reaction-build: React/React Native Build Tool

reaction-build is a command-line interface (CLI) tool designed as a build utility for React and React Native projects. It provides features like React Native compatibility and isomorphic bundling, aiming to produce code usable across various JavaScript environments. Originally associated with the broader "Reaction" ecosystem, potentially Reaction Commerce, its primary function is to abstract away complex build configurations, similar to tools like Create React App or Webpack. The package is currently at version `1.0.0-rc.104`, a release candidate, and has not been updated since late 2018. This indicates that the project is no longer actively maintained and would likely face compatibility issues with modern Node.js versions (it requires `>= 4.0.0`) or contemporary React development practices. It lacks current official usage documentation, requiring users to infer functionality from its source or general build tool patterns.