How to sync `yarn.lock` with `package.json`?
Run yarn install, or just yarn.
The lock file is updated in its entirety on any change to dependencies, i.e. when you run a yarn command.
From the Yarn docs:
Your yarn.lock file is auto-generated and should be handled entirely by Yarn. As you add/upgrade/remove dependencies with the Yarn CLI, it will automatically update your yarn.lock file. Do not edit this file directly as it is easy to break something.
(Emphasis my own)
If you ever face a checksum issue this will solve it,
YARN_CHECKSUM_BEHAVIOR=update yarn