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By default, the iOS app has two configurations: debug and release.

You can add more configurations as shown here. Using different configurations, you can create different versions of your app: each build parameter in Xcode can have different values depending on the configuration, including user-defined.

For example, it is useful to have an AppStore configuration and a release configuration for local testing, which can use different endpoints, api keys, etc.

xcodeConfigurationToNativeBuildType lets the multiplatform kotlin plugin know which build type a particular custom configuration should be built with - the debug configuration is slower, but gives more debugging options.