feat(mdx-loader): Support MDX source-map #11083
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Motivation
We should be able to use source map for MDX files, to know which line an MDX error comes from more easily. Note: this is only for runtime errors, and not MDX syntax/compilation errors.
Unfortunately, it's not as easy as I thought and this PR is only a WIP initial attempt.
For now we get errors such as:
Also, we are concatenating strings in our MDX loaders so it's unlikely to work well, and we'd first need to refactor that.
Inspired by https://github.com/mdx-js/mdx/blob/main/packages/loader/lib/index.js
I will continue working on this later
Test Plan
CI
Test links
https://deploy-preview-11083--docusaurus-2.netlify.app/