Declared variable shouldn't be imported

Author: aminya

src/master/implementation.node.ts

@@ -10,7 +10,8 @@ import {
   ThreadsWorkerOptions,
   WorkerImplementation
 } from "../types/master"
-import { isWebpack, requireFunction, __non_webpack_require__ } from '../webpack-hack'
+import { isWebpack, requireFunction } from "../webpack-hack"
+export declare const __non_webpack_require__: typeof require
 
 interface WorkerGlobalScope {
   addEventListener(eventName: string, listener: (event: Event) => void): void

src/webpack-hack.ts

@@ -2,6 +2,6 @@
 
 // TODO remove webpack hacks. These hurt the performance for non-web-pack situations
 // Webpack hack
-export declare let __non_webpack_require__: typeof require
+declare const __non_webpack_require__: typeof require
 export const isWebpack = typeof __non_webpack_require__ === "function"
 export const requireFunction: typeof require = isWebpack ? __non_webpack_require__ : eval("require")

src/worker_threads.ts

@@ -1,5 +1,3 @@
-// TODO this file isn't used!
-
 // Webpack hack
 import { requireFunction } from './webpack-hack'