expo-updates/build/UpdatesEmitter.js

Fetches and manages remotely-hosted assets and updates to your app's JS bundle.

import { DeviceEventEmitter } from 'expo-modules-core';
import { EventEmitter } from 'fbemitter';
import { transformNativeStateMachineContext } from './Updates';
let _emitter;
function _getEmitter() {
    if (!_emitter) {
        _emitter = new EventEmitter();
        DeviceEventEmitter.addListener('Expo.nativeUpdatesEvent', _emitEvent);
        DeviceEventEmitter.addListener('Expo.nativeUpdatesStateChangeEvent', _emitNativeStateChangeEvent);
    }
    return _emitter;
}
// Reemits native UpdateEvents sent during the startup update check
function _emitEvent(params) {
    if (!_emitter) {
        throw new Error(`EventEmitter must be initialized to use from its listener`);
    }
    let newParams = { ...params };
    if (typeof params === 'string') {
        newParams = JSON.parse(params);
    }
    if (newParams.manifestString) {
        newParams.manifest = JSON.parse(newParams.manifestString);
        delete newParams.manifestString;
    }
    _emitter.emit('Expo.updatesEvent', newParams);
}
// Reemits native state change events
function _emitNativeStateChangeEvent(params) {
    if (!_emitter) {
        throw new Error(`EventEmitter must be initialized to use from its listener`);
    }
    let newParams = { ...params };
    if (typeof params === 'string') {
        newParams = JSON.parse(params);
    }
    newParams.context = transformNativeStateMachineContext(newParams.context);
    _emitter.emit('Expo.updatesStateChangeEvent', newParams);
}
/**
 * @deprecated Adds a callback to be invoked when updates-related events occur (such as upon the initial app
 * load) due to auto-update settings chosen at build-time. See also the
 * [`useUpdateEvents`](#useupdateeventslistener) React hook.
 * This API is deprecated and will be removed in a future release corresponding with SDK 51.
 * Use [`useUpdates()`](#useupdates) instead.
 *
 * @param listener A function that will be invoked with an [`UpdateEvent`](#updateevent) instance
 * and should not return any value.
 * @return An `EventSubscription` object on which you can call `remove()` to unsubscribe the
 * listener.
 */
export function addListener(listener) {
    const emitter = _getEmitter();
    return emitter.addListener('Expo.updatesEvent', listener);
}
// Internal methods
/**
 * @hidden
 */
export const addUpdatesStateChangeListener = (listener) => {
    // Add listener for state change events
    const emitter = _getEmitter();
    return emitter.addListener('Expo.updatesStateChangeEvent', listener);
};
/**
 * @hidden
 */
export const emitStateChangeEvent = (event) => {
    // Allows JS to emit a state change event (used in testing)
    _emitNativeStateChangeEvent(event);
};
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