MARKLESS_BARE_ARM_INTERPOLATION

A branch arm renders a bare expression instead of a fragment: 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_BARE_ARM_INTERPOLATION: `{<expressionSource>}` stands alone as this arm's whole body. A standalone expression container is not a template output node, so the arm has no markup of its own and its text has nowhere to live but the element around it — which erases whatever the other arm rendered there.
Template output is an element, a fragment, or a control-flow construct. A statement container that needs to render text says so with a fragment, which gives the text its own marker range inside the arm.
Wrap it in a fragment: <wrapped>
https://markless.dev/errors/MARKLESS_BARE_ARM_INTERPOLATION

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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/semantic-graph/diagnostics.ts

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