import type { PolicyTransitionSink } from './types.ts';
export type PolicyTransitionCollector = PolicyTransitionSink & {
    /**
     * The earliest reported instant, or undefined when nothing reported one.
     */
    readonly next: Date | undefined;
};
/**
 * A sink keeping the earliest reported instant, which is the moment an answer
 * built from every evaluation it was handed to stops being current.
 */
export declare function createPolicyTransitionCollector(): PolicyTransitionCollector;
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