Suggestion: cacheDirectory should default to something local

[quantizor]

Using the OS tmp directory for Jest's ephemeral generated assets means that most CIs can't reliably cache it and keep test runs consistently fast.

Using a default cacheDirectory like node_modules/.jest-cache would stash away those files in a spot that most (if not all) devs have git-ignored and workspace-ignored by default, but also remain completely cacheable by container-based CI services like Travis.

[cpojer]

cacheDirectory is configurable for this reason. We used to store it inside of Jest but it was always a huge issue to people so we changed to a temp folder. Please configure Jest the way you like for your CI :)

[github-actions]

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