[backend] chore: eslint + Prettier (#39)

* [backend] chore: eslint + Prettier

.github/workflows/backend-lint.yml

@@ -0,0 +1,29 @@
+name: Backend Linting
+
+on:
+  pull_request:
+    branches: ["main"]
+    paths:
+      - "backend/**"
+
+defaults:
+  run:
+    working-directory: ./backend
+
+jobs:
+    eslint:
+        name: Run eslint scanning
+        runs-on: ubuntu-latest
+        permissions:
+            contents: read
+            security-events: write
+            actions: read # only required for a private repository by github/codeql-action/upload-sarif to get the Action run status
+        steps:
+            - name: Checkout code
+              uses: actions/checkout@v3
+
+            - name: Install packages
+              run: npm ci
+
+            - name: Run ESLint
+              run: npm run lint

.github/workflows/frontend-service-tests.yml

@@ -3,6 +3,9 @@ name: Frontend Service Tests - Playwright
 on:
   pull_request:
     branches: [ "main" ]
+    paths:
+      - "playwright/**"
+      - "frontend/**"
 
 jobs:
   build:

backend/.prettierrc.json

@@ -0,0 +1,13 @@
+{
+  "printWidth": 80,
+  "tabWidth": 2,
+  "useTabs": false,
+  "semi": true,
+  "singleQuote": true,
+  "trailingComma": "es5",
+  "bracketSpacing": true,
+  "jsxSingleQuote": false,
+  "arrowParens": "always",
+  "htmlWhitespaceSensitivity": "strict",
+  "endOfLine": "lf"
+}

backend/eslint.config.mjs

@@ -0,0 +1,30 @@
+import globals from 'globals';
+import pluginJs from '@eslint/js';
+import tseslint from 'typescript-eslint';
+import eslintPluginPrettierRecommended from 'eslint-plugin-prettier/recommended';
+
+export default [
+  {
+    files: ['**/*.js'],
+    languageOptions: { sourceType: 'script' },
+  },
+  { languageOptions: { globals: globals.browser } },
+  pluginJs.configs.recommended,
+  {
+    rules: {
+      "no-empty-pattern": ["error", { allowObjectPatternsAsParameters: true }],
+    },
+  },
+  ...tseslint.configs.recommended,
+  {
+    ignores: [
+      '**config**',
+      'scripts/*',
+      'dist/*',
+      'build/*',
+      'coverage/*',
+      'node_modules/*',
+    ],
+  },
+  eslintPluginPrettierRecommended,
+];