import { Destructor, TimeSpan } from '@synnaxlabs/x';
export declare class Tracker {
    private readonly entries;
    private readonly target;
    constructor(target: TimeSpan);
    measure(key: string): [number, Destructor];
    updateLevels(): void;
    levels(): Map<string, number>;
}
//# sourceMappingURL=performance.d.ts.map