feat: Add ESLint + ts-prune + depcheck to CI (#32) - Add GitHub Actions workflow, configure linting tools, clean up unused exports, all tools now pass

.depcheckrc

@@ -0,0 +1,36 @@
+# Copyright IBM Corp. 2025
+# Assisted by CursorAI
+
+# Ignore these dependencies that are used but not detected by depcheck
+ignores:
+  # VSCode API is imported as 'vscode' but the package is '@types/vscode'
+  - "vscode"
+  # React dependencies used in webview libs (external bundles, not npm dependencies)
+  - "react"
+  - "@graphiql/react"
+  # Test runner used by vscode-test command but not directly imported
+  - "@vscode/test-electron"
+  # Depcheck itself is used via npx in scripts
+  - "depcheck"
+
+# Ignore these patterns - webview libs are bundled separately
+ignorePatterns:
+  - "webview/**"
+  - "dist/**"
+  - "out/**"
+  - "*.vsix"
+
+# Skip missing dependencies check for known false positives
+skipMissing: false
+
+# Custom parsers for different file types
+parsers:
+  "**/*.ts": "typescript"
+  "**/*.js": "es6"
+  "**/*.mjs": "es6"
+
+# Detectors to use
+detectors:
+  - "requireCallExpression"
+  - "importDeclaration"
+  - "exportDeclaration"

.github/workflows/lint.yml

@@ -0,0 +1,43 @@
+# Copyright IBM Corp. 2025
+# Assisted by CursorAI
+
+name: Lint
+
+on:
+  push:
+    branches: [main, develop]
+  pull_request:
+    branches: [main, develop]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [18.x, 20.x]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: "npm"
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run ESLint
+        run: npm run lint
+
+      - name: Check for unused exports with ts-prune
+        run: npm run lint:prune
+
+      - name: Check for unused dependencies with depcheck
+        run: npm run lint:deps
+
+      - name: Run type checking
+        run: npm run check-types

package.json

@@ -125,11 +125,15 @@
     "check-types": "tsc --noEmit",
     "lint": "eslint src",
     "lint:prune": "ts-prune --error",
+    "lint:deps": "depcheck",
+    "lint:all": "npm run lint && npm run lint:prune && npm run lint:deps",
+    "ci:lint": "npm run lint && npm run lint:prune && npm run lint:deps && npm run check-types",
     "test": "vscode-test"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
     "@types/node": "20.x",
+    "@types/sinon": "^17.0.3",
     "@types/vscode": "^1.100.0",
     "@typescript-eslint/eslint-plugin": "^8.31.1",
     "@typescript-eslint/parser": "^8.31.1",
@@ -138,7 +142,9 @@
     "depcheck": "^1.4.7",
     "esbuild": "^0.25.3",
     "eslint": "^9.25.1",
+    "mocha": "^10.8.2",
     "npm-run-all": "^4.1.5",
+    "sinon": "^19.0.2",
     "ts-prune": "^0.10.3",
     "typescript": "^5.8.3"
   },

readme.md

@@ -135,6 +135,38 @@ npm run compile
 npm run watch
 ```
 
+### Code Quality & Linting
+
+This project uses multiple linting tools to ensure code quality:
+
+```bash
+# Run ESLint for code style and best practices
+npm run lint
+
+# Check for unused TypeScript exports
+npm run lint:prune
+
+# Check for unused dependencies
+npm run lint:deps
+
+# Run type checking
+npm run check-types
+
+# Run all linting tools (used in CI)
+npm run ci:lint
+```
+
+**CI Integration**: All linting tools run automatically in GitHub Actions on every push and pull request. The CI will fail if any of these tools report issues:
+
+- **ESLint** - Enforces code style, prevents console statements, ensures proper imports
+- **ts-prune** - Finds unused exports to keep the codebase clean
+- **depcheck** - Identifies unused dependencies and missing dependencies
+
+Configuration files:
+- ESLint: `eslint.config.mjs`
+- depcheck: `.depcheckrc`
+- TypeScript: `tsconfig.json`
+
 ### Testing
 
 The extension uses the standard VS Code testing framework with Mocha. The tests are located in the `src/test` directory. View the README.md file in that directory for more details.

src/extension.ts

@@ -19,18 +19,6 @@ export let EXTENSION_URI: vscode.Uri;
 export let runtimeDiag: vscode.DiagnosticCollection;
 
 
-/**
- * Gets or creates a terminal for StepZen operations
- * @param name The name to give the terminal if creating a new one
- * @returns An existing or newly created terminal instance
- */
-export function getOrCreateStepZenTerminal(name: string = UI.TERMINAL_NAME): vscode.Terminal {
-  if (!stepzenTerminal) {
-    stepzenTerminal = vscode.window.createTerminal(name);
-  }
-  return stepzenTerminal;
-}
-
 /**
  * Resolve the workspace folder that owns the given URI (or the active editor if none supplied).
  */