Auto-fix for callable-types removes export qualifier

[dphilipson]

Bug Report

• TSLint version: 5.4.3
• TypeScript version: 2.3.4
• Running TSLint via: VSCode

TypeScript code being linted

export interface Runnable {
    (): void;
}

with tslint.json configuration:

{
  "extends": "tslint:recommended",
}

Actual behavior

When running fix, the callable-types rule changes this to

type Runnable = () => void;

Expected behavior

It should preserve the export, changing this instead to

export type Runnable = () => void;