export declare function startTrace(name: string): FirebaseTrace;
export declare class FirebaseTrace {
    private nativeTrace;
    constructor(nativeTrace: com.google.firebase.perf.metrics.Trace);
    setValue(attribute: string, value: string): void;
    getValue(attribute: string): string;
    getAttributes(): {
        [field: string]: any;
    };
    removeAttribute(attribute: string): void;
    incrementMetric(metric: string, by: number): void;
    stop(): void;
}