MARKLESS_ELEMENT_GUARD_RETURN_UNSUPPORTED

Element-valued guard returns are not supported: a Markless compiler error.

Error from the compiler, while it builds your .tsrx files.

What happened

Markless prints the message, the reason, and a suggestion:

MARKLESS_ELEMENT_GUARD_RETURN_UNSUPPORTED: <componentName> uses an element-valued guard return before its template root, so the public render plan cannot preserve both outcomes.
The public render module needs one planned component root with stable locators. An earlier element-valued return creates another root whose conditional statement flow is not represented by that plan.
Rewrite the two outcomes as a root-level @if/@else template, or use return null when the guard should render nothing.
https://markless.dev/errors/MARKLESS_ELEMENT_GUARD_RETURN_UNSUPPORTED

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How to fix it

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Where it comes from

@markless/compiler raises this code. Source:

• packages/compiler/src/passes/public-render/diagnostics.ts

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