More patterns for named exports

[arv]

I'm currently using https://www.npmjs.com/package/text-encoding which does:

module.exports = {
  TextEncoder: encoding.TextEncoder,
  TextDecoder: encoding.TextDecoder,
};

And therefore the named exports are not identified:

Module .../node_modules/text-encoding/index.js does not export TextDecoder (imported by ...)

[Victorystick]

Tiny pieces of code like this should be easy to statically analyse and optimise. We should look into it.