In my current Angular project, I am attempting to call the following function:
updateFn: () => (val: boolean) => void;
I have tried invoking it like so:
this.updateFn()(true);
However, I consistently receive a
this.updateFn(...) is not a functionNot a function may result in a runtime error, indicating that it is a JavaScript issue rather than a TypeScript compilation problem.
In your scenario, you've simply defined a type annotation for updateFn, without assigning any actual value to it, leading to it being perceived as undefined.
updateFn = () => (val: boolean) => void;
The correction involves changing the first : to =.
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