Type Alias: InferFailure<T>

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

Defined in: result.ts:198

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

Type Parameters

T

T

A ResultMaybeAsync type or a function returning it.

Examples

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

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

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

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