No it doesn't.

This may not be a popular opinion for those coming from C or Java, but runtime type checks in JavaScript are usually an anti-pattern. If my function defines a contract that the caller violates by passing in null or undefined, then my function should raise an exception when it tries to access `undefined.xyz` or whatever. Otherwise, embrace the duck! If the function can work with what it was given, it should instead of trying to enforce some Java-esque type system at runtime using typeof or instanceof.

But be pragmatic. If there is some critical area of your app that absolutely must never ever throw, typecheck away (although this is JS after all, so it still may throw if it damn well pleases).