Languages provided to the highlighter.codeToHtml() function are case-sensitive

[Masstronaut]

highlighter.codeToHtml(code, { lang: 'yaml' }) works fine, but these both fail:

• highlighter.codeToHtml(code, { lang: 'Yaml' })
• 'highlighter.codeToHtml(code, { lang: 'YAML' })'

I can fix this on my end now that I know what the issue is, though it seems a bit silly to have the highlighter throw if the only issue is casing of the language.

Would you be open to approving a PR to that runs .toLowerCase() to solve this issue, or is throwing in this scenario the desired/intended behavior for the project?

[antfu]

I believe this is the intended behavior. It's better to normalize your language id before passing in.