Avoid eagerly importing nock outside of testing

index.js

@@ -1,16 +1,7 @@
 'use strict';
 
-let resolve = require('resolve');
-let minimist = require('minimist');
-
-let {
-  createCleanUpMocks,
-  createFastbootEcho,
-  createFastbootTest,
-  createMockRequest,
-  reloadServer,
-  createServer,
-} = require('./lib/helpers');
+const resolve = require('resolve');
+const minimist = require('minimist');
 
 module.exports = {
   name: require('./package').name,
@@ -48,6 +39,8 @@ module.exports = {
 
   // we have to use the outputReady hook to ensure that ember-cli has finished copying the contents to the outputPath directory
   outputReady(result) {
+    const { reloadServer, createServer } = require('./lib/helpers');
+
     const isEnabled =
       this.app.name === 'dummy' || this.app.env !== 'production';
 
@@ -69,6 +62,13 @@ module.exports = {
   },
 
   _fastbootRenderingMiddleware(app) {
+    const {
+      createCleanUpMocks,
+      createFastbootEcho,
+      createFastbootTest,
+      createMockRequest,
+      createServer,
+    } = require('./lib/helpers');
     createMockRequest(app);
     createCleanUpMocks(app);
     createFastbootTest(app, ({ res, options, urlToVisit }) => {

lib/helpers.js

@@ -2,20 +2,27 @@
 
 const fs = require('fs');
 const path = require('path');
-const nock = require('nock');
 const { URL } = require('url');
 const JSONfn = require('json-fn');
 const FastBoot = require('fastboot');
 const bodyParser = require('body-parser');
 const { deprecate } = require('util');
 
+let _nock;
+function getNock() {
+  if (!_nock) {
+    _nock = require('nock');
+  }
+  return _nock;
+}
+
 function createMockRequest(app) {
   app.post(
     '/__mock-request',
     bodyParser.json({ limit: '50mb' }),
     (req, res) => {
       const requestOrigin = req.body.origin || req.headers.origin;
-      let mock = nock(requestOrigin)
+      let mock = getNock()(requestOrigin)
         .persist()
         .intercept(req.body.path, req.body.method)
         .reply(
@@ -31,7 +38,7 @@ function createMockRequest(app) {
 
 function createCleanUpMocks(app) {
   app.use('/__cleanup-mocks', (req, res) => {
-    nock.cleanAll();
+    getNock().cleanAll();
 
     res.json({ ok: true });
   });