export interface TimingResult {
    name: string;
    durationMs: number;
    result: unknown;
}
export interface MemorySnapshot {
    heapUsedMB: number;
    heapTotalMB: number;
    externalMB: number;
    rssMB: number;
    timestamp: string;
}
export interface DebugLogEntry {
    level: 'debug' | 'info' | 'warn' | 'error';
    message: string;
    data?: unknown;
    timestamp: string;
}
export declare function enableDebug(enabled?: boolean): void;
export declare function isDebugEnabled(): boolean;
export declare function debugLog(message: string, data?: unknown): void;
export declare function getDebugLog(limit?: number): DebugLogEntry[];
export declare function clearDebugLog(): void;
export declare function timeAsync<T>(name: string, fn: () => Promise<T>): Promise<TimingResult & {
    result: T;
}>;
export declare function time<T>(name: string, fn: () => T): TimingResult & {
    result: T;
};
export declare function memorySnapshot(): MemorySnapshot;
export declare function formatMemorySnapshot(snap: MemorySnapshot): string;
export declare function prettyJson(obj: unknown, indent?: number): string;
export declare function truncate(str: string, maxLen?: number): string;
export declare function assertDefined<T>(val: T | null | undefined, label: string): T;
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