JSDoc: How to document a type that is either Object or null?

Question

If I have a parameter of type Object or null, should I document it as {Object} or {?Object} or {Object|null}?

I read https://jsdoc.app/tags-type.html and it says {?number} means either a number or null, but I'm not sure if I need this for objects, or just primitives.

Answer 1

In javascript, you can use the optional chaining like element?.addEventListener() to check for null or not. So because of this, it's more intuitive for {?Object}. Just make sure that it is actually accepting null and not undefined. They have separate meanings.