TypeScript Organize Imports removes aliased imported types that are in use

[AustonZ]

Issue Type: Bug

1. Create a new TS project that uses an NPM package, such as "typescript"
2. Create a TS file that imports a type from that package, aliasing it to a different name. Use that aliased type in the code. E.g.:

import { BaseType as Foo } from "typescript";
const x: Foo = null;

3. SHIFT+ALT+O (or CTRL+SHIFT+P, TypeScript: Organize Imports)

Expect:
No changes

Actual:
The import line is removed, and the code no longer compiles.

VS Code version: Code 1.22.1 (950b8b0, 2018-04-06T02:26:57.615Z)
OS version: Windows_NT x64 10.0.14393

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-7600U CPU @ 2.80GHz (4 x 2904)
Memory (System)	15.84GB (8.69GB free)
Process Argv	C:\Program Files\Microsoft VS Code\Code.exe
Screen Reader	no
VM	0%

Extensions: none

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• TypeScript and JavaScript organize imports (#45108)
• Test organize imports (#46589)

[mjbvz]

Duplicate of microsoft/TypeScript#22743

Should already be fixed in vscode insiders