Fix esm build

Author: cmdcolin

package.json

@@ -28,7 +28,7 @@
     "lint": "eslint --report-unused-disable-directives --max-warnings 0",
     "clean": "rimraf dist esm",
     "format": "prettier --write .",
-    "build:esm": "tsc --outDir esm",
+    "build:esm": "tsc --module nodenext --moduleResolution nodenext --outDir esm",
     "build:es5": "tsc --module commonjs --outDir dist",
     "build": "yarn build:esm && yarn build:es5",
     "prebuild": "yarn clean",