react-native-mmkv/lib/module/createMMKV.mock.js

The fastest key/value storage for React Native. ~30x faster than AsyncStorage! Works on Android, iOS and Web.

"use strict";

/* Mock MMKV instance for use in tests */
export const createMockMMKV = () => {
  const storage = new Map();
  return {
    clearAll: () => storage.clear(),
    delete: key => storage.delete(key),
    set: (key, value) => storage.set(key, value),
    getString: key => {
      const result = storage.get(key);
      return typeof result === 'string' ? result : undefined;
    },
    getNumber: key => {
      const result = storage.get(key);
      return typeof result === 'number' ? result : undefined;
    },
    getBoolean: key => {
      const result = storage.get(key);
      return typeof result === 'boolean' ? result : undefined;
    },
    getBuffer: key => {
      const result = storage.get(key);
      return result instanceof ArrayBuffer ? result : undefined;
    },
    getAllKeys: () => Array.from(storage.keys()),
    contains: key => storage.has(key),
    recrypt: () => {
      console.warn('Encryption is not supported in mocked MMKV instances!');
    },
    size: 0,
    isReadOnly: false,
    trim: () => {
      // no-op
    }
  };
};
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