check.yml

# The merge gate. `bun run check` is what the repository already calls the gate
# (AGENTS.md); this only makes it run where nobody can forget to.
#
# The gate is split across parallel jobs because it was one sequential run
# where the slowest step held every other step behind it. The steps are
# independent processes sharing no state. Keep this matrix and the `check:*`
# shards `bun run check` names in step.
name: check

# Automatic triggers are off on this branch while the Actions account is
# unbilled — every run died at runner provisioning. Still runnable by hand.
on:
  workflow_dispatch:

concurrency:
  group: check-${{ github.ref }}
  cancel-in-progress: true

jobs:
  shard:
    name: check (${{ matrix.shard }})
    runs-on: ubuntu-latest
    timeout-minutes: 30
    strategy:
      # One shard's failure should not hide the others' results.
      fail-fast: false
      matrix:
        shard: [static, build]
    steps:
      - uses: actions/checkout@v5
      - uses: oven-sh/setup-bun@v2
        with:
          bun-version: 1.4.0
      - uses: actions/cache@v4
        with:
          path: ~/.bun/install/cache
          key: bun-${{ runner.os }}-${{ hashFiles('bun.lock') }}
      # An optimisation, not a correctness boundary: `vendor-build` rebuilds a
      # restored tree its digest disagrees with. Every shard shares the key, so
      # a miss has each rebuild only what moved and offer a save the cache keeps
      # once — cheaper than a serial build job in front of every run.
      - uses: actions/cache@v4
        with:
          path: vendor/interchange/packages/*/dist
          key: >-
            vendor-dist-${{ runner.os }}-${{ hashFiles('vendor/interchange/VENDORED_REVISION',
            'scripts/vendor-build.ts', 'vendor/interchange/bin/dist-rewrite.ts',
            'vendor/interchange/packages/*/src/**') }}
          restore-keys: vendor-dist-${{ runner.os }}-
      # postinstall builds the vendored Interchange packages.
      - run: bun install --frozen-lockfile
      - run: bun run check:${{ matrix.shard }}

  # The single required status check: green only when every shard is.
  check:
    name: check
    needs: shard
    if: always()
    runs-on: ubuntu-latest
    steps:
      - name: Every shard passed
        if: needs.shard.result != 'success'
        run: |
          echo "::error::the check matrix did not pass (${{ needs.shard.result }})"
          exit 1