import * as p_di from "../../schema.js";
import { type Command_Promise } from "../../interface/__internal/command/Command_Promise.js";
import { type Command_Block } from "./Command_Block.js";
export type Option<T extends p_di.Value> = readonly [string, T];
export declare function option<T extends p_di.Value, Error extends p_di.Value>(option: Option<T>, $c: ($: T) => Command_Block<Error>): Command_Block<Error>;
export declare function exhaustive<Error extends p_di.Value>(_x: never): Command_Block<Error>;
export declare namespace decide {
    const state: <T extends p_di.State, Error extends p_di.Value>(state: T, assign: (output: T) => Command_Block<Error>) => Command_Promise<Error>;
}