interface Input {
  name: string;
}
interface Output {
  value: string;
}
/* existing usages are broken
 * TS2345: Argument of type '{ name: string; }' is not assignable to parameter of type 'undefined'.
 */
const { data } = await axios.post<Output>('url', {
  name: 'hello',
});
/* Input and output have to be the same type
 * TS2345: Argument of type '{ name: string; }' is not assignable to parameter of type 'AxiosResponse<Output>'.   
 * Object literal may only specify known properties, and 'name' does not exist in type 'AxiosResponse<Output>'.
 */
const { data } = await axios.post<Input, AxiosResponse<Output>>('url', {
  name: 'hello',
});