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Update update guide with mapstructure package replacement.

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toimtoimtoim 2025-03-25 20:51:29 +02:00 • committed by Márk Sági-Kazár
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commit 39ab905028
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UPGRADE.md
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@ -83,6 +83,17 @@ v := viper.NewWithOptions(
)
```
### BREAKING: "github.com/mitchellh/mapstructure" depedency replaced
`mapstructure` package import has changed ([#1723](https://github.com/spf13/viper/pull/1723)) and code like take does not compile anymore
```go
err := viper.Unmarshal(&appConfig, func(config *mapstructure.DecoderConfig) {
config.TagName = "yaml"
})
```
To fix this issue, replace all instances of imports [`"github.com/mitchellh/mapstructure"`](https://github.com/mitchellh/mapstructure) with [`"github.com/go-viper/mapstructure/v2"`](https://github.com/go-viper/mapstructure/).
### BREAKING: HCL, Java properties, INI removed from core
In order to reduce third-party dependencies, Viper dropped support for the following formats from the core: