diff --git a/services/document-updater/app/js/HttpController.js b/services/document-updater/app/js/HttpController.js
index 8c2501fdbe..800aee4c44 100644
--- a/services/document-updater/app/js/HttpController.js
+++ b/services/document-updater/app/js/HttpController.js
@@ -2,13 +2,6 @@
     camelcase,
     handle-callback-err,
 */
-// TODO: This file was created by bulk-decaffeinate.
-// Fix any style issues and re-enable lint.
-/*
- * decaffeinate suggestions:
- * DS207: Consider shorter variations of null checks
- * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
- */
 let HttpController
 const DocumentManager = require('./DocumentManager')
 const HistoryManager = require('./HistoryManager')
@@ -25,15 +18,12 @@ const TWO_MEGABYTES = 2 * 1024 * 1024
 module.exports = HttpController = {
   getDoc(req, res, next) {
     let fromVersion
-    if (next == null) {
-      next = function (error) {}
-    }
     const { doc_id } = req.params
     const { project_id } = req.params
     logger.log({ project_id, doc_id }, 'getting doc via http')
     const timer = new Metrics.Timer('http.getDoc')
 
-    if ((req.query != null ? req.query.fromVersion : undefined) != null) {
+    if (req.query.fromVersion != null) {
       fromVersion = parseInt(req.query.fromVersion, 10)
     } else {
       fromVersion = -1
@@ -45,7 +35,7 @@ module.exports = HttpController = {
       fromVersion,
       function (error, lines, version, ops, ranges, pathname) {
         timer.done()
-        if (error != null) {
+        if (error) {
           return next(error)
         }
         logger.log({ project_id, doc_id }, 'got doc via http')
@@ -73,11 +63,8 @@ module.exports = HttpController = {
   },
 
   getProjectDocsAndFlushIfOld(req, res, next) {
-    if (next == null) {
-      next = function (error) {}
-    }
     const { project_id } = req.params
-    const projectStateHash = req.query != null ? req.query.state : undefined
+    const projectStateHash = req.query.state
     // exclude is string of existing docs "id:version,id:version,..."
     const excludeItems =
       req.query.exclude != null ? req.query.exclude.split(',') : []
@@ -100,7 +87,7 @@ module.exports = HttpController = {
         timer.done()
         if (error instanceof Errors.ProjectStateChangedError) {
           res.sendStatus(409) // conflict
-        } else if (error != null) {
+        } else if (error) {
           next(error)
         } else {
           logger.log(
@@ -117,15 +104,12 @@ module.exports = HttpController = {
   },
 
   clearProjectState(req, res, next) {
-    if (next == null) {
-      next = function (error) {}
-    }
     const { project_id } = req.params
     const timer = new Metrics.Timer('http.clearProjectState')
     logger.log({ project_id }, 'clearing project state via http')
     ProjectManager.clearProjectState(project_id, function (error) {
       timer.done()
-      if (error != null) {
+      if (error) {
         next(error)
       } else {
         res.sendStatus(200)
@@ -134,9 +118,6 @@ module.exports = HttpController = {
   },
 
   setDoc(req, res, next) {
-    if (next == null) {
-      next = function (error) {}
-    }
     const { doc_id } = req.params
     const { project_id } = req.params
     const { lines, source, user_id, undoing } = req.body
@@ -162,7 +143,7 @@ module.exports = HttpController = {
       undoing,
       function (error) {
         timer.done()
-        if (error != null) {
+        if (error) {
           return next(error)
         }
         logger.log({ project_id, doc_id }, 'set doc via http')
@@ -172,9 +153,6 @@ module.exports = HttpController = {
   }, // No Content
 
   flushDocIfLoaded(req, res, next) {
-    if (next == null) {
-      next = function (error) {}
-    }
     const { doc_id } = req.params
     const { project_id } = req.params
     logger.log({ project_id, doc_id }, 'flushing doc via http')
@@ -183,7 +161,7 @@ module.exports = HttpController = {
       error
     ) {
       timer.done()
-      if (error != null) {
+      if (error) {
         return next(error)
       }
       logger.log({ project_id, doc_id }, 'flushed doc via http')
@@ -192,9 +170,6 @@ module.exports = HttpController = {
   }, // No Content
 
   deleteDoc(req, res, next) {
-    if (next == null) {
-      next = function (error) {}
-    }
     const { doc_id } = req.params
     const { project_id } = req.params
     const ignoreFlushErrors = req.query.ignore_flush_errors === 'true'
@@ -210,7 +185,7 @@ module.exports = HttpController = {
         // failed and sometimes it is required
         HistoryManager.flushProjectChangesAsync(project_id)
 
