import { NativeModules } from 'react-native'; const FirebasePerformance = NativeModules.RNFirebasePerformance; export default class Trace { constructor(perf: Object, identifier: string) { this.perf = perf; this.identifier = identifier; } start() { FirebasePerformance.start(this.identifier); } stop() { FirebasePerformance.stop(this.identifier); } incrementCounter(event: string) { FirebasePerformance.incrementCounter(this.identifier, event); } }