[cardanome]

JS ist not typeless. In fact dynamic languages allow you to use very complex types that are not even possible to express in most static type systems. That is why TS needed to have such an advanced and complex type system to catch at least most of it's power.

You are right that dynamic typing is a valid style though and offers some great advantages but also disadvantages. That is why most dynamic languages have added gradual typing support to have the best of both worlds. The real issue is the weak typing in JS which is an design mistake in retrospect.