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Kotlin Multiplatform SDK for ConfigCat, a feature flag, feature toggle, and configuration management service. That lets you launch new features and change your software configuration remotely without actually (re)deploying code. ConfigCat even helps you do controlled roll-outs like canary releases and blue-green deployments.

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package com.configcat

import platform.Foundation.NSUserDefaults

internal actual fun defaultCache(): ConfigCache {
    return UserDefaultsCache()
}

/**
 * [ConfigCache] implementation that uses [NSUserDefaults] as persistent storage.
 */
public class UserDefaultsCache : ConfigCache {
    private val userDefaults = NSUserDefaults.standardUserDefaults
    private val prefix = "com.configcat"

    override suspend fun read(key: String): String? = userDefaults.stringForKey("$prefix-$key")

    override suspend fun write(
        key: String,
        value: String,
    ) {
        userDefaults.setObject(value, "$prefix-$key")
    }
}