Merge pull request #235 from mixpanel/zihe-fix-init-storage

Avoid crash if AsyncStorage is null

index.js

@@ -82,7 +82,7 @@ export class Mixpanel {
     superProperties = {},
     serverURL = "https://api.mixpanel.com"
   ) {
-    await MixpanelReactNative.initialize(
+    await this.mixpanelImpl.initialize(
       this.token,
       this.trackAutomaticEvents,
       optOutTrackingDefault,

javascript/mixpanel-storage.js

@@ -3,7 +3,15 @@ import {MixpanelLogger} from "mixpanel-react-native/javascript/mixpanel-logger";
 export class AsyncStorageAdapter {
   constructor(storage) {
     if (!storage) {
-      this.storage = require("@react-native-async-storage/async-storage");
+      try {
+        this.storage = require("@react-native-async-storage/async-storage");
+      } catch {
+        console.error(
+          "[@RNC/AsyncStorage]: NativeModule: AsyncStorage is null. Please run 'npm install @react-native-async-storage/async-storage' or follow the Mixpanel guide to set up your own Storage class."
+        );
+        console.error("[Mixpanel] Falling back to in-memory storage");
+        this.storage = new InMemoryStorage();
+      }
     } else {
       this.storage = storage;
     }
@@ -34,3 +42,21 @@ export class AsyncStorageAdapter {
     }
   }
 }
+
+class InMemoryStorage {
+  constructor() {
+    this.store = {};
+  }
+
+  async getItem(key) {
+    return this.store.hasOwnProperty(key) ? this.store[key] : null;
+  }
+
+  async setItem(key, value) {
+    this.store[key] = value;
+  }
+
+  async removeItem(key) {
+    delete this.store[key];
+  }
+}