frontend-optional.yml

name: '[NOT REQUIRED] frontend (optional)'

on:
  pull_request:

# Cancel in progress workflows on pull_requests.
# https://docs.github.com/en/actions/using-jobs/using-concurrency#example-using-a-fallback-value
concurrency:
  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
  cancel-in-progress: true

# hack for https://github.com/actions/cache/issues/810#issuecomment-1222550359
env:
  SEGMENT_DOWNLOAD_TIMEOUT_MINS: 3
  NODE_OPTIONS: '--max-old-space-size=5120'

jobs:
  files-changed:
    name: detect what files changed
    runs-on: ubuntu-24.04
    timeout-minutes: 3
    # Map a step output to a job output
    outputs:
      testable_modified: ${{ steps.changes.outputs.testable_modified }}
      testable_rules_changed: ${{ steps.changes.outputs.testable_rules_changed }}
      typecheckable_rules_changed: ${{ steps.changes.outputs.typecheckable_rules_changed }}
      frontend_all: ${{ steps.changes.outputs.frontend_all }}
      merge_base: ${{ steps.merge_base.outputs.merge_base }}
    steps:
      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
        with:
          fetch-depth: 100

      - name: Check for frontend file changes
        uses: dorny/paths-filter@0bc4621a3135347011ad047f9ecf449bf72ce2bd # v3.0.0
        id: changes
        with:
          token: ${{ github.token }}
          filters: .github/file-filters.yml
          list-files: shell

      # On PRs, HEAD is the merge commit; its parents (HEAD^1, HEAD^2) are base and head.
      # Merge base of those two is what Jest --changedSince needs.
      # If merge base can't be computed or non-frontend files changed, output is empty
      # and the optional Jest job will be skipped entirely.
      - name: Get merge base for changedSince
        id: merge_base
        run: |
          MERGE_BASE=$(git merge-base HEAD^1 HEAD^2 2>/dev/null) || true
          if [ -n "$MERGE_BASE" ]; then
            CHANGED=$(git diff --name-only "$MERGE_BASE" HEAD^2)
            if echo "$CHANGED" | grep -qvE '^static/'; then
              echo "Non-frontend file changed — skipping optional Jest"
              MERGE_BASE=""
            else
              echo "Merge base: $MERGE_BASE (Jest will use --changedSince)"
            fi
          else
            echo "Could not compute merge base — skipping optional Jest"
          fi
          echo "merge_base=${MERGE_BASE:-}" >> "$GITHUB_OUTPUT"

  # This job intentionally mirrors `frontend-jest-tests` in frontend.yml.
  # Our intent is to try it out for a few weeks and see if it's stable.
  frontend-jest-tests-changed-only:
    if: >-
      needs.files-changed.outputs.merge_base != '' &&
      (needs.files-changed.outputs.testable_rules_changed == 'true' || needs.files-changed.outputs.testable_modified == 'true')
    needs: [files-changed]
    name: Jest
    # If you change the runs-on image, you must also change the runner in jest-balance.yml
    # so that the balancer runs in the same environment as the tests.
    runs-on: ubuntu-24.04
    timeout-minutes: 30
    strategy:
      # This helps not having to run multiple jobs because one fails, thus, reducing resource usage
      # and reducing the risk that one of many runs would turn red again (read: intermittent tests)
      fail-fast: false
      matrix:
        # XXX: When updating this, make sure you also update CI_NODE_TOTAL.
        instance: [0, 1, 2, 3]

    steps:
      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
        name: Checkout sentry
        with:
          # PRs need history so we can compute merge base for Jest --changedSince.
          # 100 is an arbitrary depth that will get most reasonable PRs' commits.
          fetch-depth: ${{ github.event_name == 'pull_request' && '100' || '1' }}

      - uses: ./.github/actions/setup-node-pnpm

      - name: jest transform cache
        uses: actions/cache@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4.2.0
        with:
          path: |
            .cache/jest
            ~/.cache/swc
          key: jest-cache-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml', 'jest.config.ts') }}-${{ matrix.instance }}
          restore-keys: |
            jest-cache-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml', 'jest.config.ts') }}-
            jest-cache-${{ runner.os }}-

      - name: Download jest-balance.json
        id: download-artifact
        uses: dawidd6/action-download-artifact@ac66b43f0e6a346234dd65d4d0c8fbb31cb316e5 # v11
        with:
          workflow: 38531594 # jest-balancer.yml
          workflow_conclusion: success # The conclusion of the workflow we're looking for
          branch: master # The branch we're looking for
          name: jest-balance.json # Artifact name
          name_is_regexp: false
          path: tests/js/test-balancer/ # Directory where to extract artifact(s), defaults to the current directory
          search_artifacts: true # Search for the last workflow run whose stored the artifact we're looking for
          if_no_artifact_found: warn # Can be one of: "fail", "warn", "ignore"

      - name: jest
        env:
          GITHUB_PR_SHA: ${{ github.event.pull_request.head.sha || github.sha }}
          GITHUB_PR_REF: ${{ github.event.pull_request.head.ref || github.ref }}
          # XXX: CI_NODE_TOTAL must be hardcoded to the length of strategy.matrix.instance.
          #      Otherwise, if there are other things in the matrix, using strategy.job-total
          #      wouldn't be correct.
          CI_NODE_TOTAL: 4
          CI_NODE_INDEX: ${{ matrix.instance }}
          # Disable testing-library from printing out any of of the DOM to
          # stdout. No one actually looks through this in CI, they're just
          # going to run it locally.
          #
          # This quiets up the logs quite a bit.
          DEBUG_PRINT_LIMIT: 0
          MERGE_BASE: ${{ needs.files-changed.outputs.merge_base }}
        run: pnpm run test-ci --forceExit

  typescript-native:
    if: needs.files-changed.outputs.frontend_all == 'true'
    needs: files-changed
    name: '@typescript/native-preview'
    runs-on: ubuntu-24.04
    continue-on-error: true
    steps:
      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7

      - uses: ./.github/actions/setup-node-pnpm

      - name: setup matchers
        run: |
          echo "::remove-matcher owner=masters::"
          echo "::add-matcher::.github/tsc.json"

      - name: tsgo
        id: tsgo
        run: pnpm run typecheck