isClassConstructor Available since v0.7

The isClassConstructor() is able to determine if a value is a class constructor.

Caution

isClassConstructor() will only be able to return true for classes that are defined using the class keyword. See ES6 classes for additional information.

Built-in Classes

This util is NOT able to detect built-in classes. Use isConstructor() if you wish to test for "constructable" functions / classes, including built-in classes.

import { isClassConstructor } from "@aedart/support/reflections";

isClassConstructor(null); // false
isClassConstructor({}); // false
isClassConstructor([]); // false
isClassConstructor(function() {}); // false
isClassConstructor(() => {}); // false
isClassConstructor(Array); // false

class A {}
isClassConstructor(A); // true
isClassConstructor(class {}); // true

Acknowledgement

The source code of the above shown methods is heavily inspired by Denis Pushkarev's Core-js implementation of the Function.isCallable / Function.isConstructor proposal (License MIT).

See also isConstructor().