Update TypeScript typings with generic type parameters

[d-fischer]

This aims to fix #718.
I know there's already an effort to fix this in #730. However, this PR differs in a few ways:

• Rather than creating a new type that people would have to explicitly use in their variable declarations or as a cast, it adds an optional generic type parameter to AxiosPromise and AxiosResponse as well as AxiosInstance.get and similar methods. All instances of these new type parameters default to any, so backwards compatibility is ensured. If users want to add a type to the response data, they can do it using get<MyType>(...), and if they don't, they just keep their code as is and it still works the same.
• It includes tests.

[coveralls]

Coverage remained the same at 93.812% when pulling b0dccc6 on d-fischer:ts-generic-response into 07a7b7c on mzabriskie:master.

[jonlambert]

Has there been any movement on this? Currently using a basic wrapper around axios to get similar functionality but would be great to be able to do this natively 🎉

[nickuraltsev]

@d-fischer Thank you!

[psachs21]

@nickuraltsev any idea when the next release will be? Looking to use these new typings.

[nickuraltsev]

@psachs21 Hopefully, this weekend

[psachs21]

Awesome!

…

On Fri, Oct 20, 2017 at 11:03 AM, Nick Uraltsev ***@***.***> wrote: @psachs21 <https://github.com/psachs21> Hopefully, this weekend — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#1061 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AK61gD5EBfvqq2fES7-csUVOo-J_-Lm7ks5suLZSgaJpZM4PGbNr> .

[christopher1986]

I don't know if this is desired behaviour but when using async/await my IDE (IntelliJ) indicates that response is a User object. In the second example everything works as expected and reponse is a AxiosPromise<User> object.

Maybe I am doing something wrong but I would have expected that async/await would also return a AxiosPromise object.

import axios from 'axios';

async function asyncBroken() {
    const response = await axios.get<User>.get('http://localhost/users');
    response.data // Unresolved variable data here because User is inferred.
}

function getUsers() {
    axios.get<User>.get('http://localhost/users').then((response) => resonse.data);
}

[A1vinSmith]

(res: AxiosResponse)