Add lint

Signed-off-by: Xuanwo <github@xuanwo.io>

.eslintrc.json

@@ -0,0 +1,32 @@
+{
+    "env": {
+        "node": true,
+        "jest": true
+    },
+    "parser": "@typescript-eslint/parser",
+    "parserOptions": {
+        "ecmaVersion": 2020,
+        "sourceType": "module"
+    },
+    "extends": [
+        "eslint:recommended",
+        "plugin:@typescript-eslint/eslint-recommended",
+        "plugin:@typescript-eslint/recommended",
+        "plugin:import/errors",
+        "plugin:import/warnings",
+        "plugin:import/typescript",
+        "plugin:prettier/recommended"
+    ],
+    "plugins": [
+        "@typescript-eslint",
+        "simple-import-sort",
+        "jest"
+    ],
+    "rules": {
+        "import/first": "error",
+        "import/newline-after-import": "error",
+        "import/no-duplicates": "error",
+        "simple-import-sort/imports": "error",
+        "sort-imports": "off"
+    }
+}

.github/workflows/CI.yml

@@ -12,12 +12,29 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 
-name: Test sccache
+name: CI
 
 on: [push, pull_request]
 
 jobs:
-  v0_3_3:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Setup Node.js 16.x
+        uses: actions/setup-node@v3
+        with:
+          node-version: 16.x
+          cache: npm
+      - name: Prettier Format Check
+        run: npm run format-check
+      - name: ESLint Check
+        run: npm run lint
+      - name: Build & Test
+        run: npm run test
+
+  test_v0_3_3:
     name: Test version 0.3.3
     runs-on: ${{ matrix.os }}
     strategy:
@@ -35,6 +52,7 @@ jobs:
         uses: actions/setup-node@v3
         with:
           node-version: 16.x
+          cache: npm
 
       - name: npm install
         run: npm install

.gitignore

@@ -1,2 +1,4 @@
 node_modules/
 lib/
+# Cache file of eslint
+.eslintcache

package.json

@@ -9,6 +9,7 @@
     "build": "prettier --write **/*.ts && tsc && ncc build lib/sccache.js",
     "format": "prettier --write **/*.ts",
     "format-check": "prettier --check **/*.ts",
+    "lint": "eslint **/*.ts --cache",
     "test": "jest"
   },
   "repository": {
@@ -37,6 +38,13 @@
     "jest-circus": "^29.3.1",
     "prettier": "^2.8.1",
     "ts-jest": "^27.1.4",
-    "typescript": "^4.9.4"
+    "typescript": "^4.9.4",
+    "@typescript-eslint/eslint-plugin": "^5.45.0",
+    "@typescript-eslint/parser": "^5.45.0",
+    "eslint-config-prettier": "^8.5.0",
+    "eslint-plugin-import": "^2.26.0",
+    "eslint-plugin-jest": "^26.9.0",
+    "eslint-plugin-prettier": "^4.2.1",
+    "eslint-plugin-simple-import-sort": "^7.0.0"
   }
 }

src/sccache.ts

@@ -35,7 +35,7 @@ async function setup() {
   // Download and extract.
   const sccachePackage = await downloadTool(downloadUrl);
 
-  var sccachePath;
+  let sccachePath;
   if (getExtension() == 'zip') {
     sccachePath = await extractZip(sccachePackage);
   } else {