feat: add ESM version (#144)

Author: sxzz

package.json

@@ -3,6 +3,7 @@
   "version": "1.7.0",
   "description": "Provide a defineConfig function for .eslintrc.js files",
   "main": "src/index.js",
+  "module": "src/index.mjs",
   "scripts": {
     "clean": "rm -Rf dist pnpm-lock.yaml node_modules",
     "check": "tsc",

src/index.mjs

@@ -0,0 +1,9 @@
+/**
+ * Define an eslint config.
+ *
+ * @param config Eslint config.
+ * @returns Eslint config.
+ */
+export function defineConfig(config) {
+  return config;
+}