refactor: migrate to ESM

Author: vltansky

index.js

@@ -1,2 +1,5 @@
 #!/usr/bin/env node
-require("./lib/cli")(process.argv.slice(2)).catch(console.error);
+// eslint-disable-next-line import/extensions
+import cli from "./lib/cli.js";
+
+cli(process.argv.slice(2)).catch(console.error);