A very simple action that checks PRs to see if a Prisma schema has lines removed and if there are non Prisma file changes in the PR. If both conditions are true, it will post a configurable message or fail the check.

You may want this to ensure minimal downtime or deploy errors, but it isn’t always accurate. It should be used as a loose rule. This is my first stab at the action; it could definitely be improved!


name: Migration Warning

on: [pull_request]

    name: Unsafe Migration Check
    runs-on: ubuntu-latest
      - uses: actions/[email protected]
          fetch-depth: 0
      - uses: ianmitchell/[email protected]
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          # Options go here
          fail: true


  • main-branch [OPTIONAL] – the name of the main branch (sometimes master). Defaults to main.
  • path [OPTIONAL] – the path to the Prisma directory. Defaults to prisma.
  • warning [OPTIONAL] – whether to post a warning comment or not in the PR. Defaults to true.
  • message [OPTIONAL] – the message to post in the PR. Defaults to a generic warning message.
  • repeat [OPTIONAL] – whether to post a warning comment every time the action is run. Defaults to false.
  • fail [OPTIONAL] – whether to fail the PR check if the action fails. Defaults to false.


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