PERFORMANCE_MONITORING.md

Added in plugin version 7.3.0

Performance Monitoring?

With Firebase Performance Monitoring you get insights into how your app performs from your users' point of view, with automatic and customized performance tracing.

Learn more here..

Enabling Performance Monitoring

To add this feature to your project, either:

• Remove firebase.nativescript.json from the root of the project and run npm i, or
• Edit that file and add "performance_monitoring": true.

In both cases, remove the /platforms folder afterwards so the required native library will be added upon the next build.

⚠️ It may take up to 12 hours before results pop up in your Firebase console, so be patient.

ℹ️ Per Firebase's documentation, by enabling this feature, Remote Config will be enabled as well. So you may be interested in what Remote Config can do for your app.

API

startTrace

To be able to interact with a started trace, you can remember it in a property (in this case firebaseTrace):

import { performance as firebasePerformance } from "nativescript-plugin-firebase";
import { FirebaseTrace } from "nativescript-plugin-firebase/performance/performance";

const firebaseTrace: FirebaseTrace = firebasePerformance.startTrace("myTrace");

Now you can call several functions on the remembered trace object, read on below. And don't forget to use trace.stop afterwards.

trace.setValue

if (firebaseTrace) {
  firebaseTrace.setValue("foo", "bar");
}

trace.getValue

if (firebaseTrace) {
  firebaseTrace.getValue("foo");
}

trace.getAttributes

if (firebaseTrace) {
  const attributes = firebaseTrace.getAttributes();
  console.log(`trace attributes: ${attributes}`);
}

trace.removeAttribute

if (firebaseTrace) {
  const attributes = firebaseTrace.removeAttribute("foo");
}

trace.incrementMetric

if (firebaseTrace) {
  const incrementBy = 1;
  const attributes = firebaseTrace.incrementMetric("foo_metric", incrementBy);
}

trace.stop

To stop the trace, call stop on the remembered trace object:

if (firebaseTrace) {
  firebaseTrace.stop();
  firebaseTrace = undefined;
}