### SNS Notifier for AppConfig and S3

Source: https://github.com/nil-go/konf/blob/main/README.md

Register S3 and AppConfig loaders with an SNS notifier to receive change notifications. Start the notifier in a separate goroutine.

```go
notifier := sns.NewNotifier("konf-test")
notifier.Register(s3Loader, appConfigLoader)
go func() {
  if err := notifier.Start(ctx); err != nil {
    // handle error
  }
}()
```

--------------------------------

### Read Server Configuration and Register Change Callbacks

Source: https://github.com/nil-go/konf/blob/main/README.md

Shows how to read server configuration with default values and register callbacks to be executed when the configuration changes. Assumes configuration has been loaded previously.

```go
func (app *appObject) Run() {
    // Server configuration with default values.
    serverConfig := struct {
        Host string
        Port int
    }{
        Host: "localhost",
        Port: "8080",
    }
    // Read the server configuration.
    if err := konf.Unmarshal("server", &serverConfig);  err != nil {
        // Handle error here.
    }

    // Register callbacks while server configuration changes.
    konf.OnChange(func() {
      // Reconfig the application object.
    }, "server")

    // ... use cfg in app code ...
}
```

--------------------------------

### Load Configuration from Embed FS and Environment Variables

Source: https://github.com/nil-go/konf/blob/main/README.md

Demonstrates loading configuration from an embedded file system and environment variables early in the application's lifecycle. Handles potential errors during loading.

```go
//go:embed config
var config embed.FS

func main() {
    var config konf.Config

    // Load configuration from embed file system.
    if err := config.Load(fs.New(config, "config/config.json")); err != nil {
        // Handle error here.
    }
    // Load configuration from environment variables.
    if err := config.Load(env.New(env.WithPrefix("server"))); err != nil {
        // Handle error here.
    }

    // Watch the changes of configuration.
    go func() {
      if err := config.Watch(ctx); err != nil {
        // Handle error here.
      }
    }()

    konf.SetDefault(config)

    // ... other setup code ...
}
```

--------------------------------

### Explain Configuration Value Origin

Source: https://github.com/nil-go/konf/blob/main/README.md

Use Config.Explain to understand how a specific configuration value was resolved from different loaders. Sensitive information is automatically blurred.

```go
config.nest has value [map] is loaded by map.
Here are other value(loader)s:
  - env(env)
```

--------------------------------

### Load Configuration with Cobra Flags

Source: https://github.com/nil-go/konf/blob/main/README.md

Integrate Konf with Cobra CLI applications by using the pflag loader and the WithFlagSet option to bind Cobra's flags.

```go
config.Load(kflag.New(&config, kflag.WithFlagSet(yourCobraCmd.Flags())))
```

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