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Strong ending in nested emphasis (`**bold *italic***`) closes early and leaves a literal `*`

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  • ¿Algo no está bien?
#32 0 comentarios 0 reacciones 0 asignados Ver en GitHub

Nadie ha tomado este issue todavía.

Evaluación

Dificultad
4/5
Tiempo estimado
3-5 días
Aptitud para principiantes
48/100
Tipo de issue
Error
Claridad
Bastante claro
Estado de actividad
Activo
Stack tecnológico
markdown, typescript
Área
backend

Línea de trabajo

Start at the Markdown emphasis parsing entry point and its tests; the issue does not name specific files, so first locate how delimiter runs are matched. Reproduce the nested and flanking cases from the report and compare output with micromark 4.0.2. Done means all listed inputs produce the expected CommonMark HTML, including the already working reverse nesting case.

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

Descripción

Summary

When a strong span ends with a nested emphasis span, so that the closing run is ***, @tanstack/markdown closes the <strong> early and leaves a literal * behind. The reverse case (*outer **inner***) already works.

This is common in real content. MDXEditor's Markdown serializer, for example, writes bold text ending in an italic title exactly as **25 years of *Title***, so content produced by that editor renders with stray asterisks.

Environment
  • @tanstack/markdown 1.0.0, renderHtml from @tanstack/markdown/html. The React adapter shows the same output.
  • Node 24
  • Reference: micromark 4.0.2 (CommonMark)
Reproduction
import { renderHtml } from '@tanstack/markdown/html'

renderHtml('**bold *italic***')
renderHtml('**25 years of *Title***, the debut album.')
renderHtml('***Iceman*, *Maid of Honour* and *Habibti***')
Input @tanstack/markdown 1.0.0 micromark 4.0.2 (expected)
**bold *italic*** <p><strong>bold *italic</strong>*</p> <p><strong>bold <em>italic</em></strong></p>
**25 years of *Title***, the debut album. <p><strong>25 years of *Title</strong>*, the debut album.</p> <p><strong>25 years of <em>Title</em></strong>, the debut album.</p>
***Iceman*, *Maid of Honour* and *Habibti*** <p><em><strong>Iceman<em>, </em>Maid of Honour<em> and </em>Habibti</strong></em></p> <p><strong><em>Iceman</em>, <em>Maid of Honour</em> and <em>Habibti</em></strong></p>
*outer **inner*** (works) <p><em>outer <strong>inner</strong></em></p> same
Related flanking cases (in addition to #28)

#28 covers a * with whitespace on both sides. These two variants also open or close where CommonMark does not:

Input @tanstack/markdown 1.0.0 micromark 4.0.2 (expected)
**VIP pass **: entry included <p><strong>VIP pass </strong>: entry included</p> <p>**VIP pass **: entry included</p>
Seats CSI5* and CSI1*, both sold <p>Seats CSI5<em> and CSI1</em>, both sold</p> <p>Seats CSI5* and CSI1*, both sold</p>
  • First row: the closing ** is preceded by whitespace, so it is not right-flanking.
  • Second row: the first * is followed by whitespace, so it is not left-flanking.
Context

We compared @tanstack/markdown against a corpus of about 4,000 real Markdown documents. These emphasis cases account for most of the visible differences. They are the only thing blocking us from adopting it.

Lenguaje dominante
TypeScript
Estrellas
432
Forks
11
Merge medio
57 min
PR fusionados (30 d)
4

Preparar el entorno

Primeros pasos

  1. Lee el issue completo y luego la guía de contribución del proyecto.
  2. Comenta en el issue que vas a ocuparte — evita que dos personas hagan lo mismo.
  3. Haz un fork del repositorio y trabaja en una rama.
  4. Abre un pull request que haga referencia al número del issue.

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