为什么 Google Maps Map() 构造函数有副作用？

Question

I've been working a personal Vue project that includes a simple Google map.

While implementing the Maps JS API , I annoyingly kept encountering the ESLint error 'map' is assigned a value but never used . I understand why I'm getting this error—The Map() constructor returns a value that I don't need to do anything with:

const map = new google.maps.Map(el, options)

So I eventually just implemented the solution described in this Stack Overflow answer to bypass the lint rule.

If you're using a poorly designed library where the class constructor has side effects (which it isn't supposed to), and you don't need to do anything with the returned value from the class, I would disable that specific eslint rule for those lines.

However, my question is, why is Google's Map() constructor designed in this way? I have a hard time believing this library would be "poorly designed" but can't see a reason for this implementation.

Answer 1

It not side effect. It's returning instance of it. So you can call further methods on it