fix(gatsby-plugin-mdx): add context dependency to mdx-scopes loader

[csr632]

Description

Otherwise webpack will not rebuild when new scpoes is writed into cache. This can happen if you change mdx file when gatsby develop.

Documentation

Related Issues

[pieh]

How do you trigger webpack not refreshing right now? (how to reproduce problem you are trying to fix)

[csr632]

I have made a minimal repo for this bug(based on gatsby-starter-hello-world):

csr632/reproduce-gatsby-pull-22121@b0a19a4

@pieh

[pieh]

Ok, the fix definitely fixes the issue with this reproduction. I do wonder if adding entire scope directory as dependency is correct here and whether it should be more nuanced. Not all scope files will need to be invalidated if any of scope files changes?

I'll tag @johno for his mdx and webpack insights ;)

[pieh]

Ok, after brief investigation - the mdx-scopes loader is used for "virtual" scopeContexts import and it targets single "file", so I think this is correct and we should "rebuild" that virtual module if anything in scopes directory changes.

Thanks @csr632!

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