typescript-nightly.yml

name: typescript-nightly

on:
  schedule:
    # Schedule to run nightly at midnight
    - cron: '0 0 * * *'
  workflow_dispatch:

jobs:
  compare:
    runs-on: macos-latest
    steps:
      - name: Set up Node.js
        uses: actions/setup-node@v3
        with:
          node-version: 18

      - name: Get latest TypeScript version
        id: get-versions
        run: |
          # Fetch the latest published version of TypeScript on npm
          latest_version=$(npm show typescript dist-tags.latest)

          # Get the currently installed version
          rc_version=$(npm show typescript dist-tags.rc)

          latest_major_minor=$(echo "$latest_version" | cut -d '.' -f 1,2)
          rc_major_minor=$(echo "$rc_version" | cut -d '.' -f 1,2)

          echo "latest_version=$latest_major_minor" >> $GITHUB_OUTPUT
          echo "rc_version=$rc_major_minor" >> $GITHUB_OUTPUT

  test:
    runs-on: macos-latest
    # Skip TypeScript compatibility check on "main".
    # A merged pull request implies passing "typescript" job.
    if: ${{ needs.compare.outputs.latest_version != needs.compare.outputs.rc_version }}
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Set up Node.js
        uses: actions/setup-node@v3
        with:
          node-version: 18

      - name: Set up pnpm
        uses: pnpm/action-setup@v4
        with:
          version: 8.15.6

      - name: Install dependencies
        run: pnpm install

      - name: Build
        run: pnpm build

      - name: Install TypeScript RC
        run: pnpm add typescript@rc

      - name: Write tsconfig
        run: |
          cp test/typings/tsconfig.5.2.json test/typings/tsconfig.${needs.compare.outputs.rc_version}.json

      - name: Typings tests
        run: |
          pnpm tsc --version
          pnpm test:ts