import type { RecoveryFn } from '../internal/function.js';
import { type NotNull, type Nullable } from './nullable.js';
/**
 *  Return _input_ as `T` if the passed _input_ is not `null`.
 *  Otherwise, return the result of _recoverer_.
 *
 *  * The result of _recoverer_ must not be `Nullable<*>`.
 *      * If you try to recover the value, use `orElse()`
 *  * If the result of _recoverer_ is `null`, throw `TypeError`.
 */
export declare function unwrapOrElseForNullable<T>(input: Nullable<T>, recoverer: RecoveryFn<NotNull<T>>): NotNull<T>;