I want to write the new config value in the config file.

[asjgi]

I want to write the new config value directly in the config file(config.yaml)

` if "DEV" == viper.GetString("PROJECT_STAGE") {

		fmt.Println("DEV mode changed")
		fmt.Println("NOW STAGE == " + viper.GetString("PROJECT_STAGE"))
	} else {
		viper.SetDefault("PROJECT_STAGE", "QA")
		fmt.Println("NOW STAGE == " + viper.GetString("PROJECT_STAGE"))
	}

`

but It does not change the config file through SetDefault() & Set().
How could I change the file of config value by viper