import type { Result } from './interface.js';
import { ok_tag } from '../../Constant/mod.js';
export interface Ok<O> extends Result<O, never> {
    readonly _tag: typeof ok_tag;
    readonly value: O;
}
/** ## Ok<O> : 表示成功并包含一个值  */
export declare function Ok<O = void>(value?: O): Result<O, never>;
export declare function is_ok<T>(val: Result<T, any>): val is Ok<T>;
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