TypeScript and Node https.get()

Question

I'm starting to convert a project to TypeScript and I'm encountering an error I'm not sure how to solve.

When I write:

https.get(`someUrl`, resp => {
  // Define Buffer
  let buffer = '';
  // Fill buffer
  resp.on('')
});

It gives me

[ts] Parameter 'resp' implicitly has an 'any' type. [7006]

I know I can 'fix' it by changing

https.get(`someUrl`, resp => {

to

https.get(`someUrl`, (resp: Object) => {

Is this the correct solution? Also, TS has no idea what resp actually contains. When I write normal JS it just shows me what methods and props there are but with TS I get nothing. When I get to resp.on('') it tells me that on does not exist on Object . Is this expected or am I doing something wrong? Do I need to write an interface for the https.get function?

I'm using Visual Studio Code

Is it because I'm using a module that is not intended to be used with TS? I think it could be simply that.

Answer 1

It base on the https.get callback function parameter type. Usually it need to be define either on the resp type or on the function type, so let say you create a type T, which you expect to get from the request

type ResponseType = { data: any };

then you can add to the function call like

https.get<ResponseType>(...);

or

https.get(`someUrl`, (resp: ResponseType) => {...}

Object type is quite flexible and it won't show if you use a property that is not existing in the response type. so I won't use that unless there're no other choices