MARKLESS_EVENT_HANDLER_NOT_A_FUNCTION
An event prop like onClick gets a value instead of a function.
Error from the compiler, while it builds your .tsrx files.
What happened
An event prop needs a function. This one gets the result of an expression, which runs once during render.
Markless prints the message, the reason, and a suggestion:
MARKLESS_EVENT_HANDLER_NOT_A_FUNCTION: `<attributeName>={<source>}` passes the result of `<source>`, not a function. The expression would run once while rendering, and the click would receive a number.
An event prop compiles to a lazy handler symbol that runs on the browser event; only a function can be that handler.
Wrap it in a function, for example <attributeName>={() => <source>}.
https://markless.dev/errors/MARKLESS_EVENT_HANDLER_NOT_A_FUNCTIONWords in angle brackets change from case to case.
How to fix it
Wrap the expression in an arrow function.
<button onClick={() => count++}>Add</button>Where it comes from
@markless/compiler raises this code. Source:
Read how to read a Markless error, or go back to all error codes.