workflows/lint.yml

name: Lint
on:
  pull_request:
  push:
    branches:
      - main

jobs:
  lint:
    runs-on: ubuntu-latest
    timeout-minutes: 10

    steps:
      - uses: actions/checkout@v3
        with:
          # Could use something like rmacklin/fetch-through-merge-base@v0 instead when the repo gets bigger
          fetch-depth: 0
      - name: "Extracting the merge base into 'SINCE'"
        id: since
        run: |
          if [ -z $PR_REF ]
          then
            echo "SINCE=$SHA^1" >> $GITHUB_OUTPUT
          else
            echo "SINCE=$(git merge-base $BASE_REF $SHA)" >> $GITHUB_OUTPUT
          fi
        env:
          PR_REF: ${{  github.event.pull_request.head.ref }}
          BASE_REF: origin/${{ github.event.pull_request.base.ref }}
          SHA: ${{ github.sha }}

      - run: npm install -g corepack@latest && corepack enable

      - uses: actions/setup-node@v3
        with:
          node-version: "20"
          cache: "pnpm"
          cache-dependency-path: "**/pnpm-lock.yaml"
      - run: |
          pnpm install --frozen-lockfile --filter .
          pnpm install --frozen-lockfile --filter ...[${{ steps.since.outputs.SINCE }}]...
          pnpm --filter ...[${{ steps.since.outputs.SINCE }}]... build
      - name: "Checking lint errors"
        run: |
          pnpm --filter ...[${{ steps.since.outputs.SINCE }}] lint:check

      - name: "Checking format errors"
        run: |
          # Could also use pnpm --filter [${{ steps.since.outputs.SINCE }}] format:check
          # But this way we can see the diff
          pnpm -r format
          git diff | head -n 100
          git diff --name-only --exit-code

      - name: Check types
        run: pnpm --filter ...[${{ steps.since.outputs.SINCE }}] check