chore(eslint): convert config to TypeScript (#413)

.vscode/settings.json

@@ -1,6 +1,10 @@
 {
     "cSpell.words": ["actioneers", "automerge", "bfra", "conventionalcommits", "Parens", "yarnpkg"],
 
+    "eslint.options": {
+        "flags": ["unstable_ts_config"]
+    },
+
     "typescript.enablePromptUseWorkspaceTsdk": true,
     "typescript.tsdk": "node_modules/typescript/lib"
 }

eslint.config.mjs → eslint.config.ts

@@ -1,32 +1,32 @@
-// @ts-check
 import eslint from '@eslint/js'
-import {defineFlatConfig} from 'eslint-define-config'
+import type {Linter} from 'eslint'
 import globals from 'globals'
 import tseslint from 'typescript-eslint'
 
 /// <reference types="@eslint-types/import" />
 /// <reference types="@eslint-types/typescript-eslint" />
 
-// @ts-expect-error - TODO: Need to cast to the return type of `tseslint.config`
-export default defineFlatConfig([
+export default tseslint.config(
+  eslint.configs.recommended,
+  ...tseslint.configs.recommendedTypeChecked,
   {
     ignores: ['**/__tests__', '**/dist', '**/lib', '**/node_modules'],
   },
-  ...tseslint.config(eslint.configs.recommended, ...tseslint.configs.recommendedTypeChecked),
 
   {
     languageOptions: {
+      ecmaVersion: 2022,
       globals: {
+        ...globals.es2021,
         ...globals.node,
       },
 
-      ecmaVersion: 2018,
-      sourceType: 'module',
-
       parserOptions: {
+        ecmaVersion: 2022,
         projectService: true,
-        tsconfigRootDir: import.meta.dirname,
+        sourceType: 'module',
       },
+      sourceType: 'module',
     },
 
     rules: {
@@ -86,4 +86,4 @@ export default defineFlatConfig([
       '@typescript-eslint/unbound-method': 'error',
     },
   },
-])
+) as Linter.Config

package.json

@@ -24,7 +24,7 @@
     "check-types": "tsc",
     "fix": "pnpm run format && pnpm run lint --fix",
     "format": "prettier --write .",
-    "lint": "eslint .",
+    "lint": "eslint --flag unstable_ts_config .",
     "test": "vitest"
   },
   "prettier": "@bfra.me/prettier-config/120-proof",
@@ -36,16 +36,15 @@
     "@bfra.me/tsconfig": "0.6.0",
     "@eslint-types/import": "2.29.1",
     "@eslint-types/typescript-eslint": "7.5.0",
-    "@eslint/eslintrc": "3.1.0",
     "@eslint/js": "9.10.0",
     "@semantic-release/git": "10.0.1",
     "@types/eslint__js": "8.42.3",
     "@types/node": "20.16.0",
     "@vercel/ncc": "0.38.1",
     "conventional-changelog-conventionalcommits": "8.0.0",
     "eslint": "9.10.0",
-    "eslint-define-config": "2.1.0",
     "globals": "15.9.0",
+    "jiti": "1.21.6",
     "js-yaml": "4.1.0",
     "prettier": "3.3.3",
     "semantic-release": "24.1.0",

tsconfig.json

@@ -1,11 +1,13 @@
 {
   "extends": "@bfra.me/tsconfig",
   "compilerOptions": {
+    "composite": false,
+    "declaration": false,
     "module": "ESNext",
     "moduleResolution": "Bundler",
     "noEmit": true,
     "target": "ESNext"
   },
   "exclude": ["dist", "node_modules", "**/*.test.ts"],
-  "include": ["src", "eslint.config.*"]
+  "include": ["src", "eslint.config.ts"]
 }