CJK Language Support

vue-stream-markdown includes built-in support for CJK (Chinese, Japanese, Korean) languages, ensuring that emphasis markers like bold and italic work correctly with ideographic punctuation. This is particularly important for AI-generated content, where language models naturally place emphasis markers around phrases that include or end with punctuation.

The Problem

The CommonMark/GFM specification has a limitation where emphasis markers (*or) adjacent to ideographic punctuation marks occasionally fail to be recognized. This causes formatting to break in CJK text:

**この文は太字になりません（This won't be bolded）。**この文のせいで（It is due to this sentence）。

Without CJK-friendly parsing, the text above would render as plain text instead of bold because the closing ** appears next to the Japanese period.

The Solution

Vue Stream Markdown combines Comark's Markdown parser with Markmend's streaming delimiter analysis. The completion layer treats CJK letters consistently with other Unicode letters and avoids inventing emphasis solely because a partial stream currently ends beside an asterisk, underscore, or tilde.

Character Animation

Streaming animations use animationSplit="auto" by default. CJK characters are split individually, while nearby non-CJK text keeps word-based animation. Set animationSplit to 'char' when you want to force character animation:

<StreamMarkdown
  content="CJK text can animate character by character."
  animation-split="char"
/>

New animation units in a received batch start within 40ms of each other by default. Faster streams shorten this window to follow the arrival cadence without accumulating a playback queue. Use animationStagger to change the maximum batch window, or set it to 0 to reveal each received batch at once:

<StreamMarkdown
  content="中文和 English can share one animation sequence."
  animation-split="auto"
  :animation-stagger="30"
/>

Supported Features

Bold Text with Punctuation

Works correctly with all ideographic punctuation marks:

**日本語の文章（括弧付き）。**この文が後に続いても大丈夫です。
**中文文本（带括号）。**这句子继续也没问题。
**한국어 구문(괄호 포함)**을 강조.

Italic Text with Punctuation

*これは斜体のテキストです（括弧付き）。*この文が後に続いても大丈夫です。
*这是斜体文字（带括号）。*这句子继续也没问题。
*이 텍스트(괄호 포함)*는 기울임꼴입니다.

Strikethrough with Punctuation

The same delimiter rules apply to strikethrough:

~~削除されたテキスト（括弧付き）。~~この文は正しいです。
~~删除的文字（带括号）。~~这个句子是正确的。
~~이 텍스트(괄호 포함)~~를 삭제합니다.

Mixed Content

CJK and English text work seamlessly together:

**重要提示（Important Notice）：**请注意。