Reactjs hook that uses other hooks - reactjs

Question

I needed to create a custom hook which is supposed to contain all the handlers that will be used everywhere in my page. My requirements were;
Handlers are supposed to be accessible from all the components in the page
Handlers should be able to use other hooks, like useContext
So, created a useHandlers hook sandbox
However, couldn't make the LogHandler accessible from the page, receving LogHandler is not a function
Any idea?

Answer 1

The issue why you're getting LogHandler is not a function is because it's undefined and it doesn't get initialized until HandlerComp gets called:
export const userHandlers = (): IUseHandlers => {
// initialization skipped, so `LogHandler` is undefined
let LogHandler: () => void;
const HandlersComp: React.FunctionComponent<HandlersProps> = (
props: HandlersProps
) => {
// initialized here, but that's after `HandlersComp` gets caled
LogHandler = () => {
console.log("Hi from LogHandler");
};
return <></>;
};
return { HandlersComp, LogHandler };
}
I suggest you move the initialization step from HandlersComp like so:
export const useHandlers = (): IUseHandlers => {
const LogHandler: () => void = () => {
console.log("Hi from LogHandler");
};
const HandlersComp: React.FunctionComponent<HandlersProps> = (
props: HandlersProps
) => {
LogHandler()
return <></>;
};
return { HandlersComp, LogHandler };
};
Some notes:
HandlersComp looks like it should be a separate and reusable component, rather than a hook
LogHandler also looks more like a utility function, rather than a hook
LogHandler shouldn't be using PascalCase for naming as that should be "reserved" for React components; HandlersComp is fine, since it looks like it's a component