import type { ParjsCombinator } from "../../";
import type { ParjsValidator } from "../parjser";
/**
 * Applies the source parser and makes sure its result fulfills `predicate`.
 *
 * @param predicate The condition to check for.
 */
export declare function must<T>(predicate: ParjsValidator<T>): ParjsCombinator<T, T>;
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