Make exports compatible with ES modules

[Peeja]

Node attempts to make CommonJS exports available as named exports when imported by ES modules. It does this by statically analyzing the CJS module using cjs-module-lexer. However, as the name implies, it's a lexer, not a full parser, and it only supports limited common patterns for building a module.exports object. Notably, it supports module.exports = { ... }, but only if the values in that object are all simple identifiers. Otherwise it will include only the keys up to the first non-identifier value it finds, and bail after that.

https://github.com/nodejs/cjs-module-lexer/issues/47

That means that the Generator and Wildcard exports were missing in ES modules. This change makes them available again.