware(devServer) { // Keep evalSourceMapMiddleware// middlewares beforeredirectServedPath` otherwise will not have any effect // This lets us fetch source contents from webpack for the error overlay devServer.app.use(evalSourceMapMiddleware(devServer));

if (fs.existsSync(paths.proxySetup)) {
// This registers user provided middleware for proxy reasons
require(paths.proxySetup)(devServer.app);
}

}, onAfterSetupMiddleware(devServer) { // Redirect to PUBLIC_URL or homepage from package.json if url not match devServer.app.use(redirectServedPath(paths.publicUrlOrPath));

// This service worker file is effectively a 'no-op' that will reset any
// previous service worker registered for the same host:port combination.
// We do this in development to avoid hitting the production cache if
// it used the same host and port.
// https://github.com/facebook/create-react-app/issues/2272#issuecomment-302832432
devServer.app.use(noopServiceWorkerMiddleware(paths.publicUrlOrPath));

}`

change to

`setupMiddlewares: (middlewares, devServer) => { if (!devServer) { throw new Error('webpack-dev-server is not defined') }

if (fs.existsSync(paths.proxySetup)) {
    require(paths.proxySetup)(devServer.app)
}

middlewares.push(
    evalSourceMapMiddleware(devServer),
    redirectServedPath(paths.publicUrlOrPath),
    noopServiceWorkerMiddleware(paths.publicUrlOrPath)
)

return middlewares;

}`

[ChromeQ]

It is not advised to change files in the node_modules folder as @26haroon26 suggests above. Any changes there will be destroyed once dependencies are installed which should be happening on a production build or CI to ensure your deps are "clean".

If and I stress if there is a need to update node_modules dependencies then the safer solution is to use patch-package. But this should be as limited as possible and when no other solution is possible, the better and longer term solution is to either open a PR with the changes or jump over to an existing PR and subscribe to it to get updates when it is merged.

In this case I do not believe patching the package is necessary, and there is already an open PR #11862 to fix this, and since it is only a deprecation warning it can probably be ignored until it is merged. But if it is breaking your builds as some have suggested above then there are other solutions with craco as commented above or the same thing could probably be achieved using customize-cra. But the best solution is best to downgrade to v5.0.0 and wait for v5.0.2 as it is unlikely you require the fix in v5.0.1

[MikeMcC399]

@ChromeQ

• PR #11862, which you mention, was submitted over one year ago by @zhaomengfan, who has not been active in the PR since it was submitted and the PR currently fails CI tests. So the question is whether there is anybody who will actively sponsor the PR and clean it up so it can be merged?

[Havardmj]

Have this craco config that I'm trying to override the current proxy problem. But It don't seems to be working. Anyone have a suggestion why it's not co-operating as intended? Thx :)

const CracoLessPlugin = require('craco-less');
const path = require('path');
const { EnvironmentPlugin } = require('webpack');
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
const evalSourceMap = require('react-dev-utils/evalSourceMapMiddleware');
const redirectServedPath = require('react-dev-utils/redirectServedPathMiddleware');
const noopServiceWorker = require('react-dev-utils/noopServiceWorkerMiddleware');
const fs = require('fs-extra');

module.exports = {
    webpack: {
        plugins: [
            new BundleAnalyzerPlugin({
                analyzerMode: 'disabled',
                openAnalyzer: false,
            }),
            new EnvironmentPlugin({
                GIT_COMMIT_HASH: 'local-dev',
            }),
        ],
        alias: {
            '@': path.resolve(__dirname, 'src/'),
        },
    },
    devServer: (devServerConfig, { env, paths }) => {
        devServerConfig = {
            onBeforeSetupMiddleware: undefined,
            onAfterSetupMiddleware: undefined,

            setupMiddlewares: (middlewares, devServer) => {
                if (!devServer) {
                    throw new Error('webpack-dev-server is not defined');
                }
                if (fs.existsSync(paths.proxySetup)) {
                    require(paths.proxySetup)(devServer.app);
                }

                middlewares.push(
                    evalSourceMap(devServer),
                    redirectServedPath(paths.publicUrlOrPath),
                    noopServiceWorker(paths.publicUrlOrPath)
                );

                return middlewares;
            },
        };
        return devServerConfig;
    },
    plugins: [{ plugin: CracoLessPlugin }],
    eslint: {
        enable: true,
        mode: 'extends',
        configure: {
            extends: 'react-app',
            rules: {
                'react/jsx-pascal-case': 'off',
            },
        },
    },
    jest: {
        configure: {
            moduleNameMapper: {
                '^@/(.*)$': '<rootDir>/src/$1',
            },
        },
    },
};

