fix: support for generic functions

[arthurfiorette]

Previously, functions like:

function fn<A>(a: A) {
  return { a }
}

const result = fn(1)
//             ^ throws 

would throw even when not in use because it would parse the function without a reference to each parameter on their respective call, since A is generic but in the case of fn(1), A is number.

I added some extra security checks to avoid undefined errors being thrown without extra information about the actual node.

📦 Published PR as canary version: 2.3.1--canary.2159.782ac82.0

✨ Test out this PR locally via:

npm install [email protected]
# or 
yarn add [email protected]

[arthurfiorette]

Probably continuation of #1978

[domoritz]

Tests are failing but overall looks reasonable.