tsc-check.yml

name: Check for New TypeScript Errors

on:
  workflow_dispatch:
  pull_request:
    branches:
      - main
      - test-action

jobs:
  check-tsc-errors:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout the repository
        uses: actions/checkout@v3

      - name: Fetch target and PR branches
        run: git fetch origin ${{ github.base_ref }}:${{ github.base_ref }} ${{ github.head_ref }}:${{ github.head_ref }}

      - name: Download artifact from target branch
        id: download-artifact
        uses: actions/download-artifact@v2
        with:
          name: ${{ github.base_ref_slug }}-tsc-output
          path: base-tsc-output
        continue-on-error: true

      - name: Check if artifact exists
        id: check-artifact
        run: |
          if [ -f base-tsc-output/tsc_output.txt ]; then
            echo "Artifact found."
            echo "artifact-found=true" >> $GITHUB_ENV
          else
            echo "Artifact not found."
            echo "artifact-found=false" >> $GITHUB_ENV
          fi

      - name: Generate base errors if artifact not found
        if: env.artifact-found == 'false'
        run: |
          set -e
          echo "Checking out base branch"
          git checkout ${{ github.base_ref }}
          echo "Creating output directory"
          mkdir -p base-tsc-output
          echo "Running tsc"
          npx tsc --noEmit --pretty false > base-tsc-output/tsc_output.txt || { echo 'tsc command failed'; exit 1; }
          echo "Extracting errors"
          grep -oE '^[^ ]+.ts:[0-9]+:[0-9]+' base-tsc-output/tsc_output.txt | sort -u > base-tsc-errors.txt || { echo 'grep command failed'; exit 1; }

      - name: Extract errors from artifact if found
        if: env.artifact-found == 'true'
        run: |
          grep -oE '^[^ ]+.ts:[0-9]+:[0-9]+' base-tsc-output/tsc_output.txt | sort -u > base-tsc-errors.txt || { echo 'grep command failed'; exit 1; }

      - name: Checkout PR branch
        run: git checkout ${{ github.head_ref }}

      - name: Install dependencies for PR branch
        uses: ./.github/actions/setup

      - name: Run tsc on PR branch
        run: |
          npx tsc --noEmit --pretty false > head-tsc-output.txt || { echo 'tsc command failed'; exit 1; }

      - name: Extract errors from PR branch
        run: |
          grep -oE '^[^ ]+.ts:[0-9]+:[0-9]+' head-tsc-output.txt | sort -u > head-tsc-errors.txt || { echo 'grep command failed'; exit 1; }

      - name: Check PR errors file existence
        run: |
          if [ ! -f head-tsc-errors.txt ]; then
            echo "PR errors file not found!"
            exit 1
          fi

      - name: Sort and compare errors
        run: |
          sorted_base_errors=$(sort base-tsc-errors.txt)
          sorted_pr_errors=$(sort head-tsc-errors.txt)
          echo "$sorted_base_errors" > sorted-base-tsc-errors.txt
          echo "$sorted_pr_errors" > sorted-head-tsc-errors.txt
          new_errors=$(comm -13 sorted-base-tsc-errors.txt sorted-head-tsc-errors.txt)

          if [ -n "$new_errors" ]; then
            echo "New TypeScript errors introduced:"
            echo "$new_errors"
            exit 1
          else
            echo "No new TypeScript errors introduced."
          fi