fix: lazy-load log4js

Author: aminya

lib/debugger/utils.js

@@ -12,7 +12,6 @@ import { Observable } from "rxjs-compat/bundles/rxjs-compat.umd.min.js"
 import { track } from "@atom-ide-community/nuclide-commons/analytics"
 import * as RemoteDebuggerCommandServiceLocal from "./RemoteDebuggerCommandService"
 import nullthrows from "nullthrows"
-import { getLogger } from "log4js"
 
 let _rpcService: ?nuclide$RpcService = null
 
@@ -52,6 +51,7 @@ export function listenToRemoteDebugCommands(): IDisposable {
     const rootUri = hostname === "local" ? "" : nuclideUri.createRemoteUri(hostname, "/")
     const service = getRemoteDebuggerCommandServiceByNuclideUri(rootUri)
     if (service == null) {
+      const { getLogger } = require("log4js")
       getLogger().error("null remote command service for uri:", rootUri)
       return Observable.empty()
     } else {