Enable frozen string literals.

Make all string literals immutable by default.

app/controllers/admin/users_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Admin
   class UsersController < ApplicationController
     def edit

app/controllers/api_keys_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ApiKeysController < ApplicationController
   before_action :requires_reauthentication
   respond_to :html, :json, :xml

app/controllers/application_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ApplicationController < ActionController::Base
   include Pundit
   helper_method :search_params

app/controllers/artist_commentaries_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ArtistCommentariesController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/artist_commentary_versions_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ArtistCommentaryVersionsController < ApplicationController
   respond_to :html, :xml, :json
 

app/controllers/artist_urls_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ArtistUrlsController < ApplicationController
   respond_to :js, :json, :xml, :html
 

app/controllers/artist_versions_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ArtistVersionsController < ApplicationController
   respond_to :html, :xml, :json
 

app/controllers/artists_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ArtistsController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/autocomplete_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AutocompleteController < ApplicationController
   respond_to :xml, :json
 

app/controllers/bans_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class BansController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/bulk_update_requests_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class BulkUpdateRequestsController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/comment_votes_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CommentVotesController < ApplicationController
   respond_to :js, :json, :xml, :html
 

app/controllers/comments_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CommentsController < ApplicationController
   respond_to :html, :xml, :json, :atom
   respond_to :js, only: [:new, :update, :destroy, :undelete]

app/controllers/counts_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CountsController < ApplicationController
   respond_to :html, :xml, :json
 

app/controllers/delayed_jobs_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class DelayedJobsController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/dmails_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class DmailsController < ApplicationController
   respond_to :html, :xml, :js, :json
 

app/controllers/dtext_links_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class DtextLinksController < ApplicationController
   respond_to :html, :xml, :json
 

app/controllers/dtext_previews_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class DtextPreviewsController < ApplicationController
   def create
     @inline = params[:inline].to_s.truthy?

app/controllers/emails_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class EmailsController < ApplicationController
   before_action :requires_reauthentication, only: [:edit, :update]
   respond_to :html, :xml, :json

app/controllers/explore/posts_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Explore
   class PostsController < ApplicationController
     respond_to :html, :xml, :json

app/controllers/favorite_group_orders_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class FavoriteGroupOrdersController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/favorite_groups_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class FavoriteGroupsController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/favorites_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class FavoritesController < ApplicationController
   respond_to :js, :json, :html, :xml
 

app/controllers/forum_post_votes_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ForumPostVotesController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/forum_posts_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ForumPostsController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/forum_topic_visits_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ForumTopicVisitsController < ApplicationController
   respond_to :xml, :json
 

app/controllers/forum_topics_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ForumTopicsController < ApplicationController
   respond_to :html, :xml, :json
   respond_to :atom, only: [:index, :show]

app/controllers/ip_addresses_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class IpAddressesController < ApplicationController
   respond_to :html, :xml, :json
 

app/controllers/ip_bans_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class IpBansController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/ip_geolocations_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class IpGeolocationsController < ApplicationController
   respond_to :html, :json, :xml
 

app/controllers/iqdb_queries_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class IqdbQueriesController < ApplicationController
   respond_to :html, :json, :xml, :js
 

app/controllers/legacy_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class LegacyController < ApplicationController
   respond_to :json, :xml
 

app/controllers/maintenance/user/count_fixes_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Maintenance
   module User
     class CountFixesController < ApplicationController

app/controllers/maintenance/user/deletions_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Maintenance
   module User
     class DeletionsController < ApplicationController

app/controllers/maintenance/user/email_notifications_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Maintenance
   module User
     class EmailNotificationsController < ApplicationController

app/controllers/media_assets_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class MediaAssetsController < ApplicationController
   respond_to :html, :json, :xml
 

app/controllers/media_metadata_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class MediaMetadataController < ApplicationController
   respond_to :json, :xml
 

app/controllers/mock_services_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class MockServicesController < ApplicationController
   skip_forgery_protection
   respond_to :json

app/controllers/mod_actions_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ModActionsController < ApplicationController
   respond_to :html, :xml, :json
 

app/controllers/moderation_reports_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ModerationReportsController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/moderator/dashboards_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Moderator
   class DashboardsController < ApplicationController
     def show

app/controllers/moderator/ip_addrs_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Moderator
   class IpAddrsController < ApplicationController
     respond_to :html, :json

app/controllers/moderator/post/posts_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Moderator
   module Post
     class PostsController < ApplicationController

