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Publishing a new version of @mdn/browser-compat-data

Project owners publish new releases of @mdn/browser-compat-data on npm. MDN staff deploy the package to the MDN site. Usually, this happens every Thursday (MDN never deploys to production on Fridays).

Before you begin

Any project owner (or release designee) can complete the following steps to publish a new version, but please coordinate releases with @ddbeck.

The steps in this process assume:

Prepare for an upcoming release

Anticipate a release by keeping a running draft pull request to prepare documentation and metadata for the release. See #9466 as an example.

Start preparing a release when:

  • the first pull request labeled needs-release-note 📰 has been merged after the most-recent release
  • you're ready to issue a new release

whichever comes first.

  1. Start a new branch for the upcoming release. For example, run git switch -c release-YYYY-MM-DD, where YYYY-MM-DD is the target release date.

  2. Increment the package version with npm version --no-git-tag-version and commit the change.

    For example, to increment the version for a routine data update with no breaking changes or new features, run npm version --no-git-tag-version patch, then commit the changes to the package metadata files.

    If needed, you can repeat this step on the same branch, using a minor or major argument (instead of patch), to increment the version for newly-introduced features or breaking changes (see Semantic versioning policy).

  3. Add a section for the upcoming release to RELEASE_NOTES.md. Use the previous release as a template. Omit or leave a placeholder for the statistics.

  4. Push the release branch to your remote, then open a draft pull request.

  5. Until you're ready to issue a release, add more release notes to the draft pull request, when such changes are merged.

Finalizing a release

When a release is imminent:

  1. Confirm that all pull requests labeled needs-release-note 📰 have been entered into the release notes. Run npm run release-pulls to get a link to all of the labeled pull requests since the previous release to HEAD.

  2. Add the release statistics to the release notes. Switch to the main branch, then run npm run release-stats. After completing the prompts, copy the output, switch back to the release branch, and add the statistics to RELEASE_NOTES.md.

  3. Push any outstanding changes to the release branch.

  4. Mark the pull request as ready for review. If applicable or desired, seek a review, then merge the pull request.

The package is now ready to be published.

Publish to npm

  1. Start a draft release on GitHub.

    • In the Tag version and Release title fields, enter vX.Y.Z where X.Y.Z in the version number in package.json.
    • In the Describe this release field, paste the release note text from RELEASE_NOTES.md.

    Note: If you're not ready to publish to npm, click Save draft in GitHub and resume this process later.

  2. Click Publish release to create the tag and trigger the workflow that publishes to npm. Wait for the release GitHub Actions workflow to finish successfully.

  3. Check @mdn/browser-compat-data on npm to see if the release shows up correctly.

The package is now published and you have finished releasing BCD! 🎉