fix(ci): re-enable linting in CI workflow and npm scripts (#34)

- Uncomment lint step in ci.yml
- Add lint to "all" npm script
- Downgrade eslint from 9.x to 8.x for yaml config compatibility
- Remove eslint.config.js (flat config) in favor of .eslintrc.yml
- Add .eslintignore for proper file exclusions

Author: CalvinAllen

.eslintignore

@@ -0,0 +1,4 @@
+lib/
+dist/
+node_modules/
+coverage/

.github/workflows/ci.yml

@@ -37,9 +37,9 @@ jobs:
         id: npm-format-check
         run: npm run format:check
 
-      # - name: Lint
-      #   id: npm-lint
-      #   run: npm run lint
+      - name: Lint
+        id: npm-lint
+        run: npm run lint
 
       - name: Test
         id: npm-ci-test

eslint.config.js

@@ -16,7 +16,7 @@
     "package": "npx ncc build src/index.ts -o dist --source-map --license licenses.txt",
     "package:watch": "npm run package -- --watch",
     "test": "npx jest",
-    "all": "npm run format:write && npm run test && npm run coverage && npm run package"
+    "all": "npm run format:write && npm run lint && npm run test && npm run coverage && npm run package"
   },
   "engines": {
     "node": ">=21"
@@ -40,7 +40,7 @@
     "@types/node": "^22.10.1",
     "@typescript-eslint/parser": "^8.16.0",
     "@vercel/ncc": "^0.38.3",
-    "eslint": "^9.16.0",
+    "eslint": "^8.0.1",
     "eslint-plugin-github": "^5.1.3",
     "eslint-plugin-jest": "^28.9.0",
     "jest": "^29.7.0",