Simplify babel again, workarounds no longer needed

package.json

@@ -1,6 +1,6 @@
 {
   "name": "redux-remember",
-  "version": "4.2.1",
+  "version": "4.2.2",
   "description": "Saves and loads your redux state from a key-value store of your choice",
   "author": "Iskren Slavov <[email protected]>",
   "license": "MIT",
@@ -25,8 +25,8 @@
     "clean": "rimraf -V es lib dist",
     "typecheck": "tsc --noEmit",
     "build:umd": "rollup -c ./rollup.config.ts --configPlugin rollup-plugin-ts",
-    "build:lib": "node ./babel-build.mjs lib",
-    "build:es": "node ./babel-build.mjs es",
+    "build:lib": "BABEL_ENV=lib babel --extensions '.ts' src --source-maps --out-dir lib",
+    "build:es": "BABEL_ENV=es babel --extensions '.ts' src --source-maps --out-dir es",
     "build:types": "tsc --pretty --declaration --declarationMap --emitDeclarationOnly --outDir types && rimraf -V ./types/__tests__",
     "build": "npm run build:lib && npm run build:es && npm run build:umd && npm run build:types",
     "prepare": "npm run clean && npm run typecheck && npm run test && npm run build",