app/controllers/modqueue_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ModqueueController < ApplicationController
   respond_to :html, :json, :xml
   layout "sidebar"

app/controllers/news_updates_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class NewsUpdatesController < ApplicationController
   respond_to :html, :json, :xml
 

app/controllers/note_previews_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class NotePreviewsController < ApplicationController
   respond_to :json
 

app/controllers/note_versions_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class NoteVersionsController < ApplicationController
   respond_to :html, :xml, :json
 

app/controllers/notes_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class NotesController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/password_resets_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PasswordResetsController < ApplicationController
   respond_to :html, :xml, :json
 

app/controllers/passwords_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PasswordsController < ApplicationController
   respond_to :html, :xml, :json
 

app/controllers/pixiv_ugoira_frame_data_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PixivUgoiraFrameDataController < ApplicationController
   respond_to :json, :xml
 

app/controllers/pool_elements_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PoolElementsController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/pool_orders_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PoolOrdersController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/pool_versions_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PoolVersionsController < ApplicationController
   respond_to :html, :xml, :json
   before_action :check_availabililty

app/controllers/pools_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PoolsController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/post_appeals_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PostAppealsController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/post_approvals_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PostApprovalsController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/post_disapprovals_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PostDisapprovalsController < ApplicationController
   respond_to :js, :html, :json, :xml
 

app/controllers/post_events_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PostEventsController < ApplicationController
   respond_to :html, :xml, :json
 

app/controllers/post_flags_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PostFlagsController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/post_regenerations_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PostRegenerationsController < ApplicationController
   respond_to :xml, :json, :html
 

app/controllers/post_replacements_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PostReplacementsController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/post_versions_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PostVersionsController < ApplicationController
   before_action :check_availabililty
   around_action :set_timeout

app/controllers/post_votes_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PostVotesController < ApplicationController
   respond_to :js, :json, :xml, :html
 

app/controllers/posts_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PostsController < ApplicationController
   respond_to :html, :xml, :json, :js
   layout "sidebar"

app/controllers/rate_limits_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RateLimitsController < ApplicationController
   respond_to :html, :json, :xml
 

app/controllers/recommended_posts_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RecommendedPostsController < ApplicationController
   respond_to :html, :json, :xml, :js
 

app/controllers/related_tags_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RelatedTagsController < ApplicationController
   respond_to :json, :xml, :js, :html
 

app/controllers/robots_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RobotsController < ApplicationController
   respond_to :text
 

app/controllers/saved_searches_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class SavedSearchesController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/sessions_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class SessionsController < ApplicationController
   respond_to :html, :json
   skip_forgery_protection only: :create, if: -> { !request.format.html? }

app/controllers/sources_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class SourcesController < ApplicationController
   respond_to :js, :json, :xml
 

app/controllers/static_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class StaticController < ApplicationController
   respond_to :html, :json, :xml
 

app/controllers/status_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class StatusController < ApplicationController
   respond_to :html, :json, :xml
 

app/controllers/tag_aliases_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class TagAliasesController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/tag_implications_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class TagImplicationsController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/tags_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class TagsController < ApplicationController
   respond_to :html, :xml, :json
 

app/controllers/uploads_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class UploadsController < ApplicationController
   respond_to :html, :xml, :json, :js
   skip_before_action :verify_authenticity_token, only: [:preprocess]

app/controllers/user_events_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class UserEventsController < ApplicationController
   respond_to :html, :json, :xml
 

app/controllers/user_feedbacks_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class UserFeedbacksController < ApplicationController
   respond_to :html, :xml, :json, :js
 

app/controllers/user_name_change_requests_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class UserNameChangeRequestsController < ApplicationController
   respond_to :html, :json, :xml
 

app/controllers/user_sessions_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class UserSessionsController < ApplicationController
   respond_to :html, :json, :xml
 

app/controllers/user_upgrades_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class UserUpgradesController < ApplicationController
   respond_to :js, :html, :json, :xml
 

app/controllers/users_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class UsersController < ApplicationController
   respond_to :html, :xml, :json
 

app/controllers/webhooks_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class WebhooksController < ApplicationController
   skip_forgery_protection only: :receive
   rescue_with Stripe::SignatureVerificationError, status: 400

app/controllers/wiki_page_versions_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class WikiPageVersionsController < ApplicationController
   respond_to :html, :xml, :json
   layout "sidebar"

app/controllers/wiki_pages_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class WikiPagesController < ApplicationController
   respond_to :html, :xml, :json, :js
   layout "sidebar"