chore: test bun as a replacement for pnpm.

.github/workflows/presubmit.yaml

@@ -18,6 +18,7 @@ jobs:
       - uses: pnpm/action-setup@v4
         with:
           version: ^10.0.0
+      - uses: oven-sh/setup-bun@v2
       - run: node --version
       - run: ci/run_conditional_tests.sh
         name: Run unit tests

.github/workflows/windows-presubmit.yaml

@@ -11,17 +11,28 @@ jobs:
       - uses: actions/checkout@v6
         with:
           fetch-depth: 300
+      - name: Update Windows path to use Linux/MacOS compatible binaries from Git Bash
+        run: echo "C:\Program Files\Git\usr\bin" >> $GITHUB_PATH
+        shell: bash
+      - name: Check which cp is being used
+        run: where cp
+        run: echo %PATH%
+        shell: cmd
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
       - uses: pnpm/action-setup@v4
         with:
           version: ^10.0.0
+      - uses: oven-sh/setup-bun@v2
       - run: node --version
       - run: bash ci/run_conditional_tests.sh
         name: Run windows unit tests
         shell: bash
         env:
           BUILD_TYPE: presubmit
           TEST_TYPE: units
+          SHELL: C:\Program Files\Git\bin\bash.exe
+          npm_config_script_shell: bash
+

ci/run_conditional_tests.sh

@@ -61,11 +61,11 @@ set -e
 if [[ "${changed}" -eq 0 ]]; then
     echo "no change detected in ci"
 else
-    echo "skipping trigger of tests for now: tracking in #7540"
-    # echo "change detected in ci, we should test everything"
-    # echo "result of git diff ${GIT_DIFF_ARG} ci:"
-    # git diff ${GIT_DIFF_ARG} ci
-    # GIT_DIFF_ARG=""
+    #echo "skipping trigger of tests for now: tracking in #7540"
+    echo "change detected in ci, we should test everything"
+    echo "result of git diff ${GIT_DIFF_ARG} ci:"
+    git diff ${GIT_DIFF_ARG} ci
+    GIT_DIFF_ARG=""
 fi
 
 # Now we have a fixed list, but we can change it to autodetect if

ci/run_single_test.sh

@@ -40,8 +40,13 @@ if [ ${BUILD_TYPE} != "presubmit" ]; then
 fi
 
 # Install dependencies
-echo "pnpm install --ignore-scripts --engine-strict --prod; pnpm install"
-pnpm install --ignore-scripts --engine-strict --prod; pnpm install
+#
+# The filter is needed to prevent bun from installing all packages in the repo
+# from the root. By default it prefers to analyze, install, and at the root
+# so dependencies can be deduplicated. We will try that in a separate PR for
+# comparison.
+echo "bun install --ignore-scripts --prod --filter .; bun install --filter ."
+bun install --ignore-scripts --prod --filter . ; bun install --filter .
 
 
 retval=0