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CJK autolink boundary handling keeps `**` in the URL when a bold URL is followed by CJK punctuation

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#672 1 comentario 0 reacciones 0 asignados Ver en GitHub

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@mikemikimike ya está trabajando en esto.

Desde el 15/10/2026.

  • #674 de @mikemikimike — abierto

Evaluación

Dificultad
3/5
Tiempo estimado
Medio día
Aptitud para principiantes
50/100
Tipo de issue
Error
Claridad
Bastante claro
Estado de actividad
Activo
Stack tecnológico
react, typescript
Área
frontend, internationalization

Línea de trabajo

Start with the @streamdown/cjk autolink split introduced for #327 and check where it cuts the URL at fullwidth punctuation. Reproduce with the four table inputs, which should show bold plus a link to https://example.com/ for the spaced cases and no bold for the unspaced ones. Done means **https://example.com/**、英語版 renders a span wrapping the link, with no ** in the href, while the #326 and #327 cases still pass.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

bug
Bug Description

With @streamdown/cjk enabled, a bare URL wrapped in ** and immediately followed by fullwidth punctuation (e.g. 、, U+3001) renders with ** included in the link URL, and the bold is not applied.

@streamdown/cjk already cuts the autolink at the fullwidth punctuation (#327, fixing #326), so the rest of the sentence is no longer swallowed. However, the closing ** stays inside the link, so the emphasis is never formed. This looks like another case not covered by #327, similar to #623.

The underlying behavior is GFM's autolink literal rule, which remark-gfm follows as specified:

  1. The URL extends until whitespace or the end of the text.
  2. Only trailing ASCII punctuation (?, !, ., ,, :, *, _, ~) is trimmed from the end of that range.

In English this only happens when the space after the punctuation is missing (**URL**,then), which is rare. In CJK text, punctuation is not followed by a space, so it happens almost every time a bold URL is followed by a comma or period. Fullwidth punctuation is also not in the trimmed set, so adding a space after 、 does not help either.

Steps to Reproduce

Render the code sample below. mode="static" and mode="streaming" produce the same HTML, so this is not related to remend's incomplete-markdown handling.

Expected Behavior

The same output as when there is a space before 、 (attributes stripped; Streamdown renders bold as a span):

<p>日本語版は <span><a href="https://example.com/">https://example.com/</a></span>、英語版は別ページです。</p>
  • The link points to https://example.com/.
  • The bold is applied to the link.
  • 、英語版は別ページです。 is plain text.
Actual Behavior

With @streamdown/cjk (attributes stripped for readability):

<p>日本語版は **<a href="https://example.com/**">https://example.com/**</a>、英語版は別ページです。</p>

Without @streamdown/cjk, the link swallows the rest of the sentence (the #326 behavior):

<p>日本語版は **<a href="https://example.com/**%E3%80%81...">https://example.com/**、英語版は別ページです。</a></p>

The same rule applied to other inputs:

Input Result
See **https://example.com/**, then more bold + link to https://example.com/
See **https://example.com/**,then more link to https://example.com/**,then, no bold
日本語版は **https://example.com/** 、英語版 bold + link to https://example.com/
日本語版は **https://example.com/**、 英語版 link to https://example.com/**, no bold
Code Sample
import { Streamdown } from 'streamdown';
import { cjk } from '@streamdown/cjk';

const markdown = '日本語版は **https://example.com/**、英語版は別ページです。';

export default function App() {
  return <Streamdown plugins={{ cjk }}>{markdown}</Streamdown>;
}
Streamdown Version

streamdown 2.7.0; @streamdown/cjk 1.0.4

React Version

19.3.0

Node.js Version

24.21.0

Browser(s)

No response

Operating System

None

Additional Context

A possible fix in the autolink split from #327: when the URL is cut at fullwidth punctuation, also trim trailing * / _ / ~ from the URL and let the emphasis be formed, as GFM does for ASCII punctuation. Adding fullwidth punctuation to the trimmed set would also cover the case with a space after 、.

LLM output often bolds URLs in Japanese and Chinese, so this shows up regularly in chat UIs.

Lenguaje dominante
TypeScript
Estrellas
5.7k
Forks
307
Merge medio
1 d 22 h
PR fusionados (30 d)
22

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