react-native-startup-trace

:warning: You need Firebase performance installed on your project
See the Firebase docs

Getting started

$ npm install react-native-startup-trace --save

Usage

In ios/AppDelegate.m:

``objc
#import

...

- (BOOL)application:(UIApplication )application didFinishLaunchingWithOptions:(NSDictionary )launchOptions
{
...

// After Firebase initialization
[StartupPerformanceTrace start];

...
return YES;
}
`

In MainApplication.java

`java
import tech.bam.rnperformance.startuptrace.StartupTraceModule;

...

@Override
public void onCreate() {
super.onCreate();
SoLoader.init(this, / native exopackage / false);

StartupTraceModule.start();
}
`

In App.js
`javascript
import { useStopStartupTrace } from 'react-native-startup-trace';

const App = () => {
useStopStartupTrace();

return (
...
)
};
`

$3

#### Android

Follow the Firebase Android doc step 4 to view the logs.
Then run:
`
adb logcat | grep STARTUP_JS
`
And start the app.

You should see something similar to:

`
FirebasePerformance: Logging trace metric - STARTUP_JS 2423.1650ms
``