import { NativeModules } from 'react-native'; type AesGcmModifiedType = { decrypt( base64Ciphertext: string, key: string, ): Promise; encrypt( plainText: string, inBinary: boolean, key: string ): Promise; }; const { AesGcmModified } = NativeModules; export default AesGcmModified as AesGcmModifiedType;