3. Monorepo language detector

.github/workflows/test-language-detector.yml

@@ -0,0 +1,50 @@
+name: Test Language Detector
+
+on:
+  workflow_dispatch:
+    inputs:
+      repo:
+        description: 'Repository to test language detection on'
+        required: true
+        type: string
+        default: 'consensys/linea-monorepo'
+      languages_config:
+        description: 'Custom language config (JSON)'
+        required: false
+        type: string
+        default: ''
+
+jobs:
+  test-language-detector:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Test Language Detector Action
+        id: test-detector
+        uses: ./packages/language-detector
+        with:
+          repo: ${{ inputs.repo }}
+          languages_config: ${{ inputs.languages_config }}
+
+      - name: Show Results
+        run: |
+          echo "🎯 Language Detection Results"
+          echo "============================"
+          echo "Languages: ${{ steps.test-detector.outputs.languages }}"
+          echo
+          echo "Matrix:"
+          echo '${{ steps.test-detector.outputs.matrix }}' | jq '.'
+
+  test-scripts-directly:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Run Script Tests
+        run: |
+          cd packages/language-detector
+          chmod +x test-scripts.sh
+          ./test-scripts.sh

README.md

@@ -29,6 +29,7 @@ jobs:
 ```
 
 The workflow will:
+
 1. Auto-detect languages in your repository
 2. Load repo-specific config from `repo-configs/` (or use defaults)
 3. Run CodeQL and Semgrep scans in parallel
@@ -50,13 +51,16 @@ const config = {
       build_mode: 'manual',
       build_command: './gradlew build',
       version: '21',
-      distribution: 'temurin'
-    }
+      distribution: 'temurin',
+    },
   ],
   queries: [
     { name: 'Security queries', uses: './query-suites/base.qls' },
-    { name: 'Custom queries', uses: './custom-queries/query-suites/custom-queries.qls' }
-  ]
+    {
+      name: 'Custom queries',
+      uses: './custom-queries/query-suites/custom-queries.qls',
+    },
+  ],
 };
 
 export default config;
@@ -93,7 +97,7 @@ jobs:
     uses: metamask/security-codescanner-monorepo/.github/workflows/security-scan.yml@dev-branch
     with:
       repo: ${{ github.repository }}
-      ref: dev-branch  # Must explicitly pass the branch name
+      ref: dev-branch # Must explicitly pass the branch name
 ```
 
 **Note**: The `@branch` in the `uses:` statement only affects which workflow file is used. The `ref` input ensures all internal monorepo checkouts use the same branch.
@@ -184,6 +188,7 @@ yarn workspaces foreach run <command>
 ### Supported Languages
 
 **CodeQL:**
+
 - JavaScript/TypeScript → `javascript-typescript`
 - Python → `python`
 - Java/Kotlin → `java-kotlin`
@@ -197,43 +202,51 @@ yarn workspaces foreach run <command>
 ## 🎯 Key Features
 
 ### ✅ Automatic Language Detection
+
 - Detects languages via GitHub API
 - Maps to appropriate scanners
 - Configurable per-repository
 
 ### ✅ Optimized Execution
+
 - Parallel scanning per language
 - Matrix-based job strategy
 - Fail-fast for ignored languages
 
 ### ✅ Flexible Configuration
+
 - File-based configs (single source of truth)
 - Workflow input overrides
 - Per-language build settings
 
 ### ✅ Security First
+
 - Minimal token permissions (`contents: read`, `security-events: write`)
 - Input validation and sanitization
 - See [SECURITY.md](./SECURITY.md) for threat model
 
 ## 🔍 Troubleshooting
 
 ### Language not detected
+
 - Check GitHub's language detection (repo insights → languages)
 - Ensure language is in `LANGUAGE_MAPPING` in `language-detector/src/job-configurator.js`
 - Add manual `languages_config` in workflow input
 
 ### Build failures
+
 - Verify `build_command` in repo config
 - Check if correct `version` and `distribution` are specified
 - Review CodeQL build logs in Actions
 
