uppy/.github/workflows/output-watcher.yml

name: Compare JS output

on:
  pull_request_target:
    # We want all branches so we configure types to be the GH default again
    types: [opened, synchronize, reopened]
    paths:
      - 'packages/@uppy/*/src/**/*'
      - '.github/workflows/output-watcher.yml'

permissions:
  pull-requests: write
env:
  YARN_ENABLE_GLOBAL_CACHE: false
  DIFF_BUILDER: true

jobs:
  compare_diff:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout sources
        uses: actions/checkout@v3
        with:
          fetch-depth: 2
          ref: refs/pull/${{ github.event.pull_request.number }}/merge
      - run: git reset HEAD^ --hard
      - name: Get yarn cache directory path
        id: yarn-cache-dir-path
        run:
          echo "dir=$(corepack yarn config get cacheFolder)" >> $GITHUB_OUTPUT

      - uses: actions/cache@v3
        id: yarn-cache # use this to check for `cache-hit` (`steps.yarn-cache.outputs.cache-hit != 'true'`)
        with:
          path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
          key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
          restore-keys: |
            ${{ runner.os }}-yarn-
      - name: Install Node.js
        uses: actions/setup-node@v3
        with:
          node-version: lts/*
      - name: Install dependencies
        run:
          corepack yarn workspaces focus $(corepack yarn workspaces list --json
          | jq -r .name | awk '/^@uppy-example/{ next } { if ($0!="uppy.io")
          print $0 }')
        env:
          # https://docs.cypress.io/guides/references/advanced-installation#Skipping-installation
          CYPRESS_INSTALL_BINARY: 0
      - run: corepack yarn build:lib
      - name: Store output file
        run: tar cf /tmp/previousVersion.tar packages/@uppy/*/lib
      - name: Fetch source from the PR
        run: git checkout FETCH_HEAD -- packages
      - run: corepack yarn build:lib
      - name: Store output file
        run: tar cf /tmp/newVersion.tar packages/@uppy/*/lib
      - name: Setup git
        run: |
          git config --global user.email "actions@github.com"
          git config --global user.name "GitHub Actions"
          git init /tmp/uppy
          echo '*.map' > /tmp/uppy/.gitignore
      - name: Extract previous version
        run: cd /tmp/uppy && tar xf /tmp/previousVersion.tar
      - name: Commit previous version
        run: cd /tmp/uppy && git add -A . && git commit -m 'previous version'
      - name: Extract new version
        run: cd /tmp/uppy && tar xf /tmp/newVersion.tar
      - name: Build diff
        id: diff
        run: |
          EOF=$(dd if=/dev/urandom bs=15 count=1 status=none | base64)
          echo "OUTPUT_DIFF<<$EOF" >> "$GITHUB_OUTPUT"
          cd /tmp/uppy && git --no-pager diff --ignore-blank-lines >> "$GITHUB_OUTPUT"
          echo "$EOF" >> "$GITHUB_OUTPUT"
      - name: Add/update comment
        uses: marocchino/sticky-pull-request-comment@v2
        with:
          message: |
            <details><summary>Diff output files</summary>

            ```diff
            ${{ steps.diff.outputs.OUTPUT_DIFF || 'No diff' }}
            ```

            </details>