10 | |
11 |
12 | ```ts
13 | import AsyncStorage from '@react-native-async-storage/async-storage';
14 | import {MMKV} from 'react-native-mmkv';
15 |
16 | export const storage = new MMKV();
17 |
18 | // TODO: Remove `hasMigratedFromAsyncStorage` after a while (when everyone has migrated)
19 | export const hasMigratedFromAsyncStorage = storage.getBoolean(
20 | 'hasMigratedFromAsyncStorage',
21 | );
22 |
23 | // TODO: Remove `hasMigratedFromAsyncStorage` after a while (when everyone has migrated)
24 | export async function migrateFromAsyncStorage(): Promise {
25 | console.log('Migrating from AsyncStorage -> MMKV...');
26 | const start = global.performance.now();
27 |
28 | const keys = await AsyncStorage.getAllKeys();
29 |
30 | for (const key of keys) {
31 | try {
32 | const value = await AsyncStorage.getItem(key);
33 |
34 | if (value != null) {
35 | if (['true', 'false'].includes(value)) {
36 | storage.set(key, value === 'true');
37 | } else {
38 | storage.set(key, value);
39 | }
40 |
41 | AsyncStorage.removeItem(key);
42 | }
43 | } catch (error) {
44 | console.error(
45 | `Failed to migrate key "${key}" from AsyncStorage to MMKV!`,
46 | error,
47 | );
48 | throw error;
49 | }
50 | }
51 |
52 | storage.set('hasMigratedFromAsyncStorage', true);
53 |
54 | const end = global.performance.now();
55 | console.log(`Migrated from AsyncStorage -> MMKV in ${end - start}ms!`);
56 | }
57 | ```
58 |
59 | |
60 |
61 | 
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62 | 
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