MoshiDatastore.kt

@Module
@InstallIn(SingletonComponent::class)
internal object DataStoreModule {
  
    @Provides
    @Singleton
    fun provideMyCacheDataStore(
        @ApplicationContext context: Context,
        moshi: Moshi,
    ): DataStore<MyCachedDataClass> {
        return DataStoreFactory.create(
            produceFile = { context.dataStoreFile("MY_CACHE_DATA_SOURCE.json") },
            serializer = DataStoreJsonSerializer(
                defaultValue = MyCachedDataClass(),
                provideJsonAdapter = { moshi.adapter(MyCachedDataClass::class.java) },
            ),
            corruptionHandler = ReplaceFileCorruptionHandler { MyCachedDataClass() },
        )
    }
}
    
class DataStoreJsonSerializer<T>(
    override val defaultValue: T,
    // use function to provide moshi adapter to prevent initiating on main thread
    private val provideJsonAdapter: () -> JsonAdapter<T>,
) : Serializer<T> {

    override suspend fun readFrom(input: InputStream): T {
        return try {
            input.source().buffer().use {
                checkNotNull(provideJsonAdapter().fromJson(it))
            }
        } catch (e: Exception) {
            logInfo(e) { "Unable to read datastore" }
            throw CorruptionException("Unable to read datastore", e) // handled by corruptionHandler
        }
    }

    override suspend fun writeTo(t: T, output: OutputStream) {
        try {
            output.sink().buffer().use {
                provideJsonAdapter().toJson(it, t)
            }
        } catch (e: Exception) {
            logError(e) { "Unable to write to datastore" }
        }
    }
}

can u provide if handle list in object ?, i think the code is a problem with moshi list adapter

There are no special usages or restrictions in regards to Moshi. You can see from the code that we just call fromJson and toJson. Please check out the Moshi documentation to see how to use specific type adapters like for lists.