diff --git a/services/web/app/src/Features/User/UserEmailsConfirmationHandler.js b/services/web/app/src/Features/User/UserEmailsConfirmationHandler.js
index a466df67ea..523bdaf9a4 100644
--- a/services/web/app/src/Features/User/UserEmailsConfirmationHandler.js
+++ b/services/web/app/src/Features/User/UserEmailsConfirmationHandler.js
@@ -1,18 +1,3 @@
-/* eslint-disable
-    camelcase,
-    handle-callback-err,
-    max-len,
-    no-unused-vars,
-*/
-// TODO: This file was created by bulk-decaffeinate.
-// Fix any style issues and re-enable lint.
-/*
- * decaffeinate suggestions:
- * DS102: Remove unnecessary code created because of implicit returns
- * DS207: Consider shorter variations of null checks
- * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
- */
-let UserEmailsConfirmationHandler
 const EmailHelper = require('../Helpers/EmailHelper')
 const EmailHandler = require('../Email/EmailHandler')
 const OneTimeTokenHandler = require('../Security/OneTimeTokenHandler')
@@ -24,11 +9,8 @@ const UserGetter = require('./UserGetter')
 
 const ONE_YEAR_IN_S = 365 * 24 * 60 * 60
 
-module.exports = UserEmailsConfirmationHandler = {
-  sendConfirmationEmail(user_id, email, emailTemplate, callback) {
-    if (callback == null) {
-      callback = function(error) {}
-    }
+const UserEmailsConfirmationHandler = {
+  sendConfirmationEmail(userId, email, emailTemplate, callback) {
     if (arguments.length === 3) {
       callback = emailTemplate
       emailTemplate = 'confirmEmail'
@@ -41,16 +23,16 @@ module.exports = UserEmailsConfirmationHandler = {
     }
 
     email = EmailHelper.parseEmail(email)
-    if (email == null) {
+    if (!email) {
       return callback(new Error('invalid email'))
     }
-    const data = { user_id, email }
-    return OneTimeTokenHandler.getNewToken(
+    const data = { user_id: userId, email }
+    OneTimeTokenHandler.getNewToken(
       'email_confirmation',
       data,
       { expiresIn: ONE_YEAR_IN_S },
       function(err, token) {
-        if (err != null) {
+        if (err) {
           return callback(err)
         }
         const emailOptions = {
@@ -58,49 +40,49 @@ module.exports = UserEmailsConfirmationHandler = {
           confirmEmailUrl: `${
             settings.siteUrl
           }/user/emails/confirm?token=${token}`,
-          sendingUser_id: user_id
+          sendingUser_id: userId
         }
-        return EmailHandler.sendEmail(emailTemplate, emailOptions, callback)
+        EmailHandler.sendEmail(emailTemplate, emailOptions, callback)
       }
     )
   },
 
   confirmEmailFromToken(token, callback) {
-    if (callback == null) {
-      callback = function(error) {}
-    }
     logger.log(
       { token_start: token.slice(0, 8) },
       'confirming email from token'
     )
-    return OneTimeTokenHandler.getValueFromTokenAndExpire(
+    OneTimeTokenHandler.getValueFromTokenAndExpire(
       'email_confirmation',
       token,
       function(error, data) {
-        if (error != null) {
+        if (error) {
           return callback(error)
         }
-        if (data == null) {
+        if (!data) {
           return callback(new Errors.NotFoundError('no token found'))
         }
-        const { user_id, email } = data
+        const userId = data.user_id
+        const email = data.email
         logger.log(
-          { data, user_id, email, token_start: token.slice(0, 8) },
+          { data, userId, email, token_start: token.slice(0, 8) },
           'found data for email confirmation'
         )
-        if (user_id == null || email !== EmailHelper.parseEmail(email)) {
+        if (!userId || email !== EmailHelper.parseEmail(email)) {
           return callback(new Errors.NotFoundError('invalid data'))
         }
-        return UserGetter.getUser(user_id, {}, function(error, user) {
-          if (error != null) {
+        UserGetter.getUser(userId, {}, function(error, user) {
+          if (error) {
             return callback(error)
           }
-          if (!(user != null ? user._id : undefined)) {
+          if (!user) {
             return callback(new Errors.NotFoundError('user not found'))
           }
-          return UserUpdater.confirmEmail(user_id, email, callback)
+          UserUpdater.confirmEmail(userId, email, callback)
         })
       }
     )
   }
 }
+
+module.exports = UserEmailsConfirmationHandler
diff --git a/services/web/app/src/Features/User/UserEmailsController.js b/services/web/app/src/Features/User/UserEmailsController.js
index 9edd3872d5..9fbc1330fa 100644
--- a/services/web/app/src/Features/User/UserEmailsController.js
+++ b/services/web/app/src/Features/User/UserEmailsController.js
@@ -1,16 +1,3 @@
-/* eslint-disable
-    handle-callback-err,
-    max-len,
-*/
-// TODO: This file was created by bulk-decaffeinate.
-// Fix any style issues and re-enable lint.
-/*
- * decaffeinate suggestions:
- * DS102: Remove unnecessary code created because of implicit returns
- * DS103: Rewrite code to no longer use __guard__
- * DS207: Consider shorter variations of null checks
- * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
- */
 let UserEmailsController
 const AuthenticationController = require('../Authentication/AuthenticationController')
 const UserGetter = require('./UserGetter')
@@ -25,18 +12,18 @@ const HttpErrors = require('@overleaf/o-error/http')
 module.exports = UserEmailsController = {
   list(req, res, next) {
     const userId = AuthenticationController.getLoggedInUserId(req)
-    return UserGetter.getUserFullEmails(userId, function(error, fullEmails) {
-      if (error != null) {
+    UserGetter.getUserFullEmails(userId, function(error, fullEmails) {
+      if (error) {
         return next(error)
       }
-      return res.json(fullEmails)
+      res.json(fullEmails)
     })
   },
 
