Run the checks on every change

How to do it

Use a CI service, such as GitHub Actions or GitLab CI. Start from a clean checkout, install from the lock file and run the same script as the deploy. Pin each outside action to a full commit hash, and give the job read-only access, as build secrets explains. Set a time limit on the job, and cancel older runs for the same branch. Include the formatter in its check mode. Keep it fast, so people wait for it instead of skipping it.

Example

# .github/workflows/check.yml
name: check
on: [push, pull_request]
permissions:
  contents: read
concurrency:
  group: check-${{ github.ref }}
  cancel-in-progress: true
jobs:
  check:
    runs-on: ubuntu-latest
    timeout-minutes: 20
    steps:
      - uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803 # v6.1.0
      - uses: actions/setup-node@249970729cb0ef3589644e2896645e5dc5ba9c38 # v6.5.0
        with: { node-version-file: .nvmrc }
      - run: npm ci
      - run: ./check.sh

How to check

Push a commit that breaks one test. The pull request shows a failed check before the job's time limit, such as 20 minutes.