javascript - How to distinguish development time dependencies from runtime dependencies?

Question

How to determine whether the imported module in package.json is a runtime dependency (dependencies) or a development time dependency (devDependencies), such as which react is?

Answer 1

dependencies: {
    react: ^15.4.2
}

It can be understood this way: what is finally packaged is dependencies; it is just dev that is relied upon during development, such as various babel-plugin-*, *-loader