MARKLESS_BEHAVIOR_SYMBOL_EMIT_UNSUPPORTED

This element behavior cannot run in the browser yet: 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_BEHAVIOR_SYMBOL_EMIT_UNSUPPORTED: Cannot emit lazy behavior symbol "<symbolId>" because it reads component-local "<name>", a local <bindingKindLabel> value that cannot cross a resume boundary.
Element behavior symbols run after browser resume. Behavior factories may use module functions, graph inputs, element handles, props/shared values, or serializable capture-plane inputs; unsupported body locals would otherwise become missing behavior code.
https://markless.dev/errors/MARKLESS_BEHAVIOR_SYMBOL_EMIT_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/capture-analysis.ts

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