How can I clear the Jest cache?

Question

Jest is picking up an old version of a package and thus my tests fail unless I use --no-cache. I can even delete the package folder from folder node_modules and Jest is happy to run the tests (almost all are passing).

So how do I clear the Jest cache?

Skinnydip

Answer 1

You can find the cache location by running jest --showConfig. Look for the cacheDirectory key. Its value is the name of the folder you'll need to remove.

Connolly

is there any reason the cache location should be anywhere outside the project the tests run in? – Canaday

@Canaday why do you expect any reasons from facebook team? – Speight

Answer 2

Just run:

jest --clearCache

If you have installed Jest as a dependency in your Node.js project and the jest command doesn't work, just create a new script inside your package.json file.

{
    ...
    "scripts:" {
        "clear_jest": "jest --clearCache"
    }
    ...
}

And then, run in your terminal:

npm run clear_jest

---

With modern NPM, you could also run (credits to johny):

npx jest --clearCache

Knish

With modern NPM, you could also run npx jest --clearCache – Selfconscious

If you have installed Jest as a dependency, then you likely have added a script to run it. Assuming that script is named 'test': npm run test -- --clearCache willl pass the clearCache flag along. – Constitutional

This solved my issue - github.com/storybookjs/storybook/issues/7152. I didnt have direct Jest. Used npx jest --clearCache – Gainor

Answer 3

As of Jest 22.0.0+, you can use the --clearCache option:

Deletes the Jest cache directory and then exits without running tests. Will delete cacheDirectory if the option is passed, or Jest's default cache directory.

Hemispheroid

Answer 4

First, you need to know the Jest version:

yarn jest --version

---

Jest >= 22.0.0

yarn jest --clearCache

Jest < 22.0.0

yarn jest --showConfig | grep cacheDir

Returns (you need to remove that folder)

      "cacheDirectory": "/tmp/jest_rs",

Then, you remove it

rm -rf /tmp/jest_rs

---

If you don’t use Yarn, do instructions with npx jest.

Praedial

Answer 5

If using nx monorepo run following command to clear the cache

nx test <packageName> --clearCache

Cystolith