import type { YobtaMaybe } from '../_types/YobtaMaybe.js';
import type { YobtaSyncRule } from '../rule/rule.js';
export declare const constantMessage: <I>(value: I) => string;
export declare function constant<I, O>(value: O, message?: string): YobtaSyncRule<I, YobtaMaybe<I, O>>;
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