export declare const STALE_SLACK_MESSAGE_MAX_AGE_MS: number;
export interface SlackMessageStalenessInput {
    source: string;
    timestamp: string;
}
export interface SlackMessageStalenessOptions {
    nowMs?: number;
    maxAgeMs?: number;
}
export declare function parseSlackTimestampMs(timestamp: string): number | null;
export declare function getSlackMessageAgeMs(input: SlackMessageStalenessInput, options?: SlackMessageStalenessOptions): number | null;
export declare function isStaleSlackMessage(input: SlackMessageStalenessInput, options?: SlackMessageStalenessOptions): boolean;