/** Payload / timer bounds shared by the engine and default sinks. */
export declare const DEFAULT_MAX_STEPS = 50;
export declare const MAX_STEPS_CAP = 200;
export declare const MAX_TAG_KEYS = 32;
export declare const MAX_ATTRIBUTE_KEYS = 64;
export declare const MAX_ATTRIBUTED_REQUEST_KEYS = 50;
export declare const MAX_TAG_VALUE_LEN = 200;
export declare const DEFAULT_JOURNEY_IDLE_MS: number;
/** True for prototype-polluting keys and a small secret-name deny-list (case-insensitive). */
export declare function isUnsafeKey(key: string): boolean;
/**
 * Finite integer ≥ 1, else `fallback`. Used for maxSteps-like caps.
 * Non-finite / ≤ 0 / non-numbers return `fallback`.
 */
export declare function finitePositiveInt(n: unknown, fallback: number): number;
/**
 * Journey/step timeout: finite ≥ 0 keeps the value (floored); anything else is 0 (disabled).
 */
export declare function finiteTimeoutMs(n: unknown): number;
/** Clamp recorded-step cap to 1..MAX_STEPS_CAP; invalid → DEFAULT_MAX_STEPS. */
export declare function clampMaxSteps(n: unknown): number;
/** Finite ≥ 0 slow-request threshold, or undefined to fall through. */
export declare function finiteSlowRequestMs(n: unknown): number | undefined;
/** Explicit 0 disables; omitted uses idle default; finite N keeps caller timeout. */
export declare function resolveJourneyTimeoutMs(timeoutMs: number | undefined, idleDefaultMs?: number): {
    ms: number;
    explicit: boolean;
};
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