Somethings feels wrong with Fable console output (logs are not added in the correct place)

[MangelMaxime]

Description

I don't know what changed but when running processus in parallels like Vite + Fable, I feel like something has changed.

You can see on the video below that at first Fable output the log in the correct place, and then when it reports on the compilation status it prints at the top of the console and probably even a bit above.

CleanShot.2024-01-12.at.17.37.57.mp4

Repro code

Any code that launch Fable and Vite in parallel from a .NET project / script.

You can for example do it using Fun.Build.

#r "nuget: Fun.Build, 1.0.5"

open Fun.Build

pipeline "Watch" {

    stage "Watch" {
        workingDir  "demo"
        paralle

        run "dotnet fable --watch --sourceMaps --noCache"
        run "npx vite"
    }

    runIfOnlySpecified
}

tryPrintPipelineCommandHelp ()

Expected and actual results

Logs should be printed at the end of the console (I am pretty sure it was doing that before).

A workaround is to use --verbose flag which switch Fable into a mode which doesn't rewrite the console lines.

Related information

• Fable version: 4.9.0
• Operating system: OSX