/**
 * Keyboard Collector — tracks keydown/keyup timing.
 * NEVER captures actual key values for printable characters (PII-safe).
 * Only safe keys: Backspace, Tab, Enter, ArrowKeys.
 * All other keys recorded as "CHAR" (anonymized).
 */
import type { TelemetryEvent } from '../types.js';
export declare function startKeyboardTracking(push: (event: TelemetryEvent) => void): void;
export declare function stopKeyboardTracking(): void;
export declare function getKeyboardStats(): {
    backspaceCount: number;
};
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