How can I cast response.body to the type of options.responseType argument? TypeScript playground
The code block bellow is a simplified version of my code... many more options exist.
import got from "got"
interface Options {
responseType?: "buffer" | "json"
}
const get = async (url: string, options?: Options) => {
let response = await got.get(url, {
responseType: options?.responseType ?? "json"
})
return response.body
}
The simplest solution would be to use overloads:
import got from "got"
interface Options {
responseType?: "buffer" | "json"
}
async function get (url: string, options: Options & { responseType: "buffer" }) : Promise<Buffer>
async function get(url: string, options: Options & { responseType: "json" }): Promise<object>
async function get(url: string, options?: Options): Promise<unknown>
async function get (url: string, options?: Options) {
let response = await got.get(url, {
responseType: options?.responseType
})
return response.body
}
let buffer = get("", { responseType: "buffer"})
let object = get("", { responseType: "json" })
let unknown = get("")
Use generics T
import got from "got";
type ResponseType = "buffer" | "json";
const get = async <T>(url: string, responseType: ResponseType): Promise<T> => {
let response = await got.get(url, {
responseType: responseType
});
return response.body;
};
get<string>("url", "json");