NPM Lockfile

We use yarn.lock to lock down our dependency versions. This allows us to freeze all dependencies at the exact version we have installed in our node_modules.

Generating The Lockfile

Yarn will automattically generate and update the lock file whenever yarn, yarn install or yarn add is called. If you've manually updated a package.json file then Yarn will update the lock file as necessary.

Testing

To verify that the new yarn.lock works:

Run yarn run distclean to delete local node_modules
Run yarn install --immutable
Verify that Calypso works as expected and that tests pass