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fix: stop loading the whole app for a background push

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`index.ts` imported `App` at the top, so when an FCM data message
started the headless push task in a cold process, the bundle evaluated
every screen, store, catalog and icon before the task could show its
notification.

The headless task is still registered at the top of `index.ts`, but the
root component now requires `App` when the UI first renders. A headless
start therefore only evaluates the task and its own imports; a normal
launch evaluates the same modules as before, one render later.

Measured with `npx expo export --platform android` (modules reached
through top-level requires from the entry, i.e. what a headless start
evaluates): 1,516 modules, 7,238 KB -> 202 modules, 745 KB.
This commit is contained in:
Linus Rath
2026-09-24 19:35:47 +02:00
parent 5bcfe1fe4d
commit 82ca359df7
1 changed files with 11 additions and 3 deletions
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index.ts
+11 -3
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@@ -1,7 +1,7 @@
import { createElement } from 'react';
import { AppRegistry } from 'react-native';
import { registerRootComponent } from 'expo';
import App from './App';
import { pushBackgroundTask } from './src/lib/push-background-task';
// Runs in a fresh headless JS runtime when BulwarkPushTaskService is started
@@ -9,7 +9,15 @@ import { pushBackgroundTask } from './src/lib/push-background-task';
// before the native service tries to invoke the task.
AppRegistry.registerHeadlessTask('BulwarkPushTask', () => pushBackgroundTask);
// registerRootComponent calls AppRegistry.registerComponent('main', () => App);
// A headless push task evaluates this file too, so App is required when the
// UI first renders instead of imported above: importing it here would load
// every screen, store and icon before the task could run.
function Root() {
const App = (require('./App') as typeof import('./App')).default;
return createElement(App);
}
// registerRootComponent calls AppRegistry.registerComponent('main', () => Root);
// It also ensures that whether you load the app in Expo Go or in a native build,
// the environment is set up appropriately
registerRootComponent(App);
registerRootComponent(Root);