import type { Fn, Option, Result } from '../../../mod.js';
import type { Either } from './interface.js';
import { left_tag } from '../../Constant/mod.js';
export interface Left<T> extends Either<T, never> {
    readonly _tag: typeof left_tag;
    readonly value: T;
}
export declare class left<T> implements Left<T> {
    readonly _tag: typeof left_tag;
    readonly value: T;
    get is_left(): true;
    get is_right(): false;
    constructor(left: T);
    unwrap(): T | never;
    unwrap_left(): T;
    unwrap_right(): never;
    unwrap_lor<O>(_or: O): T | O;
    unwrap_ror<O>(or: O): O;
    exchange(): Either<never, T>;
    left_do(callback: (val: T) => void): void;
    right_do(): void;
    match(left: Fn<T, void>, _right: Fn<never, void>): void;
    into<R extends 'option' | 'result'>(flag: R): R extends 'option' ? Option<T> : R extends 'result' ? Result<T, never> : never;
    as<R extends 'boolean'>(flag: R): R extends 'boolean' ? boolean : never;
}
export declare function Left<T>(val: T): Left<T>;
//# sourceMappingURL=left.d.ts.map