   add(req, res, next) {
     const userId = AuthenticationController.getLoggedInUserId(req)
     const email = EmailHelper.parseEmail(req.body.email)
-    if (email == null) {
+    if (!email) {
       return res.sendStatus(422)
     }
 
@@ -45,47 +32,44 @@ module.exports = UserEmailsController = {
       role: req.body.role,
       department: req.body.department
     }
-    return UserUpdater.addEmailAddress(
-      userId,
-      email,
-      affiliationOptions,
-      function(error) {
-        if (error != null) {
-          return UserEmailsController._handleEmailError(error, req, res, next)
-        }
-        return UserEmailsConfirmationHandler.sendConfirmationEmail(
-          userId,
-          email,
-          function(err) {
-            if (error != null) {
-              return next(error)
-            }
-            return res.sendStatus(204)
-          }
-        )
+    UserUpdater.addEmailAddress(userId, email, affiliationOptions, function(
+      error
+    ) {
+      if (error) {
+        return UserEmailsController._handleEmailError(error, req, res, next)
       }
-    )
+      UserEmailsConfirmationHandler.sendConfirmationEmail(
+        userId,
+        email,
+        function(error) {
+          if (error) {
+            return next(error)
+          }
+          res.sendStatus(204)
+        }
+      )
+    })
   },
 
   remove(req, res, next) {
     const userId = AuthenticationController.getLoggedInUserId(req)
     const email = EmailHelper.parseEmail(req.body.email)
-    if (email == null) {
+    if (!email) {
       return res.sendStatus(422)
     }
 
-    return UserUpdater.removeEmailAddress(userId, email, function(error) {
-      if (error != null) {
+    UserUpdater.removeEmailAddress(userId, email, function(error) {
+      if (error) {
         return next(error)
       }
-      return res.sendStatus(200)
+      res.sendStatus(200)
     })
   },
 
   setDefault(req, res, next) {
     const userId = AuthenticationController.getLoggedInUserId(req)
     const email = EmailHelper.parseEmail(req.body.email)
-    if (email == null) {
+    if (!email) {
       return res.sendStatus(422)
     }
     UserUpdater.setDefaultEmailAddress(userId, email, err => {
@@ -100,20 +84,20 @@ module.exports = UserEmailsController = {
   endorse(req, res, next) {
     const userId = AuthenticationController.getLoggedInUserId(req)
     const email = EmailHelper.parseEmail(req.body.email)
-    if (email == null) {
+    if (!email) {
       return res.sendStatus(422)
     }
 
-    return endorseAffiliation(
+    endorseAffiliation(
       userId,
       email,
       req.body.role,
       req.body.department,
       function(error) {
-        if (error != null) {
+        if (error) {
           return next(error)
         }
-        return res.sendStatus(204)
+        res.sendStatus(204)
       }
     )
   },
@@ -121,43 +105,36 @@ module.exports = UserEmailsController = {
   resendConfirmation(req, res, next) {
     const userId = AuthenticationController.getLoggedInUserId(req)
     const email = EmailHelper.parseEmail(req.body.email)
-    if (email == null) {
+    if (!email) {
       return res.sendStatus(422)
     }
-    return UserGetter.getUserByAnyEmail(email, { _id: 1 }, function(
-      error,
-      user
-    ) {
-      if (error != null) {
+    UserGetter.getUserByAnyEmail(email, { _id: 1 }, function(error, user) {
+      if (error) {
         return next(error)
       }
-      if (
-        user == null ||
-        __guard__(user != null ? user._id : undefined, x => x.toString()) !==
-          userId
-      ) {
+      if (!user || user._id.toString() !== userId) {
         logger.log(
-          { userId, email, foundUserId: user != null ? user._id : undefined },
+          { userId, email, foundUserId: user && user._id },
           "email doesn't match logged in user"
         )
         return res.sendStatus(422)
       }
       logger.log({ userId, email }, 'resending email confirmation token')
-      return UserEmailsConfirmationHandler.sendConfirmationEmail(
+      UserEmailsConfirmationHandler.sendConfirmationEmail(
         userId,
         email,
         function(error) {
-          if (error != null) {
+          if (error) {
             return next(error)
           }
-          return res.sendStatus(200)
+          res.sendStatus(200)
         }
       )
     })
   },
 
