"Quick info" and "go to definition" not working inside old school JavaScript constructor functions

[jakub-g]

Perhaps related to #55910

• VSCode Version: 1.26.1 stable, 1.27.0 insiders
• OS Version: Win 10
  Does this issue occur when all extensions are disabled?: Yes

Steps to Reproduce:

1. Create JS file with contents like this (this kind of constructions are quite often used in old school mixin-based frameworks)

function MyAwesomeConstructor() {
  /**
   * @return {Number} Always 42
   */
  this.foo = function() {
    return 42
  }

  this.bar = function() {
    this.foo()
  }
}

const myObject = new MyAwesomeConstructor()

2. Hover line 10: this.foo() call

Expected:

• On hover, quick info with the this.foo jsdoc from the beginning of the file is displayed
• On Ctrl+clicking on foo(), the editor should move me to the definition

Actual:

• Quick info stating any is displayed
• Not possible to Ctrl+click

Note: When you write myObject. and do CTRL_SPACE, both foo and bar are correctly suggested.

[mjbvz]

This issue was moved to microsoft/TypeScript#26666