 ### Config not loading
+
 - Repo config filename must match repo name: `owner/repo` → `repo.js`
 - Ensure config file exports with `export default config`
 - Check config-loader logs in workflow output
 
 ### Permissions errors
+
 - Add required permissions to calling workflow:
   ```yaml
   permissions:

packages/codeql-action/README.md

@@ -5,6 +5,7 @@ Custom CodeQL analysis action with repository-specific configurations and custom
 ## Overview
 
 This action provides flexible CodeQL scanning with:
+
 - **Automatic language detection** via GitHub API
 - **Repository-specific configurations** in `repo-configs/`
 - **Custom query suites** for specialized security analysis
@@ -21,16 +22,16 @@ The action works as part of the security scanning workflow:
 
 ## Inputs
 
-| Input | Required | Description |
-|-------|----------|-------------|
-| `repo` | ✅ | Repository name (format: `owner/repo`) |
-| `language` | ✅ | Language to scan (e.g., `javascript-typescript`, `java-kotlin`, `python`) |
-| `paths_ignored` | ❌ | Newline-delimited paths to ignore |
-| `rules_excluded` | ❌ | Newline-delimited CodeQL rule IDs to exclude |
-| `build_mode` | ❌ | Build mode: `none`, `autobuild`, or `manual` |
-| `build_command` | ❌ | Build command for `manual` build mode |
-| `version` | ❌ | Language/runtime version (e.g., `21` for Java, `3.10` for Python) |
-| `distribution` | ❌ | Distribution (e.g., `temurin`, `zulu` for Java) |
+| Input            | Required | Description                                                               |
+| ---------------- | -------- | ------------------------------------------------------------------------- |
+| `repo`           | ✅       | Repository name (format: `owner/repo`)                                    |
+| `language`       | ✅       | Language to scan (e.g., `javascript-typescript`, `java-kotlin`, `python`) |
+| `paths_ignored`  | ❌       | Newline-delimited paths to ignore                                         |
+| `rules_excluded` | ❌       | Newline-delimited CodeQL rule IDs to exclude                              |
+| `build_mode`     | ❌       | Build mode: `none`, `autobuild`, or `manual`                              |
+| `build_command`  | ❌       | Build command for `manual` build mode                                     |
+| `version`        | ❌       | Language/runtime version (e.g., `21` for Java, `3.10` for Python)         |
+| `distribution`   | ❌       | Distribution (e.g., `temurin`, `zulu` for Java)                           |
 
 ## Usage
 
@@ -87,23 +88,26 @@ const config = {
       build_mode: 'manual',
       build_command: './gradlew :coordinator:app:build',
       version: '21',
-      distribution: 'temurin'
+      distribution: 'temurin',
     },
     {
       language: 'javascript-typescript',
       // Uses default config (no build needed)
     },
     {
       language: 'cpp',
-      ignore: true  // Skip C++ scanning
-    }
+      ignore: true, // Skip C++ scanning
+    },
   ],
 
   // CodeQL query suites
   queries: [
     { name: 'Base security queries', uses: './query-suites/base.qls' },
-    { name: 'Custom queries', uses: './custom-queries/query-suites/custom-queries.qls' }
-  ]
+    {
+      name: 'Custom queries',
+      uses: './custom-queries/query-suites/custom-queries.qls',
+    },
+  ],
 };
 
 export default config;
@@ -121,45 +125,49 @@ The action includes sensible defaults for common languages:
 