   showConfirm(req, res, next) {
-    return res.render('user/confirm_email', {
+    res.render('user/confirm_email', {
       token: req.query.token,
       title: 'confirm_email'
     })
@@ -165,23 +142,21 @@ module.exports = UserEmailsController = {
 
   confirm(req, res, next) {
     const { token } = req.body
-    if (token == null) {
+    if (!token) {
       return res.sendStatus(422)
     }
-    return UserEmailsConfirmationHandler.confirmEmailFromToken(token, function(
-      error
-    ) {
-      if (error != null) {
+    UserEmailsConfirmationHandler.confirmEmailFromToken(token, function(error) {
+      if (error) {
         if (error instanceof Errors.NotFoundError) {
-          return res.status(404).json({
+          res.status(404).json({
             message:
               'Sorry, your confirmation token is invalid or has expired. Please request a new email confirmation link.'
           })
         } else {
-          return next(error)
+          next(error)
         }
       } else {
-        return res.sendStatus(200)
+        res.sendStatus(200)
       }
     })
   },
@@ -207,8 +182,3 @@ module.exports = UserEmailsController = {
     next(new HttpErrors.InternalServerError().withCause(error))
   }
 }
-function __guard__(value, transform) {
-  return typeof value !== 'undefined' && value !== null
-    ? transform(value)
-    : undefined
-}
diff --git a/services/web/app/src/Features/User/UserGetter.js b/services/web/app/src/Features/User/UserGetter.js
index 06da844c3a..1d7b4a10ad 100644
--- a/services/web/app/src/Features/User/UserGetter.js
+++ b/services/web/app/src/Features/User/UserGetter.js
@@ -1,16 +1,3 @@
-/* eslint-disable
-    camelcase,
-    handle-callback-err,
-    max-len,
-*/
-// TODO: This file was created by bulk-decaffeinate.
-// Fix any style issues and re-enable lint.
-/*
- * decaffeinate suggestions:
- * DS102: Remove unnecessary code created because of implicit returns
- * DS207: Consider shorter variations of null checks
- * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
- */
 const mongojs = require('../../infrastructure/mongojs')
 const metrics = require('metrics-sharelatex')
 const logger = require('logger-sharelatex')
@@ -23,10 +10,7 @@ const Features = require('../../infrastructure/Features')
 
 const UserGetter = {
   getUser(query, projection, callback) {
-    if (callback == null) {
-      callback = function(error, user) {}
-    }
-    if (query == null) {
+    if (!query) {
       return callback(new Error('no query provided'))
     }
     if (arguments.length === 2) {
@@ -43,24 +27,18 @@ const UserGetter = {
       query = { _id: query }
     }
 
-    return db.users.findOne(query, projection, callback)
+    db.users.findOne(query, projection, callback)
   },
 
   getUserEmail(userId, callback) {
-    if (callback == null) {
-      callback = function(error, email) {}
-    }
-    return this.getUser(userId, { email: 1 }, (error, user) =>
-      callback(error, user != null ? user.email : undefined)
+    this.getUser(userId, { email: 1 }, (error, user) =>
+      callback(error, user && user.email)
     )
   },
 
   getUserFullEmails(userId, callback) {
-    if (callback == null) {
-      callback = function(error, emails) {}
-    }
-    return this.getUser(userId, { email: 1, emails: 1 }, function(error, user) {
-      if (error != null) {
+    this.getUser(userId, { email: 1, emails: 1 }, function(error, user) {
+      if (error) {
         return callback(error)
       }
       if (!user) {
@@ -71,11 +49,11 @@ const UserGetter = {
         return callback(null, decorateFullEmails(user.email, user.emails, []))
       }
 
