After having used Yarn almost exclusively for the past couple of years, there has been one nagging issue which seemed to continually crop up. Specifically, the inability to have a project’s package.json dependency versions kept in sync with the versions in yarn.lock. And so, while running
yarn upgrade results in all packages being updated to the latest versions (as specified via the given semver ranges), the versions defined in package.json are not updated to reflect that which they have been upgraded to.
This can prove problematic as, one can not easily discern a project’s dependency versions by simply viewing their respective values in package.json.
In particular, as part of process, after each production release I have scripts which are executed to automate the updating of all project dependencies to their respective latest Minor and Patch revisions prior to opening master for new development. While the scripts manage the updates and committals internally, each project’s package.json would remain unmodified, making it challenging to determine which packages have been upgraded, and which have not. Having to automate or manually inspect the yarn.lock files is less than ideal, and quite cumbersome to say the least.
For example, to sync a project’s package.json with the project’s yarn.lock, and have the ranges remain intact while updating the versions to reflect what will actually be installed, simply run:
syncyarnlock -s -k.
This will result in the dependency ranges being preserved, while also updating their versions to reflect the versions that will actually be installed.
And with that, we have proper syncing. A definite time-saver!
Originally published at Eric Feminella.