[delacruzjames]

Any updates Solutions for this?

Options

1. Aws S3
2. Aws Amplify
3. VercelApp

[u-zer1]

Any updates?

[MikeMcC399]

https://github.com/babel/babel-plugin-proposal-private-property-in-object is showing the following message, so if it is true that "the create-react-app project ... is not maintianed (sic) anymore", then it would be helpful if this statement appeared explicitly in this repository's README to avoid having to "read between the lines"!

One of your dependencies, babel-preset-react-app, is importing the "@babel/plugin-proposal-private-property-in-object" package without declaring it in its dependencies. This is currently working because "@babel/plugin-proposal-private-property-in-object" is already in your node_modules folder for unrelated reasons, but it may break at any time.

babel-preset-react-app is part of the create-react-app project, which is not maintianed anymore. It is thus unlikely that this bug will ever be fixed. If you are starting a new project, you may consider using maintained alternatives such as Vite (https://vitejs.dev/) instead.

Add "@babel/plugin-proposal-private-property-in-object" to your devDependencies to work around this error. This will make this message go away.

[rathorer]

This is really bad, I am facing issue during our deployment phase. We have developed our app and when trying to deploy on azure, where its treating these warnings as error and the project is not working. Its failing to start. Below is not feasible solution for us, as the new deployment will override the change: https://stackoverflow.com/questions/70469717/cant-load-a-react-app-after-starting-server

If create-react-app is not maintained, then it should be mentioned in the documentation so people don't end up stuck in the middle.

[morremeyer]

@rathorer Unfortunately, the project is not only unmaintained, but has been completely abandoned.

There's no other choice right now than to migrate to another tool.

[holub008]

It's understandable if CRA is no longer being maintained. It's disappointing & unprofessional that maintainers haven't come forward to announce deprecation or intent to continue developing v5. There may be organizational factors impacting maintainers' ability to make such an announcement.

So it seems no one can come forward to tell you CRA is deprecated with certainty, but IMO any maintained project should be migrated. 2 years since a release, with downstream tools jumping major versions is a security & compatibility liability. NPM download data speaks to developer outlook on CRA:

I recently migrated off CRA to vite. It took a couple days on my enterprise-grade app but was straightforward with good documentation. Good luck!

[MikeMcC399]

• It's been raised as a specific issue in #13393 however I don't hold much hope that it will lead to any action if there are no longer any active maintainers for the repo.

[cduff]

I opened this issue in Dec 2021. FYI I've since migrated my SPA to Next.js using an approach like https://nextjs.org/docs/app/building-your-application/upgrading/from-vite.

Vite also looked like a good option, but I had other non-SPA projects using Next, so decided to standardise on it.

Everything is going well, and the DX is far superior to CRA. Full disclosure: there is one key issue I'm currently working around: https://github.com/vercel/next.js/issues/56636.

[nktka]

The solution found here - https://stackoverflow.com/questions/70469717/cant-load-a-react-app-after-starting-server

Updating from

const proxy = require('http-proxy-middleware');

module.exports = function(app) {
  app.use(proxy('/proxypath', { target: '<target path>' }));
};

to

const { createProxyMiddleware } = require('http-proxy-middleware');

module.exports = function(app) {
  app.use(createProxyMiddleware('/proxypath', { target: '<target path>' }));
};

Has fixed this for me

If anyone has react scripts silently failing with no errors, I did a reverse of this suggestion when migrating from react-scripts 4.0.3 to 5.0.1 and it worked! Just swap "to" and "from".