Restructure CI to prepare for required checks and merge queues

.github/workflows/ci.yml

@@ -9,6 +9,10 @@ on:
     branches:
       - main
       - release-*
+  merge_group:
+    branches:
+      - main
+      # - release-*
 
 permissions:
   contents: read
@@ -24,43 +28,107 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os:
-          - ubuntu-latest
-          - windows-latest
-          - macos-latest
-        node-version:
-          - '22'
-          - '20'
-          - '18'
-          - '16'
-          - '14'
-        bundle:
-          - 'true'
-        include:
-          - node-version: 'lts/*'
+        config:
+          # Main builds
+          - os: ubuntu-latest
+            node-version: '24'
+            bundle: true
+
+          # Other builds (skipped in merge queues)
+          - os: windows-latest
+            node-version: '24'
+            bundle: true
+            skip: ${{ github.event_name == 'merge_group' }}
+          - os: macos-latest
+            node-version: '24'
+            bundle: true
+            skip: ${{ github.event_name == 'merge_group' }}
+          - os: ubuntu-latest
+            node-version: '22'
+            bundle: true
+          - os: windows-latest
+            node-version: '22'
+            bundle: true
+            skip: ${{ github.event_name == 'merge_group' }}
+          # Skip macOS for this version; resources are limited.
+          # - os: macos-latest
+          #   node-version: '22'
+          #   bundle: true
+          #   skip: ${{ github.event_name == 'merge_group' }}
+          - os: ubuntu-latest
+            node-version: '20'
+            bundle: true
+          - os: windows-latest
+            node-version: '20'
+            bundle: true
+            skip: ${{ github.event_name == 'merge_group' }}
+          # Skip macOS for this version; resources are limited.
+          # - os: macos-latest
+          #   node-version: '20'
+          #   bundle: true
+          #   skip: ${{ github.event_name == 'merge_group' }}
+          - os: ubuntu-latest
+            node-version: '18'
+            bundle: true
+          - os: windows-latest
+            node-version: '18'
+            bundle: true
+            skip: ${{ github.event_name == 'merge_group' }}
+          # Skip macOS for this version; resources are limited.
+          # - os: macos-latest
+          #   node-version: '18'
+          #   bundle: true
+          #   skip: ${{ github.event_name == 'merge_group' }}
+          - os: ubuntu-latest
+            node-version: '16'
+            bundle: true
+          - os: windows-latest
+            node-version: '16'
+            bundle: true
+            skip: ${{ github.event_name == 'merge_group' }}
+          - os: macos-latest
+            node-version: '16'
+            bundle: true
+            skip: ${{ github.event_name == 'merge_group' }}
+          - os: ubuntu-latest
+            node-version: '14'
+            bundle: true
+            skip: ${{ github.event_name == 'merge_group' }}
+          - os: windows-latest
+            node-version: '14'
+            bundle: true
+            skip: ${{ github.event_name == 'merge_group' }}
+          # No Node 14 on ARM macOS
+          # - os: macos-latest
+          #   node-version: '14'
+          #   bundle: true
+          #   skip: ${{ github.event_name == 'merge_group' }}
+
+          - os: ubuntu-latest
+            node-version: 'lts/*'
             bundle: false
-            os: ubuntu-latest
+            skip: ${{ github.event_name == 'merge_group' }}
+
         exclude:
-          # No Node 14 on ARM macOS
-          - node-version: '14'
-            os: macos-latest
+          - config:
+              skip: true
 
-    runs-on: ${{ matrix.os }}
-    name: Test Node ${{ matrix.node-version }} on ${{ matrix.os }}${{ (!matrix.bundle && ' with --no-bundle') || '' }}
+    runs-on: ${{ matrix.config.os }}
+    name: Test Node ${{ matrix.config.node-version }} on ${{ matrix.config.os }}${{ (!matrix.config.bundle && ' with --no-bundle') || '' }}
 
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-      - name: Use node version ${{ matrix.node-version }}
+      - name: Use node version ${{ matrix.config.node-version }}
         uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
-          node-version: ${{ matrix.node-version }}
+          node-version: ${{ matrix.config.node-version }}
           check-latest: true
       - run: npm ci
 
       - name: Tests
         id: test
         # run tests, but lint separately
-        run: npm run test -- --no-lint --bundle=${{ matrix.bundle }}
+        run: npm run test -- --no-lint --bundle=${{ matrix.config.bundle }}
 
       - name: Print baseline diff on failure
         if: ${{ failure() && steps.test.conclusion == 'failure' }}
@@ -70,6 +138,8 @@ jobs:
           git diff --staged --exit-code
 
   coverage:
+    if: ${{ github.event_name != 'merge_group' }}
+
     runs-on:
       - 'self-hosted'
       - '1ES.Pool=TypeScript-1ES-GitHub-Large'
@@ -294,6 +364,8 @@ jobs:
         run: npx hereby build-src --built
 
   baselines:
+    if: ${{ github.event_name != 'merge_group' }}
+
     runs-on: ubuntu-latest
 
     steps:
@@ -338,3 +410,27 @@ jobs:
         with:
           name: fix_baselines.patch
           path: fix_baselines.patch
+
+  required:
+    runs-on: ubuntu-latest
+    if: ${{ always() }}
+    needs:
+      - test
+      - coverage
+      - lint
+      - knip
+      - format
+      - browser-integration
+      - typecheck
+      - smoke
+      - package-size
+      - misc
+      - self-check
+      - baselines
+
+    steps:
+      - name: Check required jobs
+        env:
+          NEEDS: ${{ toJson(needs) }}
+        run: |
+          ! echo $NEEDS | jq -e 'to_entries[] | { job: .key, result: .value.result } | select((.result == "success" or .result == "skipped") | not)'