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[Bug] Progress bar visibly flickers in Ptyxis 50.1 but not in Zed terminal

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Bewertung

Schwierigkeit
3/5
Geschätzter Aufwand
1-2 Tage
Anfängerfreundlichkeit
70/100
Issue-Typ
Bug
Klarheit
Größtenteils klar
Aktivitätsstatus
Aktiv
Tech-Stack
node.js, typescript
Bereich
cli

Rechercherichtung

Start by running the standalone repro.mjs script with @clack/[email protected] in Ptyxis and Zed, using both default output and --stderr; the issue reports flickering only in Ptyxis. Trace the progress animation and terminal output behavior in the package to identify what differs between the two terminals. Done means the progress updates no longer show a blank interval in the reported reproduction.

Vom Indexierungsmodell aus dem Issue-Text verfasst.

Beschreibung

Environment

  • OS: Linux
  • Node.js: v24.13.0
  • Package: @clack/prompts
  • Package version: 1.8.1
  • Affected terminal: Ptyxis 50.1
  • GTK: 4.22.5 (compiled against 4.22.4)
  • VTE: 0.84.1 (compiled against 0.84.0)

Describe the bug

The entire progress line briefly disappears and reappears during animation in Ptyxis, producing visible rapid flickering/strobing. This is not just the spinner changing frames, repeated output, or the line moving onto another row.

The same standalone script does not visibly flicker in Zed's integrated terminal. Both stdout and stderr exhibit the issue in Ptyxis, while neither visibly flickers in Zed.

To reproduce

This reproduction uses only Clack, with short messages and no network requests during execution.

  1. Create a standalone project:

    mkdir clack-repro
    cd clack-repro
    npm init -y
    npm install @clack/[email protected]
    
  2. Save the following as repro.mjs:

    import { progress } from '@clack/prompts'
    
    const bar = progress({
      max: 5,
      indicator: 'timer',
      withGuide: false,
      ...(process.argv.includes('--stderr') ? { output: process.stderr } : {}),
    })
    
    bar.start('Translating')
    
    try {
      for (let completed = 1; completed <= 5; completed++) {
        await new Promise((resolve) => setTimeout(resolve, 2000))
        bar.advance(1, `Translated ${completed}/5`)
      }
      bar.stop('Done')
    } finally {
      bar.clear()
    }
    
  3. Run in Ptyxis with a terminal at least 80 columns wide, without piping or redirecting output:

    node repro.mjs
    node repro.mjs --stderr
    
  4. Compare the same commands in Zed's integrated terminal.

Terminal Default stdout --stderr
Ptyxis 50.1 Visible flickering Visible flickering
Zed integrated terminal No visible flickering No visible flickering

Expected behavior

The progress animation updates without a visibly blank interval between frames.

Vorherrschende Sprache
TypeScript
Sterne
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Forks
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Ø Merge
1 T. 10 Std.
Gemergte PRs (30 T.)
4

Entwicklungsumgebung

Erste Schritte

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  2. Schreiben Sie ins Issue, dass Sie es übernehmen — das erspart doppelte Arbeit.
  3. Forken Sie das Repository und arbeiten Sie in einem Branch.
  4. Öffnen Sie einen Pull Request, der die Issue-Nummer nennt.

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