-      return getUserAffiliations(userId, function(error, affiliationsData) {
-        if (error != null) {
+      getUserAffiliations(userId, function(error, affiliationsData) {
+        if (error) {
           return callback(error)
         }
-        return callback(
+        callback(
           null,
           decorateFullEmails(user.email, user.emails || [], affiliationsData)
         )
@@ -84,21 +62,15 @@ const UserGetter = {
   },
 
   getUserByMainEmail(email, projection, callback) {
-    if (callback == null) {
-      callback = function(error, user) {}
-    }
     email = email.trim()
     if (arguments.length === 2) {
       callback = projection
       projection = {}
     }
-    return db.users.findOne({ email }, projection, callback)
+    db.users.findOne({ email }, projection, callback)
   },
 
   getUserByAnyEmail(email, projection, callback) {
-    if (callback == null) {
-      callback = function(error, user) {}
-    }
     email = email.trim()
     if (arguments.length === 2) {
       callback = projection
@@ -106,21 +78,18 @@ const UserGetter = {
     }
     // $exists: true MUST be set to use the partial index
     const query = { emails: { $exists: true }, 'emails.email': email }
-    return db.users.findOne(query, projection, (error, user) => {
-      if (error != null || user != null) {
+    db.users.findOne(query, projection, (error, user) => {
+      if (error || user) {
         return callback(error, user)
       }
 
       // While multiple emails are being rolled out, check for the main email as
       // well
-      return this.getUserByMainEmail(email, projection, callback)
+      this.getUserByMainEmail(email, projection, callback)
     })
   },
 
   getUsersByAnyConfirmedEmail(emails, projection, callback) {
-    if (callback == null) {
-      callback = function(error, user) {}
-    }
     if (arguments.length === 2) {
       callback = projection
       projection = {}
@@ -132,29 +101,19 @@ const UserGetter = {
         $elemMatch: { email: { $in: emails }, confirmedAt: { $exists: true } }
       }
     }
-    return db.users.find(query, projection, (error, users) => {
-      return callback(error, users)
-    })
+    db.users.find(query, projection, callback)
   },
 
   getUsersByV1Ids(v1Ids, projection, callback) {
-    if (callback == null) {
-      callback = function(error, user) {}
-    }
     if (arguments.length === 2) {
       callback = projection
       projection = {}
     }
     const query = { 'overleaf.id': { $in: v1Ids } }
-    return db.users.find(query, projection, (error, users) => {
-      return callback(error, users)
-    })
+    db.users.find(query, projection, callback)
   },
 
   getUsersByHostname(hostname, projection, callback) {
-    if (callback == null) {
-      callback = function(error, users) {}
-    }
     const reversedHostname = hostname
       .trim()
       .split('')
@@ -164,59 +123,49 @@ const UserGetter = {
       emails: { $exists: true },
       'emails.reversedHostname': reversedHostname
     }
-    return db.users.find(query, projection, callback)
+    db.users.find(query, projection, callback)
   },
 
-  getUsers(user_ids, projection, callback) {
-    if (callback == null) {
-      callback = function(error, users) {}
-    }
+  getUsers(userIds, projection, callback) {
     try {
-      user_ids = user_ids.map(u => ObjectId(u.toString()))
-    } catch (error1) {
-      const error = error1
+      userIds = userIds.map(u => ObjectId(u.toString()))
+    } catch (error) {
       return callback(error)
     }
 
-    return db.users.find({ _id: { $in: user_ids } }, projection, callback)
+    db.users.find({ _id: { $in: userIds } }, projection, callback)
   },
 
-  getUserOrUserStubById(user_id, projection, callback) {
+  getUserOrUserStubById(userId, projection, callback) {
     let query
-    if (callback == null) {
-      callback = function(error, user, isStub) {}
-    }
     try {
-      query = { _id: ObjectId(user_id.toString()) }
+      query = { _id: ObjectId(userId.toString()) }
     } catch (e) {
       return callback(new Error(e))
     }
-    return db.users.findOne(query, projection, function(error, user) {
-      if (error != null) {
+    db.users.findOne(query, projection, function(error, user) {
+      if (error) {
         return callback(error)
       }
-      if (user != null) {
+      if (user) {
         return callback(null, user, false)
       }
-      return db.userstubs.findOne(query, projection, function(error, user) {
-        if (error) {
-          return callback(error)
+      db.userstubs.findOne(query, projection, function(error, user) {
+        if (error || user) {
+          return callback(error, user)
         }
-        if (user == null) {
-          return callback()
-        }
-        return callback(null, user, true)
+        callback(null, user, true)
       })
     })
   },
 
