lint rule: check for branching expressions

[dmadisetti]

📝 Summary

Adds common genai mistake where the last expression is expected to conditionally show if nested in an expression. Example:

if condition:
    mo.md("Condition was true")
else:
    mo.md("Condition was false")

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Project	Deployment	Preview	Comments	Updated (UTC)
marimo-docs	Ready	Preview	Comment	Nov 25, 2025 3:15pm

[mscolnick]

nice rule!

[mscolnick]

it seems like there are a few false-positives. maybe we can special case mo.md or all mo.ui (except mo.output, mo.stop)

[dmadisetti]

(except mo.output, mo.stop)

This is a good diea

[mscolnick]

it might be worth capturing a valid use-cases as well in here:

• mo.output
• mo.stop
• sys.*

[mscolnick]

nice!