Simplify ESLint setup by using .mjs extension

- Use eslint.config.mjs instead of adding type:module to package.json
- Keep webpack.config.js and validate-fixtures-json.js as regular .js files
- No changes needed to project module system

Author: sbastn

…ithub/scripts/validate-fixtures-json.cjs .github/scripts/validate-fixtures-json.js.github/scripts/validate-fixtures-json.cjs renamed to .github/scripts/validate-fixtures-json.js .github/scripts/validate-fixtures-json.cjs renamed to .github/scripts/validate-fixtures-json.js

@@ -57,7 +57,7 @@ jobs:
       - name: Install JS Deps
         run: yarn install --frozen-lockfile
       - name: Validate JSON in HTTP fixtures
-        run: node .github/scripts/validate-fixtures-json.cjs
+        run: node .github/scripts/validate-fixtures-json.js
 
   test:
     name: Test

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ export default [
     },
   },
   {
-    files: ['webpack.config.cjs', '.github/**/*.js'],
+    files: ['webpack.config.js', '.github/**/*.js'],
     languageOptions: {
       sourceType: 'commonjs',
       globals: {

eslint.config.js eslint.config.mjseslint.config.js renamed to eslint.config.mjs

@@ -2,7 +2,6 @@
   "name": "dnsimple-developer",
   "version": "0.0.1",
   "private": true,
-  "type": "module",
   "devDependencies": {
     "@eslint/js": "^9.18.0",
     "@fortawesome/fontawesome-free": "^7.1.0",