Watch-mode does not work in a specific situation

[konekotech]

Version of Marp Tool

Marp CLI v4.1.1

Operating System

macOS

Environment

• OS version: macOS Sequoia 15.2
• Node.js version: Node.js 22.11.0

How to reproduce

1. Create a markdown and a CSS file in Vim / NeoVIm (e.g: slide.md and theme.css)
2. Edit and save
3. Open another tab in the terminal, and run marp ./slide.md --theme ./theme.css --preview
4. Edit markdown file again, and save

Expected behavior

Saving will be reflected on the preview window.

Actual behavior

Saving is not reflected on the preview window. It does not change.

Additional information

When I tried this in VS Code terminal (using Marp-CLI, not VSCode extention one), the saving was reflected on preview window.
However, when I use another terminals such as WezTerm and iTerm2, this issue occured.

[yhatt]

I have tried to reproduce on iTerm2, and I met only first once that the file change event was not fired. When tried the exactly same operation after logged out from macOS, I've confirmed that the file change event is correctly tracking in all of 4-5 times try. Probably it would mean that the difference of using terminal emulator is not root cause of that issue.

Some issues about watching file system has been reported before, but any issue was not resolved clearly.

• Watch mode does not work when the file is momentarily deleted then re-created #498
• Watchmode does not watch .md anymore (with custom css) ? #267
• --watch (and preview, server) discard custom separate style sheet after on live updates (style sheet is only considered correctly on first translation) #584