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

Aperta
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#672 1 commento 0 reazioni 0 assegnatari Vedi su GitHub

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Dal 15/10/2026.

  • #674 di @mikemikimike — aperta

Valutazione

Difficoltà
3/5
Tempo stimato
Mezza giornata
Idoneità per principianti
50/100
Tipo di issue
Bug
Chiarezza
Abbastanza chiara
Stato di attività
Attiva
Stack tecnologico
react, typescript
Ambito
frontend, internationalization

Direzione di ricerca

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.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

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.

Lingua principale
TypeScript
Stelle
5.7k
Fork
313
Merge medio
1g 19h
PR unite (30g)
24

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