gui/apps/kitchen-sink/plugins/detox-skip-splash.js

// Skip Expo SplashScreen registration when launched by Detox.
//
// SplashScreenManager.registerOnActivity installs an OnPreDrawListener that
// returns false on every frame until JS calls SplashScreen.hideAsync(). That
// continuous re-draw keeps the main looper from ever going idle, which trips
// AndroidX MonitoringInstrumentation.startActivitySync's hardcoded 45s idle
// timeout on slow CI emulators where bundle download + eval takes longer than
// that. Without this fix, every Detox-driven launch on the GitHub Actions
// software-graphics emulator fails with:
//   "Could not launch intent ... within 45000 milliseconds. Perhaps the main
//    thread has not gone idle within a reasonable amount of time?"
//
// The android/ folder is gitignored (regenerated by expo prebuild), so this
// plugin re-injects the patch on every prebuild.
const { withMainActivity } = require('@expo/config-plugins')

const MARKER = 'isUnderDetox'

module.exports = function withDetoxSkipSplash(config) {
  return withMainActivity(config, (config) => {
    if (config.modResults.contents.includes(MARKER)) {
      return config
    }

    let contents = config.modResults.contents

    // Wrap the SplashScreenManager.registerOnActivity(this) call in a guard.
    contents = contents.replace(
      /SplashScreenManager\.registerOnActivity\(this\)/,
      'if (!isUnderDetox()) {\n      SplashScreenManager.registerOnActivity(this)\n    }'
    )

    // Insert the isUnderDetox() helper just before the final closing brace of
    // the MainActivity class. Match the last "}" in the file (Kotlin source).
    const helper = `
  private fun isUnderDetox(): Boolean {
    // Detox.LaunchArgs.asIntentBundle() copies all instrumentation args
    // (including detoxServer / detoxSessionId) into the activity's
    // "launchArgs" bundle extra.
    val launchArgs = intent?.getBundleExtra("launchArgs") ?: return false
    return launchArgs.containsKey("detoxServer") ||
      launchArgs.containsKey("detoxSessionId")
  }
`

    // insert helper before the final closing brace of the class
    const lastBrace = contents.lastIndexOf('}')
    if (lastBrace === -1) {
      throw new Error(
        'detox-skip-splash plugin: could not find closing brace in MainActivity.kt'
      )
    }
    contents = contents.slice(0, lastBrace) + helper + contents.slice(lastBrace)

    config.modResults.contents = contents
    return config
  })
}