vscode-jupyter does not show ANSI color codes when using the output widget

[raldone01]

Description

Ansi color codes are stripped and no color is shown in output captured by the output widget.

Reproduce

import ipywidgets as widgets

print("\033[91mHello World\033[0m")
output = widgets.Output()
output.append_stdout("\033[91mHello World\033[0m")
output

Expected behavior

Both lines are colored red.

Context

• ipywidgets version 8.1.5
• Operating System and version: WIN11
• Browser and version: VSCODE

[mvanderlee]

I think this is a VSCode issue.

If I change the representation to text I see the ANSI codes:

Output(outputs=({'output_type': 'stream', 'name': 'stdout', 'text': '\x1b[91mHello World\x1b[0m'},))

[mvanderlee]

It even has the right classes, but for some reason the style sheet appears to be missing:
https://github.com/jupyterlab/jupyterlab/blob/main/packages/rendermime/style/base.css#L126

[mvanderlee]

Workaround: Import the missing stylesheet manually.

from IPython.display import HTML
from urllib.request import urlopen
html = urlopen("https://raw.githubusercontent.com/jupyterlab/jupyterlab/refs/heads/main/packages/rendermime/style/base.css")
HTML(f"<style>{html.read().decode('utf-8')}</style>")

[raldone01]

Awesome thanks for tracking this down. I hope upstream vscode fixes this soon. Colorful logs here I come!