feat: integrate monorepo-wide linter into CI

.github/workflows/presubmit.yaml

@@ -28,3 +28,18 @@ jobs:
         env:
           BUILD_TYPE: presubmit
           TEST_TYPE: units
+  lint:
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
+        with:
+          fetch-depth: 300
+          persist-credentials: false
+      - name: Use Node.js 18
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
+        with:
+          node-version: 18
+      - run: npm install
+      - run: npm run lint
+        name: Run monorepo linter

bin/linter.mjs

@@ -45,9 +45,7 @@ async function run() {
   } catch (err) {
     console.error('\nLinter failed:', err.message);
     // Setting exit code 1 to indicate failure. In the CI pipeline,
-    // a non-zero exit code will cause the check to fail and block the PR.
-    // Note: TypeScript (tsc) compile failures and ESLint errors (severity 2)
-    // are blocking.
+    // continue-on-error is used to ensure this does not block PRs.
     process.exitCode = 1;
   }
 }
@@ -114,27 +112,18 @@ async function checkEslint(filesToCheck) {
     }
 
     let hasBlockingErrors = false;
-    let hasFormattingErrors = false;
 
     for (const fileResult of results) {
       for (const message of fileResult.messages) {
         // message.severity === 2 indicates an error-level rule configuration.
         if (message.severity === 2) {
           hasBlockingErrors = true;
-          if (message.ruleId === 'prettier/prettier') {
-            hasFormattingErrors = true;
-          }
         }
       }
     }
 
     if (hasBlockingErrors) {
-      console.error('\n[ERROR] Blocking ESLint violations were detected. ESLint errors are blocking and must be fixed.');
-      if (hasFormattingErrors) {
-        console.log(
-          `\nTo fix formatting issues, run:\n  ./node_modules/.bin/eslint --fix ${filesToCheck.map(f => `"${f}"`).join(' ')}`,
-        );
-      }
+      console.error('\n[ERROR] ESLint violations were detected.');
       return false;
     }