How to typehint promises in typescript

I currently have the following code

  authenticate(credentials: AuthenticationCredentials): Promise<void> {
    return axios
      .post('backend://authentication', credentials)
      .then<void>(response => {
        this.processToken(response.data.token);
      });
  }

The error it produces

Type 'Promise<void>' is not assignable to type 'Promise<void>'.
  Types of property 'then' are incompatible.
    Type '{ <R1, R2>(onFulfilled: (value: void) => R1 | Promise<R1>, onRejected: (error: any) => R2 | Promi...' is not assignable to type '{ <TResult1, TResult2>(onfulfilled: (value: void) => TResult1 | PromiseLike<TResult1>, onrejected...'.
      Type 'Promise<any>' is not assignable to type 'Promise<any>'.
        Types of property 'then' are incompatible.
          Type '{ <R1, R2>(onFulfilled: (value: any) => R1 | Promise<R1>, onRejected: (error: any) => R2 | Promis...' is not assignable to type '{ <TResult1, TResult2>(onfulfilled: (value: any) => TResult1 | PromiseLike<TResult1>, onrejected:...'.

[nickuraltsev]

Fixed via 3704d57

[vileen]

This worked for me:

import axios, {AxiosPromise} from 'axios';

function get(): AxiosPromise {
  return axios.get('http://my.domain/api');
}

but you don’t specify the exact type returned by AxiosResponse so it’s any implicitly