@shikijs/markdown-it: code block is wrong when entering a non-existent language

[Only566]

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Describe the bug

Code block is wrong when entering a non-existent language, even if the input is not complete, an error will be reported.

Allowing configuration of a default language during initialization may be a good solution.

MarkdownItPluginShiki({
  defaultLang: 'text'
})

Reproduction

Contributes

• I am willing to submit a PR to fix this issue
• I am willing to submit a PR with failing tests

[antfu]

PR welcome :)

[rglover]

This can be resolved if you add a fallbackLanguage to the options like so:

md.use(await Shiki({
  fallbackLanguage: 'javascript',
  defaultLanguage: 'javascript',
  themes: {
    light: 'slack-ochin',
  }
}));

Just tested against latest v1.6.2 release and can confirm it falls back as expected when you have non-existent language (or a typo in the language name).