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[READ-ONLY] Mirror of https://github.com/vitest-dev/vitest. Next generation testing framework powered by Vite. vitest.dev
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vitest docs config update.md
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at attempts-api-prototype

title: update | Config outline: deep #

update {#update} #

  • Type: boolean | 'new' | 'all' | 'none'
  • Default: false
  • CLI: -u, --update, --update=false, --update=new, --update=none

Define snapshot update behavior.

  • true or 'all': updates all changed snapshots and deletes obsolete ones
  • new: generates new snapshots without changing or deleting obsolete ones
  • none: does not write snapshots and fails on snapshot mismatches, missing snapshots, and obsolete snapshots

When update is false (the default), Vitest resolves snapshot update mode by environment:

  • Local runs (non-CI): works same as new
  • CI runs (process.env.CI is truthy): works same as none