perf(require): Don't assume require is free, cache deferred imports

src/flux/models/account.coffee

@@ -1,6 +1,8 @@
 ModelWithMetadata = require './model-with-metadata'
 Attributes = require '../attributes'
 _ = require 'underscore'
+CategoryStore = null
+Contact = null
 
 ###
 Public: The Account model represents a Account served by the Nylas Platform API.
@@ -80,14 +82,14 @@ class Account extends ModelWithMetadata
 
   # Returns a {Contact} model that represents the current user.
   me: ->
-    Contact = require './contact'
+    Contact ?= require './contact'
     return new Contact
       accountId: @id
       name: @name
       email: @emailAddress
 
   meUsingAlias: (alias) ->
-    Contact = require './contact'
+    Contact ?= require './contact'
     return @me() unless alias
     return Contact.fromString(alias, accountId: @id)
 
@@ -133,15 +135,15 @@ class Account extends ModelWithMetadata
       return @provider
 
   canArchiveThreads: ->
-    CategoryStore = require '../stores/category-store'
+    CategoryStore ?= require '../stores/category-store'
     CategoryStore.getArchiveCategory(@)?
 
   canTrashThreads: ->
-    CategoryStore = require '../stores/category-store'
+    CategoryStore ?= require '../stores/category-store'
     CategoryStore.getTrashCategory(@)?
 
   defaultFinishedCategory: ->
-    CategoryStore = require '../stores/category-store'
+    CategoryStore ?= require '../stores/category-store'
     preferDelete = NylasEnv.config.get('core.reading.backspaceDelete')
     archiveCategory = CategoryStore.getArchiveCategory(@)
     trashCategory = CategoryStore.getTrashCategory(@)

src/flux/models/file.coffee

@@ -3,6 +3,7 @@ Model = require './model'
 Actions = require '../actions'
 Attributes = require '../attributes'
 _ = require 'underscore'
+RegExpUtils = null
 
 ###
 Public: File model represents a File object served by the Nylas Platform API.
@@ -68,7 +69,7 @@ class File extends Model
       return "Unnamed Attachment"
 
   safeDisplayName: ->
-    RegExpUtils = require '../../regexp-utils'
+    RegExpUtils ?= require '../../regexp-utils'
     return @displayName().replace(RegExpUtils.illegalPathCharactersRegexp(), '-')
 
   # Public: Returns the file extension that should be used for this file.

src/flux/models/query-subscription-pool.coffee

@@ -1,5 +1,6 @@
 _ = require 'underscore'
 QuerySubscription = require './query-subscription'
+DatabaseStore = null
 
 ###
 Public: The QuerySubscriptionPool maintains a list of all of the query
@@ -75,7 +76,7 @@ class QuerySubscriptionPool
     return query.sql()
 
   _setup: =>
-    DatabaseStore = require '../stores/database-store'
+    DatabaseStore ?= require '../stores/database-store'
     DatabaseStore.listen @_onChange
 
   _onChange: (record) =>

src/flux/nylas-api.coffee

@@ -305,7 +305,6 @@ class NylasAPI
 
     # Step 3: Retrieve any existing models from the database for the given IDs.
     ids = _.pluck(unlockedJSONs, 'id')
-    DatabaseStore = require './stores/database-store'
     DatabaseStore.findAll(klass).where(klass.attributes.id.in(ids)).then (models) ->
       existingModels = {}
       existingModels[model.id] = model for model in models

src/flux/stores/database-store.coffee

@@ -13,6 +13,7 @@ PriorityUICoordinator = require '../../priority-ui-coordinator'
 DatabaseSetupQueryBuilder = require './database-setup-query-builder'
 DatabaseChangeRecord = require './database-change-record'
 DatabaseTransaction = require './database-transaction'
+JSONBlob = null
 
 {ipcRenderer} = require 'electron'
 
@@ -436,7 +437,7 @@ class DatabaseStore extends NylasStore
       Promise.resolve(result)
 
   findJSONBlob: (id) ->
-    JSONBlob = require '../models/json-blob'
+    JSONBlob ?= require '../models/json-blob'
     new JSONBlobQuery(JSONBlob, @).where({id}).one()
 
   # Private: Mutation hooks allow you to observe changes to the database and

src/flux/stores/draft-factory.coffee

@@ -6,6 +6,7 @@ AccountStore = require './account-store'
 ContactStore = require './contact-store'
 MessageStore = require './message-store'
 FocusedPerspectiveStore = require './focused-perspective-store'
+DraftStore = null
 
 InlineStyleTransformer = require '../../services/inline-style-transformer'
 SanitizeTransformer = require '../../services/sanitize-transformer'
@@ -166,7 +167,7 @@ class DraftFactory
         return Promise.resolve(candidateDrafts.pop())
 
       else if behavior is 'prefer-existing-if-pristine'
-        DraftStore = require './draft-store'
+        DraftStore ?= require './draft-store'
         return Promise.all(candidateDrafts.map (candidateDraft) =>
           DraftStore.sessionForClientId(candidateDraft.clientId)
         ).then (sessions) =>

src/flux/stores/draft-store-proxy.coffee

@@ -5,6 +5,7 @@ ExtensionRegistry = require '../../extension-registry'
 {Listener, Publisher} = require '../modules/reflux-coffee'
 SyncbackDraftTask = require '../tasks/syncback-draft-task'
 CoffeeHelpers = require '../coffee-helpers'
+DraftStore = null
 
 _ = require 'underscore'
 
@@ -93,7 +94,7 @@ class DraftStoreProxy
   @include Listener
 
   constructor: (@draftClientId, draft = null) ->
-    DraftStore = require './draft-store'
+    DraftStore ?= require './draft-store'
     @listenTo DraftStore, @_onDraftChanged
 
     @_draft = false
@@ -144,8 +145,6 @@ class DraftStoreProxy
 
     # Reverse draft transformations performed by third-party plugins when the draft
     # was last saved to disk
-    DraftStore = require './draft-store'
-
     return Promise.each ExtensionRegistry.Composer.extensions(), (ext) ->
       if ext.applyTransformsToDraft and ext.unapplyTransformsToDraft
         Promise.resolve(ext.unapplyTransformsToDraft({draft})).then (untransformed) ->

src/services/inline-style-transformer.coffee

@@ -2,6 +2,7 @@
 RegExpUtils = require '../regexp-utils'
 crypto = require 'crypto'
 _ = require 'underscore'
+userAgentDefault = null
 
 class InlineStyleTransformer
   constructor: ->
@@ -34,7 +35,7 @@ class InlineStyleTransformer
     i = body.search(RegExpUtils.looseStyleTag())
     return body if i is -1
 
-    userAgentDefault = require '../chrome-user-agent-stylesheet-string'
+    userAgentDefault ?= require '../chrome-user-agent-stylesheet-string'
     return "#{body[0...i]}<style>#{userAgentDefault}</style>#{body[i..-1]}"
 
   _onInlineStylesResult: (event, {html, key}) =>