Module is/constructor

isConstructor

• isConstructor(f: unknown): f is Constructor<unknown>

• Check if a function is a constructor

  https://stackoverflow.com/a/46759625

  example

   // true
   isConstructor(function(){});
   isConstructor(class A {});
   isConstructor(Array);
   isConstructor(Function);
   isConstructor(new Function);
  
   // false
   isConstructor();
   isConstructor(undefined);
   isConstructor(null);
   isConstructor(1);
   isConstructor(new Number(1));
   isConstructor(Array.prototype);
   isConstructor(Function.prototype);
   isConstructor(() => {})
   isConstructor({method() {}}.method)
  

  Parameters

  • f: unknown

    The function target to check

  Returns f is Constructor<unknown>

  Ture for constructor, False for not