Jest clear cache


Problem

When your Jest tests used to pass but suddenly started to fail, this may be related to cache.

In my case, the test coverage was reporting uncovered lines. When I cleared my Jest cache, the tests passed again.

Solution

To clear cache with Yarn:

yarn jest --clearCache

Output:

yarn run v1.9.4
./node_modules/.bin/jest --clearCache
Cleared /var/folders/c8/hg7gtddj49qgpvghtv2grkp9j21wxz/T/jest_r86htr
✨  Done in 0.54s.

Or with npx:

npx jest --clearCache


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