Make babel-standalone an ESModule and enable flow (#9025)

* Make babel-standalone an ESModule and enable flow

* autogenerate plugin list

* Make config an array

scripts/utils/formatCode.js

@@ -0,0 +1,11 @@
+"use strict";
+const prettier = require("prettier");
+
+module.exports = function formatCode(code, filename) {
+  filename = filename || __filename;
+  const prettierConfig = prettier.resolveConfig.sync(filename);
+  prettierConfig.filepath = filename;
+  prettierConfig.parser = "babel";
+
+  return prettier.format(code, prettierConfig);
+};