Convert backend code to ES modules

Bundling code now with Rollup for its flat bundling and tree shaking
support. Front end code still goes through Webpack for browser support.

lib/soap.js

@@ -18,11 +18,11 @@
  */
 "use strict";
 
-const libxmljs = require("libxmljs");
+import libxmljs from "libxmljs";
+import * as config from "./config";
+import { version as VERSION } from "../package.json";
 
-const config = require("./config");
-
-const SERVER_NAME = `GenieACS/${require("../package.json").version}`;
+const SERVER_NAME = `GenieACS/${VERSION}`;
 
 const NAMESPACES = {
   "1.0": {
@@ -518,7 +518,7 @@ function fault(xml) {
   return { faultCode, faultString, detail };
 }
 
-function request(data, cwmpVersion, warn) {
+export function request(data, cwmpVersion, warn) {
   warnings = warn;
 
   const rpc = {
@@ -642,7 +642,7 @@ function createSoapEnv(cwmpVersion) {
   return env;
 }
 
-function response(rpc) {
+export function response(rpc) {
   const headers = {
     Server: SERVER_NAME,
     SOAPServer: SERVER_NAME
@@ -716,6 +716,3 @@ function response(rpc) {
     data: env.doc().toString(LIBXMLJS_SAVE_OPTIONS)
   };
 }
-
-exports.request = request;
-exports.response = response;