'Buck for react-native

I create a skeleton of the react native project with the standard command

npx react-native init NewProject

And project directory includes .buckconfig file, like this

[android]
  target = Google Inc.:Google APIs:23

[maven_repositories]
  central = https://repo1.maven.org/maven2

I read the off docs, but it doesn't clear. I don't understand what positive things to use it.

What are the pros and cons of using buck?

Sources

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