Add TypeScript types (#2382)

index.d.ts

@@ -0,0 +1,12 @@
+import type {ESLint, Linter} from 'eslint';
+
+declare const eslintPluginUnicorn: ESLint.Plugin & {
+	configs: {
+		recommended: Linter.Config;
+		all: Linter.Config;
+		'flat/all': Linter.FlatConfig;
+		'flat/recommended': Linter.FlatConfig;
+	};
+};
+
+export = eslintPluginUnicorn;

package.json

@@ -11,6 +11,7 @@
 		"url": "https://sindresorhus.com"
 	},
 	"main": "index.js",
+	"types": "index.d.ts",
 	"sideEffects": false,
 	"engines": {
 		"node": ">=18.18"
@@ -35,6 +36,7 @@
 	},
 	"files": [
 		"index.js",
+		"index.d.ts",
 		"rules",
 		"configs"
 	],