fix: don't expose incorrect ESM entry in exports (#70)

Author: haoqunjiang

package.json

@@ -12,8 +12,9 @@
   "types": "lib/index.d.ts",
   "exports": {
     ".": {
-      "import": "./lib/index.esm.js",
-      "require": "./lib/index.cjs.js"
+      "require": "./lib/index.cjs.js",
+      "node": "./lib/index.cjs.js",
+      "browser": "./lib/index.esm.js"
     },
     "./*": "./*"
   },