Detect if a function is a constructor

is-constructable.js

// https://stackoverflow.com/a/46759625

function isConstructable(fn) {
    try {
        Reflect.construct(function () {}, [], fn);
        return true;
    } catch (e) {
        return false;
    }
}

// Usage:

isConstructable(Array);                         //=> true
isConstructable(Function);                      //=> true
isConstructable(class {});                      //=> true
isConstructable(class {}.bind());               //=> true
isConstructable(function() {});                 //=> true
isConstructable(function() {}.bind());          //=> true
isConstructable(new Function());                //=> true

isConstructable(() => {});                      //=> false
isConstructable((() => {}).bind());             //=> false
isConstructable(async () => {});                //=> false
isConstructable(async function() {});           //=> false
isConstructable(function * () {});              //=> false
isConstructable({ foo() {} }.foo);              //=> false
isConstructable(Function.prototype);            //=> false