Backpack configuration and scripts for Create React App.

Usage no npm install needed!

<script type="module">
  import backpackReactScripts from '';



Important: The currently supported version of CRA by backpack-react-scripts is up to v2.1.2. Versions above this will not work.

This package is a fork of Create React App (specifically the react-scripts package). It's intended to be used in conjuction with create-react-app like so:

npx create-react-app@2.1.2 my-app --scripts-version=backpack-react-scripts@7.0.5

# start your app development like you normally would with `create-react-app`
cd my-app
npm start

What is different in our fork?

  • Compilation of uncompiled Backpack components (specifically JSX).
  • Skyscanner specific template with Backpack components integrated out of the box.
  • CSS Modules enabled by default for all .css & .scss files.
  • Ability to create a bundle for server side rending.
  • Automatic chunking is disabled by default.
  • css.html & js.html: New files in the build/ output folder. These are html partials that include <script /> and <link /> references to the various static assets output by webpack. Useful if automatic chunking is turned on and you don't want to worry about order.
  • A bunch of configuration options via "backpack-react-scripts" field in package.json:
    • crossOriginLoading: Modify the default behaviour, see docs.
    • babelIncludePrefixes: An array of module name prefixes to opt into babel compilation. Includes ["@skyscanenr/", "bpk-", "saddlebag-"] by default.
    • enableAutomaticChunking: Boolean, opt in to automatic chunking of vendor, common and app code.
    • vendorsChunkRegex: String, Regex for picking what goes into the vendors chunk. See cacheGroups in webpack docs. Dependent on enableAutomaticChunking being enabled
    • amdExcludes: Array of module names to exclude from AMD parsing. Incldues ["lodash"] by default.
    • externals: exposing the Webpack config to modify externals, see docs.
    • ssrExternals: Similar to above, but for ssr.js only.
    • cssModules: Boolean, true by default.

Releasing a new version of backpack-react-scripts

  1. To publish a new version of backpack-react-scripts, run the following command:

    npm run publish -- --scope backpack-react-scripts
  2. You will be prompted to select a new semver version (MAJOR, MINOR, PATCH). Use the to decide on the nature of the changes since the last release.

    • If you want to be extra careful, you can publish a prerelease by running this instead:
    npm run publish -- --scope backpack-react-scripts --canary
  3. Update the with the new version, taking care to follow the format of previous releases.

Keeping this fork updated

We wish to keep this fork updated with the upstream repo to benefit from the ongoing open source development of create-react-app. To keep this fork up to date, please follow the steps below:

  1. Ensure master is in sync with upstream/master:

    git checkout master
    git remote add upstream
    git fetch upstream
    git reset --hard upstream/master
    git push --force-with-lease
  2. Rebase fork on top of a tagged release on master:

    git checkout fork
    git rebase <commit>

    Note: <commit> should be the SHA-1 of the latest upstream release - not just the latest i.e. upstream/master

  3. Pair with someone else to fix any conflicts and cross examine changes in upstream with changes in our fork.

    This is the most time consuming part. Take care to make sure you are not regressing any functionality that we have added in our fork.

  4. Re-name your local, rebased fork branch to something else and push it to origin. This will ensure it runs through CI and you can verify your changes.

    git branch -m <branch>
    git push origin <branch>
  5. Finally, when we are confident that the rebase has been successful, re-name your branch back to fork and push it to origin:

    git branch -m fork
    git push --force-with-lease