Fix for CI Error: "Your lockfile needs to be updated, but yarn was run with `--frozen-lockfile`."

fix.md

Error:

CI pipeline buld fails with an error looking like this:

error Your lockfile needs to be updated, but yarn was run with `--frozen-lockfile`.
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.

Cause:

• The CI tool is trying to install project dependencies using yarn install --frozen-lockfile
• Context: The --frozen-lockfile flag tells yarn not to create a yarn.lock file or fail if an update is requried to an existing one. See cli docs
• Context: This is the default behaviour of many CI toos as it makes a lot of sense to avoid writing to yarn.lock just to run CI builds.
• In a case where the package list file(package.json) is updated and such update is not reflected(or commited) in the already existing(and commited) yarn.lock, there's no way yarn install --frozen-lockfile would run successfully and as a result the job fails.

Fix:

• Re-run yarn install on your local and be sure to commit the changes to yarn.lock file. Error should be fixed afterwards.

Thank you, very helpful