Use `file.fail` instead of throwing an error

[wooorm]

Initial checklist

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

Problem

rehype-highlight/lib/index.js

Line 111 in dd58e39

throw error

Solution

This error relates to a node, at a certain place. It should be thrown on the vfile.

Alternatives

n/a

[github-actions]

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