Migrate to new flat configuration system

Author: mariedm

.prettierrc.yml

@@ -5,3 +5,4 @@ semi: false
 singleQuote: true
 tabWidth: 2
 trailingComma: 'es5'
+importModuleSpecifierEnding: 'js'

.eslintrc.json eslint.config.mjs.eslintrc.json renamed to eslint.config.mjs

@@ -1,28 +1,53 @@
-{
-    "plugins": ["jest", "@typescript-eslint"],
-    "extends": ["plugin:github/recommended"],
-    "parser": "@typescript-eslint/parser",
-    "parserOptions": {
-      "ecmaVersion": 9,
-      "sourceType": "module",
-      "project": "./tsconfig.json"
+import github from 'eslint-plugin-github';
+import jestPlugin from 'eslint-plugin-jest';
+import * as tseslint from 'typescript-eslint';
+import globals from 'globals';
+
+export default [
+  // Base configurations
+  ...tseslint.configs.recommended,
+  ...tseslint.configs.stylistic,
+
+  // GitHub plugin configurations
+  github.getFlatConfigs().recommended,
+  
+  // TypeScript-specific linting configuration
+  {
+    files: ['**/*.ts'],
+    languageOptions: {
+      parser: tseslint.parser,
+      parserOptions: {
+        ecmaVersion: 2020,
+        sourceType: 'module',
+        project: './tsconfig.json'
+      },
+      globals: {
+        ...globals.node,
+        ...globals.es2015
+      }
     },
-    "rules": {
+    plugins: {
+      jest: jestPlugin,
+      '@typescript-eslint': tseslint.plugin
+    },
+    rules: {
       "i18n-text/no-en": "off",
       "eslint-comments/no-use": "off",
+      "camelcase": "off",
+      "sort-imports": "off",
+      "semi": ["error", "never"],
       "import/no-namespace": "off",
       "no-unused-vars": "off",
       "filenames/match-regex": "off",
+      "import/no-unresolved": "off",
       "@typescript-eslint/no-unused-vars": "error",
       "@typescript-eslint/explicit-member-accessibility": ["error", {"accessibility": "no-public"}],
       "@typescript-eslint/no-require-imports": "error",
       "@typescript-eslint/array-type": "error",
       "@typescript-eslint/await-thenable": "error",
       "@typescript-eslint/ban-ts-comment": "error",
-      "camelcase": "off",
       "@typescript-eslint/consistent-type-assertions": "error",
       "@typescript-eslint/explicit-function-return-type": ["error", {"allowExpressions": true}],
-      "@typescript-eslint/func-call-spacing": ["error", "never"],
       "@typescript-eslint/no-array-constructor": "error",
       "@typescript-eslint/no-empty-interface": "error",
       "@typescript-eslint/no-explicit-any": "error",
@@ -32,7 +57,6 @@
       "@typescript-eslint/no-misused-new": "error",
       "@typescript-eslint/no-namespace": "error",
       "@typescript-eslint/no-non-null-assertion": "warn",
-      "@typescript-eslint/no-unnecessary-qualifier": "error",
       "@typescript-eslint/no-unnecessary-type-assertion": "error",
       "@typescript-eslint/no-useless-constructor": "error",
       "@typescript-eslint/no-var-requires": "error",
@@ -42,16 +66,15 @@
       "@typescript-eslint/prefer-string-starts-ends-with": "error",
       "@typescript-eslint/promise-function-async": "error",
       "@typescript-eslint/require-array-sort-compare": "error",
-      "@typescript-eslint/restrict-plus-operands": "error",
-      "semi": "off",
-      "@typescript-eslint/semi": ["error", "never"],
-      "@typescript-eslint/type-annotation-spacing": "error",
-      "@typescript-eslint/unbound-method": "error",
-      "sort-imports": "off"
-    },
-    "env": {
-      "node": true,
-      "es6": true,
-      "jest/globals": true
+      "@typescript-eslint/restrict-plus-operands": "error"
+    }
+  },
+  
+  // Test files configuration
+  {
+    files: ['**/*.test.ts'],
+    languageOptions: {
+      globals: jestPlugin.environments.globals.globals
     }
-  }
+  }
+];

package.json

@@ -7,7 +7,7 @@
     "build": "tsc",
     "format": "prettier --write '**/*.ts'",
     "format-check": "prettier --check '**/*.ts'",
-    "lint": "eslint src/**/*.ts",
+    "lint": "eslint --config eslint.config.mjs src/**/*.ts",
     "package": "ncc build --source-map --license licenses.txt",
     "test": "jest",
     "all": "yarn build && yarn format && yarn lint && yarn package && yarn test"
@@ -28,22 +28,23 @@
   "dependencies": {
     "@actions/core": "1.11.1",
     "@datadog/datadog-ci": "^3.2.0",
-    "@typescript-eslint/eslint-plugin": "5",
     "axios": "^1.8.4"
   },
   "devDependencies": {
+    "@eslint/eslintrc": "^3.3.1",
     "@types/jest": "^27.4.0",
     "@types/node": "^22",
-    "@typescript-eslint/parser": "^5.48.2",
     "@vercel/ncc": "^0.38.3",
-    "eslint": "^8.46.0",
+    "eslint": "^8.57.0",
     "eslint-plugin-github": "^6.0.0",
     "eslint-plugin-jest": "^28.11.0",
     "eslint-plugin-prettier": "5.2.5",
+    "globals": "^16.0.0",
     "jest": "^27.4.7",
     "js-yaml": "^4.1.0",
     "prettier": "^3.5.3",
     "ts-jest": "^27.1.3",
-    "typescript": "^4.9.5"
+    "typescript": "^4.9.5",
+    "typescript-eslint": "^8.29.0"
   }
 }

tsconfig.json

@@ -1,7 +1,8 @@
 {
   "compilerOptions": {
     "target": "es6",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
-    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
+    "module": "commonjs",
+    "moduleResolution": "node",
     "outDir": "./lib",                        /* Redirect output structure to the directory. */
     "rootDir": "./src",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
     "strict": true,                           /* Enable all strict type-checking options. */