jsDoc support for defining type of 'this'

[akwotom]

For the sake of auto-complete, we sometimes do this

class SomeClass{
    constructor(){
        //For some reason, the constructor is returning a promise that when resolved will return a string
        /** @type {Promise<string>}*/ this
    }
}

//Somewhere else
let myInstance = new SomeClass()
// myInstance.th As we type 'myInstance.' we really want auto-complete that'll list the properties of a Promise<string>

[mjbvz]

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