This condition will always return 'false' since the types '() => boolean' and-CodePudding

I have a typescript function which looks like:

const doesContainProduct = () => {
    if (cart.length >= 1 ) {
        return true
    } else {
        return false;
    }
}

I am referencing the above function like this:

if (doesContainProduct === true) {
    return null;
}

And I am getting the following error:

TS2367: This condition will always return 'false' since the types '() => boolean' and 'boolean' have no overlap.
  > 136 |             if (doesContainProduct === true) {
        |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    137 |                 return null;
    138 |             } else {
    139 |                 alert("Yes");

This looks very straightforward to me, but don't know why this is happening. Any explanation on this would be beneficial.

CodePudding user response：

Call the function.

if (doesContainProduct()) {
    return null;
}

(also don't compare boolean values to true and false; just use them like the boolean values they are)

CodePudding user response：

You want to make a variable of the value of that functiont then you can get the value===>

const doesContainProduct = (cart) => {
    cart = "1";
    if (cart.length >= 1 ) {
        return true;
    } else {
        return false;
    }
}

let test = doesContainProduct();

if(test === true){
    console.log("It is true")
}
else{
    console.log("It is false")
}