import { Arity1 } from '@typed/lambda';
import { Just } from './Just';
import { Maybe } from './Maybe';
/**
 * Used for performing side-effects with a Maybe
 */
export declare const unwrap: {
    <A, B>(fn: Arity1<A, B>, maybe: Just<A>): B;
    <A, B>(fn: Arity1<A, B>, maybe: Maybe<A>): B | null;
    <A, B>(fn: Arity1<A, B>): {
        (maybe: Just<A>): B;
        (maybe: Maybe<A>): B | null;
    };
};
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