feat(ci): compile only shard-assigned packages in unit test shards

.github/actions/check-shard-status/action.yaml

@@ -15,6 +15,7 @@ runs:
             owner: context.repo.owner,
             repo: context.repo.repo,
             run_id: context.runId,
+            per_page: 100,
           });
           const nodeVersion = '${{ inputs.node-version }}';
           const shardJobs = jobs.filter(j => j.name.includes(`units (Node ${nodeVersion},`));

.github/actions/run-unit-tests/action.yaml

@@ -22,12 +22,10 @@ runs:
       uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
       with:
         path: .turbo
-        key: ${{ runner.os }}-turbo-${{ github.sha }}
+        key: ${{ runner.os }}-turbo-shard-${{ inputs.shard-index }}-${{ github.sha }}
         restore-keys: |
+          ${{ runner.os }}-turbo-shard-${{ inputs.shard-index }}-
           ${{ runner.os }}-turbo-
-    - name: Compile Workspace (Turborepo Caching)
-      run: pnpm run compile || pnpm run compile
-      shell: bash
     - run: node --version
       shell: bash
     - name: Run unit tests

.github/workflows/presubmit-bun.yml

@@ -47,11 +47,10 @@ jobs:
         uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
         with:
           path: .turbo
-          key: ${{ runner.os }}-turbo-${{ github.sha }}
+          key: ${{ runner.os }}-turbo-shard-${{ matrix.shard-index }}-${{ github.sha }}
           restore-keys: |
+            ${{ runner.os }}-turbo-shard-${{ matrix.shard-index }}-
             ${{ runner.os }}-turbo-
-      - name: Compile Workspace (Turborepo Caching)
-        run: pnpm run compile
       - uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2.2.0
         with:
           bun-version: ${{ matrix.bun-version }}

.github/workflows/presubmit.yaml

@@ -57,7 +57,13 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-turbo-
       - name: Compile Workspace (Turborepo Caching)
-        run: pnpm run compile
+        run: |
+          # Skip pnpm run compile in the lint job when no .ts files changed
+          if [ -n "$(git diff --name-only --diff-filter=ACMRT HEAD^1...HEAD -- '*.ts')" ]; then
+            pnpm run compile
+          else
+            echo "No TypeScript files changed in HEAD^1...HEAD; skipping workspace compile for linter."
+          fi
       - run: node ./bin/linter.mjs --strict
         name: Run monorepo linter
         env:

ci/run_conditional_tests.sh

@@ -151,8 +151,9 @@ windows_exempt_tests="core/ core/packages/ core/dev-packages/ .github/scripts/fi
 # Gather all test directories into an array
 test_dirs=()
 
-for subdir in ${subdirs[@]}; do
-    for d in `ls -d ${subdir}/*/`; do
+for subdir in "${subdirs[@]}"; do
+    for d in "${subdir}"/*/; do
+        [[ -d "$d" ]] || continue
         if [ -s "ignore.json" ] && jq -e ".ignored[] | select(. == \"$d\")" ignore.json > /dev/null 2>&1; then
             echo "Skipping ${d} (explicitly ignored in ignore.json)"
             continue
@@ -191,10 +192,10 @@ for subdir in ${subdirs[@]}; do
         fi
 
         # Our CI uses Git Bash on Windows to execute this script, which returns "msys" or "cygwin" for OSTYPE.
-        if [[ "$OSTYPE" == "msys" || "$OSTYPE" == "cygwin" || "$OS" == "Windows_NT" ]]; then
+        if [[ "$OSTYPE" == "msys"* || "$OSTYPE" == "cygwin"* || "$OS" == "Windows_NT" ]]; then
             is_exempt=false
             for exempt in ${windows_exempt_tests}; do
-                if [[ "${d}" == "${exempt}" || "${d}" == "${exempt}/"* ]]; then
+                if [[ "${d}" == "${exempt}" || "${d}" == "${exempt%/}/"* ]]; then
                     is_exempt=true
                     break
                 fi
@@ -305,15 +306,37 @@ if [[ "${RUN_TESTS_MODE}" == "CALCULATE_SHARD_MATRIX" ]]; then
 fi
 
 # If SHARD_TOTAL and SHARD_INDEX are provided, we will only run a subset of the tests.
+shard_dirs=()
 for i in "${!test_dirs[@]}"; do
-    d="${test_dirs[$i]}"
-
     if [[ -n "${SHARD_TOTAL}" && -n "${SHARD_INDEX}" ]]; then
         if (( SHARD_TOTAL > 0 && i % SHARD_TOTAL != SHARD_INDEX )); then
             continue
         fi
     fi
+    shard_dirs+=("${test_dirs[$i]}")
+done
+
+# Batch-compile only the packages assigned to this shard (plus their upstream
+# workspace dependencies via `^compile` in `turbo.json`) before running the test loop.
+if (( ${#shard_dirs[@]} > 0 )); then
+    if [ ! -d "${PROJECT_ROOT}/node_modules/.pnpm" ]; then
+        echo "Installing workspace dependencies at ${PROJECT_ROOT}..."
+        pnpm --dir "${PROJECT_ROOT}" install --frozen-lockfile --ignore-scripts
+    fi
+
+    turbo_filters=()
+    for d in "${shard_dirs[@]}"; do
+        turbo_filters+=("--filter={./${d%/}}")
+    done
+    echo "Compiling ${#shard_dirs[@]} package(s) assigned to this shard..."
+    run_turbo() {
+        pnpm --dir "${PROJECT_ROOT}" exec turbo run compile "${turbo_filters[@]}" "$@"
+    }
+    # Run turbo with fallback concurrency
+    run_turbo --concurrency=4 || run_turbo --concurrency=2
+fi
 
+for d in "${shard_dirs[@]}"; do
     echo "running test in ${d}"
     pushd "${d}" >/dev/null
     # Temporarily allow failure.