-        if (error != null) {
+        if (error) {
           return next(error)
         }
         logger.log({ project_id, doc_id }, 'deleted doc via http')
@@ -220,15 +195,12 @@ module.exports = HttpController = {
   }, // No Content
 
   flushProject(req, res, next) {
-    if (next == null) {
-      next = function (error) {}
-    }
     const { project_id } = req.params
     logger.log({ project_id }, 'flushing project via http')
     const timer = new Metrics.Timer('http.flushProject')
     ProjectManager.flushProjectWithLocks(project_id, function (error) {
       timer.done()
-      if (error != null) {
+      if (error) {
         return next(error)
       }
       logger.log({ project_id }, 'flushed project via http')
@@ -237,21 +209,18 @@ module.exports = HttpController = {
   }, // No Content
 
   deleteProject(req, res, next) {
-    if (next == null) {
-      next = function (error) {}
-    }
     const { project_id } = req.params
     logger.log({ project_id }, 'deleting project via http')
     const options = {}
-    if (req.query != null ? req.query.background : undefined) {
+    if (req.query.background) {
       options.background = true
     } // allow non-urgent flushes to be queued
-    if (req.query != null ? req.query.shutdown : undefined) {
+    if (req.query.shutdown) {
       options.skip_history_flush = true
     } // don't flush history when realtime shuts down
-    if (req.query != null ? req.query.background : undefined) {
+    if (req.query.background) {
       ProjectManager.queueFlushAndDeleteProject(project_id, function (error) {
-        if (error != null) {
+        if (error) {
           return next(error)
         }
         logger.log({ project_id }, 'queue delete of project via http')
@@ -264,7 +233,7 @@ module.exports = HttpController = {
         options,
         function (error) {
           timer.done()
-          if (error != null) {
+          if (error) {
             return next(error)
           }
           logger.log({ project_id }, 'deleted project via http')
@@ -275,11 +244,7 @@ module.exports = HttpController = {
   }, // No Content
 
   deleteMultipleProjects(req, res, next) {
-    if (next == null) {
-      next = function (error) {}
-    }
-    const project_ids =
-      (req.body != null ? req.body.project_ids : undefined) || []
+    const project_ids = req.body.project_ids || []
     logger.log({ project_ids }, 'deleting multiple projects via http')
     async.eachSeries(
       project_ids,
@@ -288,7 +253,7 @@ module.exports = HttpController = {
         ProjectManager.queueFlushAndDeleteProject(project_id, cb)
       },
       function (error) {
-        if (error != null) {
+        if (error) {
           return next(error)
         }
         res.sendStatus(204)
@@ -297,11 +262,8 @@ module.exports = HttpController = {
   }, // No Content
 
   acceptChanges(req, res, next) {
-    if (next == null) {
-      next = function (error) {}
-    }
     const { project_id, doc_id } = req.params
-    let change_ids = req.body != null ? req.body.change_ids : undefined
+    let change_ids = req.body.change_ids
     if (change_ids == null) {
       change_ids = [req.params.change_id]
     }
@@ -316,7 +278,7 @@ module.exports = HttpController = {
       change_ids,
       function (error) {
         timer.done()
-        if (error != null) {
+        if (error) {
           return next(error)
         }
         logger.log(
@@ -329,9 +291,6 @@ module.exports = HttpController = {
   }, // No Content
 
   deleteComment(req, res, next) {
-    if (next == null) {
-      next = function (error) {}
-    }
     const { project_id, doc_id, comment_id } = req.params
     logger.log({ project_id, doc_id, comment_id }, 'deleting comment via http')
     const timer = new Metrics.Timer('http.deleteComment')
@@ -341,7 +300,7 @@ module.exports = HttpController = {
       comment_id,
       function (error) {
         timer.done()
-        if (error != null) {
+        if (error) {
           return next(error)
         }
         logger.log(
@@ -354,9 +313,6 @@ module.exports = HttpController = {
   }, // No Content
 
   updateProject(req, res, next) {
-    if (next == null) {
-      next = function (error) {}
-    }
     const timer = new Metrics.Timer('http.updateProject')
     const { project_id } = req.params
     const {
@@ -380,7 +336,7 @@ module.exports = HttpController = {
       version,
       function (error) {
         timer.done()
-        if (error != null) {
+        if (error) {
           return next(error)
         }
         logger.log({ project_id }, 'updated project via http')
@@ -390,9 +346,6 @@ module.exports = HttpController = {
   }, // No Content
 
   resyncProjectHistory(req, res, next) {
-    if (next == null) {
-      next = function (error) {}
-    }
     const { project_id } = req.params
     const { projectHistoryId, docs, files } = req.body
 
@@ -406,7 +359,7 @@ module.exports = HttpController = {
       docs,
       files,
       function (error) {
-        if (error != null) {
+        if (error) {
           return next(error)
         }
         logger.log({ project_id }, 'queued project history resync via http')
@@ -416,9 +369,6 @@ module.exports = HttpController = {
   },
 
   flushAllProjects(req, res, next) {
-    if (next == null) {
-      next = function (error) {}
-    }
     res.setTimeout(5 * 60 * 1000)
     const options = {
       limit: req.query.limit || 1000,
@@ -426,7 +376,7 @@ module.exports = HttpController = {
       dryRun: req.query.dryRun || false
     }
     ProjectFlusher.flushAllProjects(options, function (err, project_ids) {
-      if (err != null) {
+      if (err) {
         logger.err({ err }, 'error bulk flushing projects')
         res.sendStatus(500)
       } else {
@@ -436,9 +386,6 @@ module.exports = HttpController = {
   },
 
   flushQueuedProjects(req, res, next) {
-    if (next == null) {
-      next = function (error) {}
-    }
     res.setTimeout(10 * 60 * 1000)
     const options = {
       limit: req.query.limit || 1000,
@@ -449,7 +396,7 @@ module.exports = HttpController = {
       err,
       flushed
     ) {
-      if (err != null) {
+      if (err) {
         logger.err({ err }, 'error flushing old projects')
         res.sendStatus(500)
       } else {