Rust & Golang inspired error handing in Node

result.ts

export type Success<Data> = readonly [Data, undefined];
export type Failure<Err = Error> = readonly [undefined, Err];

/** A cross between Rust and Golang exception handling. I greatly dislike exceptions */
export type Result<Data, Err = Error> = Promise<(Success<Data> | Failure<Err>)>

export const Ok = <T>(data: T): Success<T> => [data, undefined]
export const Err = <E = Error>(error: E): Failure<E> => [undefined, error]

e.g.

async function list(): Result<Wfm.Item[]> {
  return axiosInstance.get<{ payload: { items: Wfm.Item[] } }>('/items')
    .then(response => Ok(response.data.payload.items))
    .catch(err => Err(err))
}