chore(build): change output to es6

.npmrc

+sign-git-tag=true
+message="chore(release): bump version to %s"

tsconfig.json

 {
   "compilerOptions": {
-    "target": "ES2021",
+    "target": "ES6",
     "module": "commonjs",
     "declaration": true,
     "outDir": "./lib"