import type { FirebaseApp } from '@react-native-firebase/app';
import type { FirebasePerformance, HttpMetric, HttpMethod, PerformanceSettings, PerformanceTrace, ScreenTrace } from './types/perf';
/**
 * Returns a {@link FirebasePerformance} instance for the given app.
 * @param app - The FirebaseApp to use. Optional; defaults to the default app.
 */
export declare function getPerformance(app?: FirebaseApp): FirebasePerformance;
/**
 * Returns a {@link FirebasePerformance} instance for the given app (aligned with the Firebase JS SDK).
 * Can only be called once per app during initialization in typical usage.
 *
 * @param app - The FirebaseApp to use.
 * @param settings - Optional {@link PerformanceSettings}.
 */
export declare function initializePerformance(app: FirebaseApp, settings?: PerformanceSettings): FirebasePerformance;
/**
 * Returns a new {@link PerformanceTrace} instance.
 * @param performance - The {@link FirebasePerformance} instance to use.
 * @param name - The name of the trace.
 */
export declare function trace(performance: FirebasePerformance, name: string): PerformanceTrace;
/**
 * Creates an {@link HttpMetric} for a URL and HTTP method (React Native).
 * @param performance - The {@link FirebasePerformance} instance to use.
 * @param url - Request URL.
 * @param httpMethod - HTTP method.
 */
export declare function httpMetric(performance: FirebasePerformance, url: string, httpMethod: HttpMethod): HttpMetric;
/**
 * Creates a {@link ScreenTrace} with the given screen name.
 * Android only; throws if hardware acceleration is disabled or if Android is 9.0 or 9.1.
 * @param performance - The {@link FirebasePerformance} instance to use.
 * @param screenName - Screen name; no leading/trailing whitespace, no leading `_`, max length 100.
 */
export declare function newScreenTrace(performance: FirebasePerformance, screenName: string): ScreenTrace;
/**
 * Creates a {@link ScreenTrace} and starts it immediately.
 * Android only; throws if hardware acceleration is disabled or if Android is 9.0 or 9.1.
 * @param performance - The {@link FirebasePerformance} instance to use.
 * @param screenName - Name of the screen.
 */
export declare function startScreenTrace(performance: FirebasePerformance, screenName: string): Promise<ScreenTrace>;
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