declare const SENTINEL_PREFIXES: {
    readonly observation: "obs_";
    readonly signal: "sig_";
    readonly action: "act_";
    readonly approval: "apr_";
    readonly effect: "eff_";
    readonly worldEvent: "we_";
    readonly cadence: "cad_";
    readonly monitorRun: "mrn_";
};
export type SentinelIdKind = keyof typeof SENTINEL_PREFIXES;
export declare function ulid(now?: number): string;
export declare function generateSentinelId(kind: SentinelIdKind, now?: number): string;
export declare function shortSentinelId(fullId: string, length?: number): string;
export {};
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