   // check for duplicate email address. This is also enforced at the DB level
   ensureUniqueEmailAddress(newEmail, callback) {
-    return this.getUserByAnyEmail(newEmail, function(error, user) {
-      if (user != null) {
+    this.getUserByAnyEmail(newEmail, function(error, user) {
+      if (user) {
         return callback(new Errors.EmailExistsError())
       }
-      return callback(error)
+      callback(error)
     })
   }
 }
@@ -228,7 +177,7 @@ var decorateFullEmails = (defaultEmail, emailsData, affiliationsData) =>
     const affiliation = affiliationsData.find(
       aff => aff.email === emailData.email
     )
-    if (affiliation != null) {
+    if (affiliation) {
       const { institution, inferred, role, department } = affiliation
       emailData.affiliation = { institution, inferred, role, department }
     } else {
diff --git a/services/web/app/src/Features/User/UserHandler.js b/services/web/app/src/Features/User/UserHandler.js
index e0419c9da0..e68ae50c1f 100644
--- a/services/web/app/src/Features/User/UserHandler.js
+++ b/services/web/app/src/Features/User/UserHandler.js
@@ -1,30 +1,15 @@
-/* eslint-disable
-    max-len,
-    no-unused-vars,
-*/
-// TODO: This file was created by bulk-decaffeinate.
-// Fix any style issues and re-enable lint.
-/*
- * decaffeinate suggestions:
- * DS102: Remove unnecessary code created because of implicit returns
- * DS207: Consider shorter variations of null checks
- * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
- */
-let UserHandler
 const TeamInvitesHandler = require('../Subscription/TeamInvitesHandler')
 
-module.exports = UserHandler = {
+const UserHandler = {
   populateTeamInvites(user, callback) {
-    return TeamInvitesHandler.createTeamInvitesForLegacyInvitedEmail(
+    TeamInvitesHandler.createTeamInvitesForLegacyInvitedEmail(
       user.email,
       callback
     )
   },
 
   setupLoginData(user, callback) {
-    if (callback == null) {
-      callback = function() {}
-    }
-    return this.populateTeamInvites(user, callback)
+    this.populateTeamInvites(user, callback)
   }
 }
+module.exports = UserHandler
diff --git a/services/web/app/src/Features/User/UserInfoController.js b/services/web/app/src/Features/User/UserInfoController.js
index 1ee22bfc06..7fa707cf2a 100644
--- a/services/web/app/src/Features/User/UserInfoController.js
+++ b/services/web/app/src/Features/User/UserInfoController.js
@@ -1,41 +1,21 @@
-/* eslint-disable
-    camelcase,
-    handle-callback-err,
-    max-len,
-    no-unused-vars,
-*/
-// TODO: This file was created by bulk-decaffeinate.
-// Fix any style issues and re-enable lint.
-/*
- * decaffeinate suggestions:
- * DS102: Remove unnecessary code created because of implicit returns
- * DS207: Consider shorter variations of null checks
- * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
- */
 let UserController
 const UserGetter = require('./UserGetter')
 const logger = require('logger-sharelatex')
-const UserDeleter = require('./UserDeleter')
-const UserUpdater = require('./UserUpdater')
-const sanitize = require('sanitizer')
 const AuthenticationController = require('../Authentication/AuthenticationController')
 const { ObjectId } = require('mongojs')
 
 module.exports = UserController = {
   getLoggedInUsersPersonalInfo(req, res, next) {
-    if (next == null) {
-      next = function(error) {}
-    }
-    const user_id = AuthenticationController.getLoggedInUserId(req)
+    const userId = AuthenticationController.getLoggedInUserId(req)
     logger.log(
-      { user_id },
+      { userId },
       'reciving request for getting logged in users personal info'
     )
-    if (user_id == null) {
+    if (!userId) {
       return next(new Error('User is not logged in'))
     }
-    return UserGetter.getUser(
-      user_id,
+    UserGetter.getUser(
+      userId,
       {
         first_name: true,
         last_name: true,
@@ -45,64 +25,55 @@ module.exports = UserController = {
         signUpDate: true
       },
       function(error, user) {
-        if (error != null) {
+        if (error) {
           return next(error)
         }
-        return UserController.sendFormattedPersonalInfo(user, res, next)
+        UserController.sendFormattedPersonalInfo(user, res, next)
       }
     )
   },
 
   getPersonalInfo(req, res, next) {
     let query
-    if (next == null) {
-      next = function(error) {}
-    }
-    const { user_id } = req.params
+    const userId = req.params.user_id
 
-    if (/^\d+$/.test(user_id)) {
-      query = { 'overleaf.id': parseInt(user_id, 10) }
-    } else if (/^[a-f0-9]{24}$/.test(user_id)) {
-      query = { _id: ObjectId(user_id) }
+    if (/^\d+$/.test(userId)) {
+      query = { 'overleaf.id': parseInt(userId, 10) }
+    } else if (/^[a-f0-9]{24}$/.test(userId)) {
+      query = { _id: ObjectId(userId) }
     } else {
       return res.send(400)
     }
 
