MARKLESS_CALLBACK_SLOT_SOURCE_UNSUPPORTED
A callback slot can only be filled by the widget root’s own callback prop: 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_CALLBACK_SLOT_SOURCE_UNSUPPORTED: "<componentName>" assigns <valueSource> into the "<slotName>" callback slot of shared() "<definitionName>", and <valueSource> is not one of this component's callback props.
A callback slot is a compile-time route, not a stored value: the build records that this widget root’s callback prop answers the slot, and a part invoking the slot dispatches straight to the consumer’s handler. A local function has no consumer to route to, so nothing could be recorded and the call would silently do nothing.
Declare the handler as a prop of <componentName> and assign that prop: <slotName> = <thatProp>.
https://markless.dev/errors/MARKLESS_CALLBACK_SLOT_SOURCE_UNSUPPORTEDWords in angle brackets change from case to case.
How to fix it
Start with the suggestion in the message above.
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Where it comes from
@markless/compiler raises this code. Source:
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