react/metro v0.53.0 on GitHub

[Breaking]: Support setting custom BABEL_ENV in transformer (more info).
[Feature]: Move the react-native-symbolicate package to the Metro repository, under the name metro-symbolicate (more info).
[Fixed]: Don't override process.env.NODE_ENV in prelude if already set (more info).
[Fixed]: Add missing dependencies (more info: 1, 2).
[Improvement]: Remove dependency on babel-core which has since been renamed @babel/core (more info).