-    return UserGetter.getUser(
+    UserGetter.getUser(
       query,
       { _id: true, first_name: true, last_name: true, email: true },
       function(error, user) {
         logger.log(
-          { user_id: req.params.user_id },
+          { userId },
           'receiving request for getting users personal info'
         )
-        if (error != null) {
+        if (error) {
           return next(error)
         }
-        if (user == null) {
+        if (!user) {
           return res.send(404)
         }
-        return UserController.sendFormattedPersonalInfo(user, res, next)
+        UserController.sendFormattedPersonalInfo(user, res, next)
       }
     )
   },
 
   sendFormattedPersonalInfo(user, res, next) {
-    if (next == null) {
-      next = function(error) {}
-    }
     const info = UserController.formatPersonalInfo(user)
-    return res.json(info)
+    res.json(info)
   },
 
   formatPersonalInfo(user, callback) {
-    if (callback == null) {
-      callback = function(error, info) {}
-    }
-    if (user == null) {
+    if (!user) {
       return {}
     }
-    const formatted_user = { id: user._id.toString() }
+    const formattedUser = { id: user._id.toString() }
     for (let key of [
       'first_name',
       'last_name',
@@ -111,10 +82,10 @@ module.exports = UserController = {
       'role',
       'institution'
     ]) {
-      if (user[key] != null) {
-        formatted_user[key] = user[key]
+      if (user[key]) {
+        formattedUser[key] = user[key]
       }
     }
-    return formatted_user
+    return formattedUser
   }
 }
diff --git a/services/web/app/src/Features/User/UserInfoManager.js b/services/web/app/src/Features/User/UserInfoManager.js
index f5b733d973..cac5c57420 100644
--- a/services/web/app/src/Features/User/UserInfoManager.js
+++ b/services/web/app/src/Features/User/UserInfoManager.js
@@ -1,29 +1,13 @@
-/* eslint-disable
-    camelcase,
-    handle-callback-err,
-    max-len,
-    no-unused-vars,
-*/
-// TODO: This file was created by bulk-decaffeinate.
-// Fix any style issues and re-enable lint.
-/*
- * decaffeinate suggestions:
- * DS102: Remove unnecessary code created because of implicit returns
- * DS207: Consider shorter variations of null checks
- * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
- */
-let UserInfoManager
 const UserGetter = require('./UserGetter')
 
-module.exports = UserInfoManager = {
-  getPersonalInfo(user_id, callback) {
-    if (callback == null) {
-      callback = function(error) {}
-    }
-    return UserGetter.getUser(
-      user_id,
+const UserInfoManager = {
+  getPersonalInfo(userId, callback) {
+    UserGetter.getUser(
+      userId,
       { _id: true, first_name: true, last_name: true, email: true },
       callback
     )
   }
 }
+
+module.exports = UserInfoManager
diff --git a/services/web/app/src/Features/User/UserSessionsManager.js b/services/web/app/src/Features/User/UserSessionsManager.js
index 0604f906ca..9c030c7861 100644
--- a/services/web/app/src/Features/User/UserSessionsManager.js
+++ b/services/web/app/src/Features/User/UserSessionsManager.js
@@ -1,18 +1,3 @@
-/* eslint-disable
-    camelcase,
-    handle-callback-err,
-    max-len,
-*/
-// TODO: This file was created by bulk-decaffeinate.
-// Fix any style issues and re-enable lint.
-/*
- * decaffeinate suggestions:
- * DS101: Remove unnecessary use of Array.from
- * DS102: Remove unnecessary code created because of implicit returns
- * DS103: Rewrite code to no longer use __guard__
- * DS207: Consider shorter variations of null checks
- * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
- */
 let UserSessionsManager
 const Settings = require('settings-sharelatex')
 const logger = require('logger-sharelatex')
@@ -28,26 +13,23 @@ module.exports = UserSessionsManager = {
   },
 
   trackSession(user, sessionId, callback) {
-    if (callback == null) {
-      callback = function(err) {}
-    }
-    if (user == null) {
+    if (!user) {
       logger.log({ sessionId }, 'no user to track, returning')
       return callback(null)
     }
-    if (sessionId == null) {
+    if (!sessionId) {
       logger.log({ user_id: user._id }, 'no sessionId to track, returning')
       return callback(null)
     }
     logger.log({ user_id: user._id, sessionId }, 'onLogin handler')
     const sessionSetKey = UserSessionsRedis.sessionSetKey(user)
     const value = UserSessionsManager._sessionKey(sessionId)
-    return rclient
+    rclient
       .multi()
       .sadd(sessionSetKey, value)
       .pexpire(sessionSetKey, `${Settings.cookieSessionLength}`) // in milliseconds
       .exec(function(err, response) {
-        if (err != null) {
+        if (err) {
           logger.warn(
             { err, user_id: user._id, sessionSetKey },
             'error while adding session key to UserSessions set'
@@ -55,31 +37,31 @@ module.exports = UserSessionsManager = {
           return callback(err)
         }
         UserSessionsManager._checkSessions(user, function() {})
-        return callback()
+        callback()
       })
   },
 
