Add a return type of string when a function is accessed like a variable

Question

I am not sure if this is possible (in fact I\'m struggling to work out what to google for) but here it goes:

I have a function

const test = () => {
           


        

Answer 1

You can do this if you first check the type of the variable, in particular you will check if its a Function:

function isFunc(functionToCheck) {
 return functionToCheck && {}.toString.call(functionToCheck) === '[object Function]';
};

So if this is true, then your variable is infact a function and you can return the stuff you need from it:

const isItAFunction = somevariable;

if(isFunc(isItAFunction)) {
   // return your string
} else {
  // do something else
}