Regression in 10.0.1: copySync is nolonger accessible in ESM mode

[akphi]

I think the change in #922 broke the importing of copySync in ESM mode a bit. The error is below

import { mkdirs, copySync } from 'fs-extra';
                 ^^^^^^^^
SyntaxError: Named export 'copySync' not found. The requested module 'fs-extra' is a CommonJS module, which may not support all module.exports as named exports.
CommonJS modules can always be imported via the default export, for example using:

import pkg from 'fs-extra';
const { mkdirs, copySync } = pkg;

This did not happen in 10.0.0.

• Operating System: macOS 11.6.4
• Node.js version: 16.8.0
• fs-extra version: 10.0.1

[akphi]

@RyanZim Reading #746 and it seems like I was lucky to be able to use fs-extra in this ESM-like fashion so far... Let me know what you think, I'm happy to close this if you confirm this is totally by accident and we should avoid using this ESM-like approach till #746 is resolved. Thanks!

[RyanZim]

Yeah, we've never supported ESM; I surprised that ever worked.