   untrackSession(user, sessionId, callback) {
-    if (callback == null) {
-      callback = function(err) {}
+    if (!callback) {
+      callback = function() {}
     }
-    if (user == null) {
+    if (!user) {
       logger.log({ sessionId }, 'no user to untrack, returning')
       return callback(null)
     }
-    if (sessionId == null) {
+    if (!sessionId) {
       logger.log({ user_id: user._id }, 'no sessionId to untrack, returning')
       return callback(null)
     }
     logger.log({ user_id: user._id, sessionId }, 'onLogout handler')
     const sessionSetKey = UserSessionsRedis.sessionSetKey(user)
     const value = UserSessionsManager._sessionKey(sessionId)
-    return rclient
+    rclient
       .multi()
       .srem(sessionSetKey, value)
       .pexpire(sessionSetKey, `${Settings.cookieSessionLength}`) // in milliseconds
       .exec(function(err, response) {
-        if (err != null) {
+        if (err) {
           logger.warn(
             { err, user_id: user._id, sessionSetKey },
             'error while removing session key from UserSessions set'
@@ -87,18 +69,15 @@ module.exports = UserSessionsManager = {
           return callback(err)
         }
         UserSessionsManager._checkSessions(user, function() {})
-        return callback()
+        callback()
       })
   },
 
   getAllUserSessions(user, exclude, callback) {
-    if (callback == null) {
-      callback = function(err, sessionKeys) {}
-    }
     exclude = _.map(exclude, UserSessionsManager._sessionKey)
     const sessionSetKey = UserSessionsRedis.sessionSetKey(user)
-    return rclient.smembers(sessionSetKey, function(err, sessionKeys) {
-      if (err != null) {
+    rclient.smembers(sessionSetKey, function(err, sessionKeys) {
+      if (err) {
         logger.warn(
           { user_id: user._id },
           'error getting all session keys for user from redis'
@@ -111,58 +90,53 @@ module.exports = UserSessionsManager = {
         return callback(null, [])
       }
 
-      return Async.mapSeries(
-        sessionKeys,
-        (k, cb) => rclient.get(k, cb),
-        function(err, sessions) {
-          if (err != null) {
-            logger.warn(
-              { user_id: user._id },
-              'error getting all sessions for user from redis'
-            )
-            return callback(err)
-          }
-
-          const result = []
-          for (let session of Array.from(sessions)) {
-            if (session === null) {
-              continue
-            }
-            session = JSON.parse(session)
-            const session_user =
-              (session != null ? session.user : undefined) ||
-              __guard__(
-                session != null ? session.passport : undefined,
-                x => x.user
-              )
-            result.push({
-              ip_address: session_user.ip_address,
-              session_created: session_user.session_created
-            })
-          }
-
-          return callback(null, result)
+      Async.mapSeries(sessionKeys, (k, cb) => rclient.get(k, cb), function(
+        err,
+        sessions
+      ) {
+        if (err) {
+          logger.warn(
+            { user_id: user._id },
+            'error getting all sessions for user from redis'
+          )
+          return callback(err)
         }
-      )
+
+        const result = []
+        for (let session of Array.from(sessions)) {
+          if (!session) {
+            continue
+          }
+          session = JSON.parse(session)
+          let sessionUser = session.passport && session.passport.user
+          if (!sessionUser) {
+            sessionUser = session.user
+          }
+
+          result.push({
+            ip_address: sessionUser.ip_address,
+            session_created: sessionUser.session_created
+          })
+        }
+
+        callback(null, result)
+      })
     })
   },
 
   revokeAllUserSessions(user, retain, callback) {
-    if (callback == null) {
-      callback = function(err) {}
-    }
-    if (retain == null) {
+    if (!retain) {
       retain = []
     }
     retain = retain.map(i => UserSessionsManager._sessionKey(i))
-    if (user == null) {
+    if (!user) {
       logger.log({}, 'no user to revoke sessions for, returning')
       return callback(null)
     }
     logger.log({ user_id: user._id }, 'revoking all existing sessions for user')
     const sessionSetKey = UserSessionsRedis.sessionSetKey(user)
-    return rclient.smembers(sessionSetKey, function(err, sessionKeys) {
-      if (err != null) {
+    rclient.smembers(sessionSetKey, function(err, sessionKeys) {
+      if (err) {
         logger.warn(
           { err, user_id: user._id, sessionSetKey },
           'error getting contents of UserSessions set'
@@ -187,65 +161,59 @@ module.exports = UserSessionsManager = {
 
       const deletions = keysToDelete.map(k => cb => rclient.del(k, cb))
 
