throwIfNamespace doesn't work

Bug Report

Current Behavior I’m building a library that need to be able to work with JSX with namespaces. According to Babel documentation this should work by setting the throwIfNamespace option. However this does not seem to work.

Input Code https://github.com/TheKnarf/babel-namespace-test

Expected behavior/code Running babel src/index.js should transpile the test code without any errors.

Babel Configuration (.babelrc, package.json, cli command)

{
  presets: ['@babel/preset-react'],
  plugins: [
    ['@babel/transform-react-jsx', {
      'pragma': 'dom',
		'throwIfNamespace': false
    }]
  ]
}

Environment

• Babel version(s): 7.1.2 (@babel/core 7.1.2)
• Node/npm version: v10.12.0
• OS: macOS 10.13.6
• How you are using Babel: cli

Additional context/Screenshots

[loganfsmyth]

If you load '@babel/preset-react' and '@babel/transform-react-jsx' at the same time, you’re loading two separate copies of '@babel/transform-react-jsx' with their own independent sets of options. While one of them has throwIfNamespace: false set, the other one will still do its default behavior of throwing an exception.

[TheKnarf]

Thanks, @loganfsmyth! I didn’t realize it would load it twice.

I guess that closes this issue.