Live-reload displays blank page on Windows 10 about dataflow

[asg017]

Thanks for the detailed report!

I'll look into this. At worst, I'll add a new option like --update-delay 100 or something if there isn't a straightforward fix, but Dataflow uses chokidar under the hood for this, so I would be surprised if there wasnt a better solution

[pingemi]

Absolutely! And dataflow seems really nice (still exploring it!)

Good call on Chokidar; looks like it has an "awaitWriteFinish" option (default: off) that solves the problem by internally debouncing. Unfortunately the default debounce time is 2 seconds! Can override the default to 50ms like this:

{'awaitWriteFinish': {'stabilityThreshold':50}}

Figured I'd see what VS Code does. Interestingly while VS Code uses Chokidar for file watching on Unix/MacOS targets, it uses a C# helper app instead for Win32. This app has a 50mS debounce time:

https://github.com/microsoft/vscode-filewatcher-windows/blob/main/FileWatcher/EventProcessor.cs#L15

[tstodter]

Just general FYI I've been having the same issue on VS Code (it's bad enough to make Dataflow unusable) but did verify that changing

dataflow/src/run.js

Line 156 in 8c96fba

chokidar.watch(notebookPath).on("all", (event, notebookPath) => {

to

chokidar.watch(notebookPath, {awaitWriteFinish: {stabilityThreshold: 50, pollInterval: 50}})

solves the issue perfectly every time.

I can look into making a PR for this if it would be helpful.