expo-modules-core/build/NativeModulesProxy.native.js

The core of Expo Modules architecture

import { NativeModules } from 'react-native';
const ExpoNativeProxy = global.ExpoModules?.NativeModulesProxy;
const LegacyNativeProxy = NativeModules.NativeUnimoduleProxy;
const modulesConstantsKey = 'modulesConstants';
const exportedMethodsKey = 'exportedMethods';
const NativeModulesProxy = {};
if (LegacyNativeProxy) {
    // use JSI proxy if available, fallback to legacy RN proxy
    const NativeProxy = ExpoNativeProxy ?? LegacyNativeProxy;
    Object.keys(NativeProxy[exportedMethodsKey]).forEach((moduleName) => {
        // copy constants
        NativeModulesProxy[moduleName] = NativeProxy[modulesConstantsKey][moduleName] || {};
        // copy methods
        NativeProxy[exportedMethodsKey][moduleName].forEach((methodInfo) => {
            NativeModulesProxy[moduleName][methodInfo.name] = (...args) => {
                const { key, argumentsCount } = methodInfo;
                if (argumentsCount !== args.length) {
                    return Promise.reject(new Error(`Native method ${moduleName}.${methodInfo.name} expects ${argumentsCount} ${argumentsCount === 1 ? 'argument' : 'arguments'} but received ${args.length}`));
                }
                // We still want to call methods using the legacy proxy in SDK 46
                return LegacyNativeProxy.callMethod(moduleName, key, args);
            };
        });
        // These are called by EventEmitter (which is a wrapper for NativeEventEmitter)
        // only on iOS and they use iOS-specific native module, EXReactNativeEventEmitter.
        //
        // On Android only {start,stop}Observing are called on the native module
        // and these should be exported as Expo methods.
        //
        // Before the RN 65, addListener/removeListeners weren't called on Android. However, it no longer stays true.
        // See https://github.com/facebook/react-native/commit/f5502fbda9fe271ff6e1d0da773a3a8ee206a453.
        // That's why, we check if the `EXReactNativeEventEmitter` exists and only if yes, we use it in the listener implementation.
        // Otherwise, those methods are NOOP.
        if (NativeModules.EXReactNativeEventEmitter) {
            NativeModulesProxy[moduleName].addListener = (...args) => NativeModules.EXReactNativeEventEmitter.addProxiedListener(moduleName, ...args);
            NativeModulesProxy[moduleName].removeListeners = (...args) => NativeModules.EXReactNativeEventEmitter.removeProxiedListeners(moduleName, ...args);
        }
        else {
            // Fixes on Android:
            // WARN  `new NativeEventEmitter()` was called with a non-null argument without the required `addListener` method.
            // WARN  `new NativeEventEmitter()` was called with a non-null argument without the required `removeListeners` method.
            NativeModulesProxy[moduleName].addListener = () => { };
            NativeModulesProxy[moduleName].removeListeners = () => { };
        }
    });
}
else {
    console.warn(`The "EXNativeModulesProxy" native module is not exported through NativeModules; verify that expo-modules-core's native code is linked properly`);
}
export default NativeModulesProxy;
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