CJK Friendly

Improves bold and italic parsing adjacent to CJK (Chinese, Japanese, Korean) characters.

Core feature — always active, no configuration required.

What it does

CommonMark's emphasis-flanking rules treat CJK ideographs and kana as neither whitespace nor punctuation. As a result, **bold** or _italic_ markers placed immediately next to Chinese, Japanese, or Korean characters are parsed as literal asterisks and underscores rather than formatting delimiters.

The CJK Friendly feature post-processes the markdown AST and re-tokenizes emphasis rules to account for CJK content, so bold and italic work correctly around ideographs and kana.

Example

The following renders correctly with emphasis markers adjacent to Japanese text:

これは **重要な** テキストです。
_イタリック_ も正しく機能します。

Disabling

In rare cases where strict CommonMark compliance is required, you can turn the feature off in zfb.config.ts:

export default defineConfig({
  markdown: {
    cjkFriendly: false,
  },
});

Omitting cjkFriendly (the default) keeps the feature on.

Notes

• GFM strikethrough (~~text~~) is handled independently by markdown-rs and is unaffected by this setting.

• The feature operates as an AST post-processor; it does not modify the base parser.