Javascript: Organize imports removes alias

[IceSentry]

• VSCode Version: 1.22.2
• OS Version: Windows 10 enterprise (1709)

Steps to Reproduce:

1. use https://github.com/mobxjs/mobx-react-boilerplate to create a sample project
2. in Todo.jsx change
   import { observer } from "mobx-react";
   to
   import { observer, PropTypes as mobxPropTypes } from "mobx-react";
3. add
   const propTypes = { test: mobxPropTypes.observableArray }
// rest of the code
Todo.propTypes = propTypes;
4. Organize imports

Expected behaviour:

PropTypes as mobxPropTypes is still there and works

Current behaviour:

PropTypes as mobxPropTypes is removed even if it was used

Does this issue occur when all extensions are disabled?: Yes

I use this pattern often when using mobx because I sometimes need normal PropTypes from prop-types and the PropTypes from mobx-react. Since the names are conflicting I need to use an alias, but it then gets removed by the organize imports feature.

[mjbvz]

Duplicate of #47310. Should be fixed in insiders