Configurable timeout for native app start plugins

[yousif-bugsnag]

Goal

The current 500ms view load span timeout for native app starts sometimes isn’t long enough, particularly in debug builds where the React Native layer can take a long time to initialize.

This PR ups the default timeout to 5ms, and allows users to configure their own timeout via the ReactNativeAppStartPlugin constructor

Design

On Android, the timeout is an integer in milliseconds, while on Objective-C the timeout is an NSTimeInterval in seconds.

Android

BugsnagPerformance.start(PerformanceConfiguration.load(this).apply {
  addPlugin(ReactNativeAppStartPlugin(500))     // 500ms timeout
})

iOS

let config = BugsnagPerformanceConfiguration.loadConfig()
config.add(BugsnagReactNativeAppStartPlugin(timeout: 0.5)) // 500ms timeout
BugsnagPerformance.start(configuration: config)

Testing

Tested manually

[github-actions]

Browser bundle size

NPM build

	Package
Before	234.62 kB
After	234.62 kB
±	No change

CDN build

	Unminified	Minfied	Minified + gzipped
Before	119.01 kB	45.94 kB	13.25 kB
After	119.01 kB	45.94 kB	13.25 kB
±	No change	No change	No change

Code coverage

Coverage values did not change👌.

Total:

Lines	Branches	Functions	Statements
84.67%(+0%)	61.91%(+0%)	75.43%(+0%)	81.5%(+0%)

Generated against 123600f on 21 November 2025 at 17:22:37 UTC