Add typescript declaration file to package.json (#56)

* Add typescript declaration file to package.json

* chore: update index.type.ts and package.json to use .d.ts files for TypeScript declarations

index.d.ts

@@ -0,0 +1,12 @@
+declare const _default: {
+  configs: {
+    recommended: {
+      plugins: string[];
+      rules: Record<string, string>;
+    };
+    "flat/recommended": {
+      rules: Record<string, string>;
+    };
+  };
+};
+export default _default;

package.json

@@ -8,12 +8,14 @@
     ".": {
       "import": "./index.js",
       "require": "./index.cjs",
-      "default": "./index.js"
+      "default": "./index.js",
+      "types": "./index.d.ts"
     },
     "./rules": {
       "import": "./rules.js",
       "require": "./rules.cjs",
-      "default": "./rules.js"
+      "default": "./rules.js",
+      "types": "./rules.d.ts"
     }
   },
   "author": "Dunqing <dengqing0821@gmail.com>",

rules.d.ts

@@ -0,0 +1,11 @@
+export const eslintRules: Record<string, any>;
+export const typescriptRules: Record<string, any>;
+export const jestRules: Record<string, any>;
+export const unicornRules: Record<string, any>;
+export const reactRules: Record<string, any>;
+export const reactPerfRules: Record<string, any>;
+export const importRules: Record<string, any>;
+export const jsxA11yRules: Record<string, any>;
+export const nextjsRules: Record<string, any>;
+export const jsdocRules: Record<string, any>;
+export const treeShakingRules: Record<string, any>;