-      return Async.series(deletions, function(err, _result) {
-        if (err != null) {
+      Async.series(deletions, function(err, _result) {
+        if (err) {
           logger.warn(
             { err, user_id: user._id, sessionSetKey },
             'errror revoking all sessions for user'
           )
           return callback(err)
         }
-        return rclient.srem(sessionSetKey, keysToDelete, function(err) {
-          if (err != null) {
+        rclient.srem(sessionSetKey, keysToDelete, function(err) {
+          if (err) {
             logger.warn(
               { err, user_id: user._id, sessionSetKey },
               'error removing session set for user'
             )
             return callback(err)
           }
-          return callback(null)
+          callback(null)
         })
       })
     })
   },
 
   touch(user, callback) {
-    if (callback == null) {
-      callback = function(err) {}
-    }
-    if (user == null) {
+    if (!user) {
       logger.log({}, 'no user to touch sessions for, returning')
       return callback(null)
     }
     const sessionSetKey = UserSessionsRedis.sessionSetKey(user)
-    return rclient.pexpire(
+    rclient.pexpire(
       sessionSetKey,
       `${Settings.cookieSessionLength}`, // in milliseconds
       function(err, response) {
-        if (err != null) {
+        if (err) {
           logger.warn(
             { err, user_id: user._id },
             'error while updating ttl on UserSessions set'
           )
           return callback(err)
         }
-        return callback(null)
+        callback(null)
       }
     )
   },
 
   _checkSessions(user, callback) {
-    if (callback == null) {
-      callback = function(err) {}
-    }
-    if (user == null) {
+    if (!user) {
       logger.log({}, 'no user, returning')
       return callback(null)
     }
     logger.log({ user_id: user._id }, 'checking sessions for user')
     const sessionSetKey = UserSessionsRedis.sessionSetKey(user)
-    return rclient.smembers(sessionSetKey, function(err, sessionKeys) {
-      if (err != null) {
+    rclient.smembers(sessionSetKey, function(err, sessionKeys) {
+      if (err) {
         logger.warn(
           { err, user_id: user._id, sessionSetKey },
           'error getting contents of UserSessions set'
@@ -256,39 +224,30 @@ module.exports = UserSessionsManager = {
         { user_id: user._id, count: sessionKeys.length },
         'checking sessions for user'
       )
-      return Async.series(
+      Async.series(
         sessionKeys.map(key => next =>
           rclient.get(key, function(err, val) {
-            if (err != null) {
+            if (err) {
               return next(err)
             }
-            if (val == null) {
+            if (!val) {
               logger.log(
                 { user_id: user._id, key },
                 '>> removing key from UserSessions set'
               )
-              return rclient.srem(sessionSetKey, key, function(err, result) {
-                if (err != null) {
-                  return next(err)
-                }
-                return next(null)
+              rclient.srem(sessionSetKey, key, function(err, result) {
+                return next(err)
               })
             } else {
-              return next()
+              next()
             }
           })
         ),
         function(err, results) {
           logger.log({ user_id: user._id }, 'done checking sessions for user')
-          return callback(err)
+          callback(err)
         }
       )
     })
   }
 }
-
-function __guard__(value, transform) {
-  return typeof value !== 'undefined' && value !== null
-    ? transform(value)
-    : undefined
-}
diff --git a/services/web/app/src/Features/User/UserSessionsRedis.js b/services/web/app/src/Features/User/UserSessionsRedis.js
index 19e324da1a..d2ed7a7530 100644
--- a/services/web/app/src/Features/User/UserSessionsRedis.js
+++ b/services/web/app/src/Features/User/UserSessionsRedis.js
@@ -1,13 +1,7 @@
-/* eslint-disable
-    no-unused-vars,
-*/
-// TODO: This file was created by bulk-decaffeinate.
-// Fix any style issues and re-enable lint.
-let Redis
 const RedisWrapper = require('../../infrastructure/RedisWrapper')
 const rclient = RedisWrapper.client('websessions')
 
-module.exports = Redis = {
+const UserSessionsRedis = {
   client() {
     return rclient
   },
@@ -16,3 +10,4 @@ module.exports = Redis = {
     return `UserSessions:{${user._id}}`
   }
 }
+module.exports = UserSessionsRedis