 ```javascript
 const DEFAULT_CONFIGS = {
-  'javascript': { language: 'javascript-typescript' },
-  'typescript': { language: 'javascript-typescript' },
-  'python': { language: 'python' },
-  'go': { language: 'go' },
-  'java': {
+  javascript: { language: 'javascript-typescript' },
+  typescript: { language: 'javascript-typescript' },
+  python: { language: 'python' },
+  go: { language: 'go' },
+  java: {
     language: 'java-kotlin',
     build_mode: 'manual',
-    build_command: './mvnw compile'
+    build_command: './mvnw compile',
   },
-  'cpp': { language: 'cpp' },
-  'csharp': { language: 'csharp' },
-  'ruby': { language: 'ruby' }
+  cpp: { language: 'cpp' },
+  csharp: { language: 'csharp' },
+  ruby: { language: 'ruby' },
 };
 ```
 
 ## Supported Languages
 
-| GitHub Language | CodeQL Language | Build Required |
-|-----------------|-----------------|----------------|
-| JavaScript | `javascript-typescript` | No |
-| TypeScript | `javascript-typescript` | No |
-| Python | `python` | No |
-| Java | `java-kotlin` | Yes (defaults to `./mvnw compile`) |
-| Kotlin | `java-kotlin` | Yes |
-| Go | `go` | No |
-| C/C++ | `cpp` | Yes |
-| C# | `csharp` | Yes |
-| Ruby | `ruby` | No |
+| GitHub Language | CodeQL Language         | Build Required                     |
+| --------------- | ----------------------- | ---------------------------------- |
+| JavaScript      | `javascript-typescript` | No                                 |
+| TypeScript      | `javascript-typescript` | No                                 |
+| Python          | `python`                | No                                 |
+| Java            | `java-kotlin`           | Yes (defaults to `./mvnw compile`) |
+| Kotlin          | `java-kotlin`           | Yes                                |
+| Go              | `go`                    | No                                 |
+| C/C++           | `cpp`                   | Yes                                |
+| C#              | `csharp`                | Yes                                |
+| Ruby            | `ruby`                  | No                                 |
 
 ## Build Modes
 
 ### `none`
+
 No build needed (interpreted languages like JavaScript, Python)
 
 ### `autobuild`
+
 CodeQL automatically detects and runs build (works for simple projects)
 
 ### `manual`
+
 Specify exact build command:
+
 ```javascript
 {
   language: 'java-kotlin',
@@ -173,38 +181,45 @@ Specify exact build command:
 Query suites define which CodeQL queries to run:
 
 **Built-in suites:**
+
 - `./query-suites/base.qls` - Standard security queries
 - `./query-suites/linea-monorepo.qls` - Project-specific queries
 
 **Custom queries:**
+
 - Checked out from `metamask/CodeQL-Queries` repository
 - Available at `./custom-queries/query-suites/custom-queries.qls`
 
 ## Troubleshooting
 
 ### Config not loading
+
 - Filename must match repo: `owner/repo` → `repo.js`
 - Must use ESM: `export default config`
 - Check logs: `[config-loader] Loading config for repository: ...`
 
 ### Build failures
+
 - Verify `build_command` works locally
 - Check Java version matches `version` input
 - Review build step logs in Actions
 
 ### Language not detected
+
 - Check GitHub language stats (repo → Insights → Languages)
 - Add language manually via `languages_config` in repo config
 - Verify language mapping in `language-detector/src/job-configurator.js`
 
 ### SARIF upload errors
+
 - Ensure workflow has `security-events: write` permission
 - Check SARIF file is generated in `${{ steps.codeql-analysis.outputs.sarif-output }}`
 - Review CodeQL analysis logs
 
 ## Security
 
 See [SECURITY.md](../../SECURITY.md) for:
+
 - Threat model and security boundaries
 - Input validation approach
 - Token permissions model

packages/codeql-action/__tests__/config-loader.test.js

@@ -66,7 +66,10 @@ describe('config-loader', () => {
       try {
         // Write a config that will cause an error when evaluated (but is valid JS)
         const badConfigPath = path.join(tempDir, 'errorconfig.js');
-        fs.writeFileSync(badConfigPath, 'throw new Error("Config error"); export default {};');
+        fs.writeFileSync(
+          badConfigPath,
+          'throw new Error("Config error"); export default {};',
+        );
 
         const config = await loadRepoConfig('owner/errorconfig', tempDir);