Incorrect integrity when fetching from the cache

Question

When running yarn add --dev jest, I got error Incorrect integrity when fetching from the cache.

Full output:

Answer 1

yarn cache clean

To fix this, run:

yarn cache clean
yarn add --dev jest

From the yarn cache documentation:

yarn cache clean []

Running this command will clear the global cache. It will be populated again the next time yarn or yarn install is run. Additionally, you can specify one or more packages that you want to clean.

You can also see where the cache is with yarn cache dir.

yarn cache dir

Running yarn cache dir will print out the path where yarn’s global cache is currently stored.