Revert "Merge pull request #161 from overleaf/em-upgrade-node-12"

This reverts commit d44102751b9436ad89c5b3b05e7abdff51fcc78a, reversing
changes made to 6c2f5b8d053b75c677da2b7ddd04f998d2be6fff.

services/document-updater/test/unit/js/ProjectManager/getProjectDocsTests.js

@@ -11,6 +11,8 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 const sinon = require('sinon')
+const chai = require('chai')
+const should = chai.should()
 const modulePath = '../../../../app/js/ProjectManager.js'
 const SandboxedModule = require('sandboxed-module')
 const Errors = require('../../../../app/js/Errors.js')
@@ -23,6 +25,10 @@ describe('ProjectManager - getProjectDocsAndFlushIfOld', function () {
         './RedisManager': (this.RedisManager = {}),
         './ProjectHistoryRedisManager': (this.ProjectHistoryRedisManager = {}),
         './DocumentManager': (this.DocumentManager = {}),
+        'logger-sharelatex': (this.logger = {
+          log: sinon.stub(),
+          error: sinon.stub()
+        }),
         './HistoryManager': (this.HistoryManager = {}),
         './Metrics': (this.Metrics = {
           Timer: (Timer = (function () {