feat: add throwIfNamespace option for custom JSX runtime

[iMrDJAi]

Description

This change allows passing throwIfNamespace to babel-plugin-transform-react-jsx through @vitejs/plugin-react options.

Fixes #6554.

Additional context

This option is enabled by default, causing the following error when using xml namespace prefixes: Namespace tags are not supported by default. React's JSX doesn't support namespace tags. You can set throwIfNamespace: false to bypass this warning.

Currently there is no way to set throwIfNamespace to false without that change.

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[patak-dev]

I think we could merge this option. For a future version, we may want to directly let the use pass a jsxOptions object. For the moment, this looks better as there aren't many other options to configure and we may want to migrate to something different than babel later on. https://babeljs.io/docs/en/babel-plugin-transform-react-jsx#options

[iMrDJAi]

@patak-dev When will you merge this?

[patak-dev]

@aleclarson @frandiox could you check if this looks good to you so we can merge it?

[frandiox]

@patak-dev LGTM, we haven't had any issue with prefixes in JSX so far but I guess it's good to have an option to disable it👍

[iMrDJAi]

@patak-dev Go ahead :)

[iMrDJAi]

@patak-dev Can you merge it now?

[iMrDJAi]

@aleclarson Thank you! Is there any ETA on when this change will get released on NPM?

[patak-dev]

@iMrDJAi it is going to be released in tandem with Vite 3.2. We should get a beta for plugin-react out next week