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

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#613 4 comentários 0 reações 0 responsáveis Ver no GitHub

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Avaliação

Dificuldade
3/5
Tempo estimado
1-2 dias
Facilidade para iniciantes
70/100
Tipo de issue
Bug
Clareza
Razoavelmente clara
Status de atividade
Ativa
Stack de tecnologia
node.js, typescript
Domínio
cli

Direção de pesquisa

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.

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Descrição

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.

Linguagem predominante
TypeScript
Estrelas
8.1k
Forks
226
Merge médio
1d 10h
PRs com merge (30d)
4

Preparar o ambiente

Primeiros passos

  1. Leia a issue inteira e depois o guia de contribuição do projeto.
  2. Comente na issue dizendo que vai assumir — evita que duas pessoas façam o mesmo trabalho.
  3. Faça um fork do repositório e trabalhe em uma branch.
  4. Abra um pull request que referencie o número da issue.

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