Type Alias InferFailure<T>

InferFailure: [T] extends [(...args: any[]) => ResultMaybeAsync<any, infer U>]
? U
: [T] extends [ResultMaybeAsync<any, infer U>] ? U : never

Infers the Failure value type E from a Result or a function returning a Result.

Type Parameters

T
A ResultMaybeAsync type or a function returning it.

Example: From a result object

import { Result } from '@praha/byethrow';

type R = Result.Result<number, string>;
type ErrorValue = Result.InferFailure<R>; // string

Example: From a function

import { Result } from '@praha/byethrow';

const fn = () => Promise.resolve({ type: 'Failure', error: new Error() } as const);
type ErrorValue = Result.InferFailure<typeof fn>; // Error