/** Exposed for the single log line in createEvent. */
export declare const CLIENT_THROTTLE_EVENTS_PER_WINDOW: number;
interface RateWindow {
    windowStartMs: number;
    count: number;
    toolUseAboveThreshold: number;
    suppressed: number;
    logged: boolean;
}
/**
 * Decide whether this outbound event should be suppressed (not sent).
 * Deterministic given (sessionId, type, now) and prior counter state.
 * Exported for unit tests; resetThrottleState() clears the module map.
 */
export declare function shouldSuppressEvent(sessionId: string, type: string, now: number): boolean;
/**
 * Returns the session's rate window exactly once per window — the first time the
 * throttle engages — for a single log line; later calls in the same window
 * return undefined. Keeps logging out of the hot path.
 */
export declare function consumeThrottleLogOnce(sessionId: string): RateWindow | undefined;
/** Test-only: clears the per-process rate map. */
export declare function resetThrottleState(): void;
/** Test-only: current size of the per-process rate map (eviction-bound check). */
export declare function throttleMapSize(): number;
/** Test-only: whether a session is currently tracked (eviction assertions). */
export declare function throttleMapHas(sessionId: string): boolean;
export {};