TIL: Configuring pre-commit Hooks for Python and Node Repos

Every team has that one member who forgets to lint before pushing. pre-commit automates it.

# .pre-commit-config.yaml
repos:
  - repo: https://github.com/pre-commit/pre-commit-hooks
    rev: v4.3.0
    hooks:
      - id: trailing-whitespace
      - id: end-of-file-fixer
  - repo: https://github.com/psf/black
    rev: 22.8.0
    hooks:
      - id: black

Install and activate.

pip install pre-commit
pre-commit install

Now every git commit runs the hooks. If trailing whitespace exists, the commit fails. Fix the issue, stage the fix, commit again. Clean repo, no reminders.

pre-commit run --all-files

Run all hooks against every file in the repo. Useful for CI checks or cleaning up a legacy codebase.

Does pre-commit work with Node projects?

Yes. Add eslint or prettier hooks using the same repo URL pattern. The hooks are language agnostic.