Better promise supports with `unwrap` property.

[arthurfiorette]

A while ago I submitted this, but it certainly don't work for custom promises or classes that extends promises... A simple example of that is Prisma itself that uses a custom Promise type to add better intellisense.

function test() {
  return prisma.user.findFirst();
}

// this don't work because we cannot infer `Prisma.Prisma__UserClient` as a promise type.
export const user = test();

*****
async function test() {
  return prisma.user.findFirst();
}

// this works because the async function transforms the `Prisma.Prisma__UserClient` into a `Promise` type.
export const user = test();

Which is very hard to debug and find out the problem, as no error at compile time is thrown.

To solve this and other problems, what about adding a unwrap property which would do exactly what it says:

{
  "unwrap": ["Promise", "ExampleGenericType"] // defaults to only Promise
}

type ExampleGenericType<A,B,C> = ... /* multiple generics  */

const test1: Promise<number>
// would result into number json array type.

const test2: ExampleGenericType<number, string, boolean>
// would result in a [number, string, boolean] tuple json array type.

const test3: ExampleGenericType<number>
// would result in a number json array type.

Of course this is a more open approach and you may not want it, in that case, what about just a promiseTypes: string[] property to add more promise types?