frontend.yml

name: frontend

on:
  push:
    branches:
      - master
  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=4096'

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_modified_files: ${{ steps.changes.outputs.testable_modified_files }}
      testable_rules_changed: ${{ steps.changes.outputs.testable_rules_changed }}
      frontend_all: ${{ steps.changes.outputs.frontend_all }}
    steps:
      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7

      - 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

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

      - uses: actions/setup-node@1e60f620b9541d16bece96c5465dc8ee9832be0b # v4
        id: setup-node
        with:
          node-version-file: '.volta.json'

      - name: node_modules cache
        uses: actions/cache@13aacd865c20de90d75de3b17ebe84f7a17d57d2 # v4.0.0
        id: nodemodulescache
        with:
          path: node_modules
          key: ${{ runner.os }}-node-modules-${{ hashFiles('yarn.lock', 'api-docs/yarn.lock', '.volta.json') }}

      - name: Install Javascript Dependencies
        if: steps.nodemodulescache.outputs.cache-hit != 'true'
        run: yarn install --frozen-lockfile

      # Setup custom tsc matcher, see https://github.com/actions/setup-node/issues/97
      - name: setup matchers
        run: |
          echo "::remove-matcher owner=masters::"
          echo "::add-matcher::.github/tsc.json"
          echo "::add-matcher::.github/eslint-stylish.json"

      - name: tsc
        id: tsc
        if: steps.dependencies.outcome == 'success'
        run: yarn tsc -p config/tsconfig.ci.json

  frontend-jest-tests:
    if: needs.files-changed.outputs.testable_rules_changed == 'true' || needs.files-changed.outputs.testable_modified == 'true'
    needs: [files-changed, typescript]
    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

      - uses: actions/setup-node@1e60f620b9541d16bece96c5465dc8ee9832be0b # v4
        id: setup-node
        with:
          node-version-file: '.volta.json'

      - name: node_modules cache
        uses: actions/cache@13aacd865c20de90d75de3b17ebe84f7a17d57d2 # v4.0.0
        id: nodemodulescache
        with:
          path: node_modules
          key: ${{ runner.os }}-node-modules-${{ hashFiles('yarn.lock', 'api-docs/yarn.lock', '.volta.json') }}

      - name: Install Javascript Dependencies
        if: steps.nodemodulescache.outputs.cache-hit != 'true'
        run: yarn install --frozen-lockfile

      - 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. Also, if this increases, make sure to also increase
          #      `flags.frontend.after_n_builds` in `codecov.yml`.
          CI_NODE_TOTAL: 4
          CI_NODE_INDEX: ${{ matrix.instance }}
          # Disable testing-library from printing out any of of the DOM to
          # stdout. No one actually looks through this in CI, they're just
          # going to run it locally.
          #
          # This quiets up the logs quite a bit.
          DEBUG_PRINT_LIMIT: 0
        run: |
          JEST_TESTS=$(yarn -s jest --listTests --json) yarn test-ci --forceExit

      # We only upload coverage data for FE changes since it conflicts with
      # codecov's carry forward functionality.
      # Upload coverage data even if running the tests step fails since
      # it reduces large coverage fluctuations.
      - name: Handle artifacts
        uses: ./.github/actions/artifacts
        if: always()
        with:
          files: .artifacts/coverage/*
          type: frontend
          token: ${{ secrets.CODECOV_TOKEN }}
          commit_sha: ${{ github.event.pull_request.head.sha }}

  # This check runs once all dependant jobs have passed
  # It symbolizes that all required Frontend checks have succesfully passed (Or skipped)
  # This check is the only required Github check
  frontend-required-check:
    needs: [files-changed, frontend-jest-tests, typescript]
    name: Frontend
    # This is necessary since a failed/skipped dependent job would cause this job to be skipped
    if: always()
    runs-on: ubuntu-24.04
    steps:
      # If any jobs we depend on fail, we will fail since this is a required check
      # NOTE: A timeout is considered a failure
      - name: Check for failures
        if: contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled')
        run: |
          echo "One of the dependent jobs have failed. You may need to re-run it." && exit 1