[feat] export `Configuration` for reusing

[JounQin]

Initial checklist

• [X] I read the support docs
• [X] I read the contributing guide
• [X] I agree to follow the code of conduct
• [X] I searched issues and couldn’t find anything (or linked relevant results below)

Problem

Configuration is used in eslint-mdx for loading remark configuration by using unified-engine/lib/configuration

https://github.com/mdx-js/eslint-mdx/blob/1ca5afd1d6e40d021d33c6f3177447e38e7263db/packages/eslint-mdx/src/worker.ts#L67-L76

It should be considered as private API path, I see we are migrating to exports field in package.json, which might make Configuration unavailable later.

Solution

export Configuration from root at the same time.

Alternatives

N/A

[wooorm]

Hm. I recommend PRing to expose Configuration from index.js then. With a note that says it’s mostly private, but useful for tools like eslint-mdx. Then I wont remove it when indeed going with exports

[github-actions[bot]]

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