[rubocop] frozen strings

.rubocop.yml

@@ -30,3 +30,8 @@ Metrics/BlockLength:
     - 'Rakefile'
     - '**/*.rake'
     - 'spec/**/*_spec.rb'
+
+Style/FrozenStringLiteralComment:
+  Enabled: true
+  Exclude:
+    - 'spec/**/*.rb'

lib/message_bus_client.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'excon'
 require 'json'
 require 'securerandom'

lib/message_bus_client/configuration.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module MessageBusClient::Configuration
   def self.included(module_)
     module_.extend(ClassMethods)

lib/message_bus_client/connection.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module MessageBusClient::Connection
   # The connection is in the initialised state.
   INITIALISED = 0
@@ -105,10 +107,10 @@ def headers
 
   # Gets the URI to poll the server with
   def server_endpoint
-    endpoint = "#{@base_url}/message-bus/#{@client_id}/poll"
+    endpoint = +"#{@base_url}/message-bus/#{@client_id}/poll"
     endpoint << '?dlp=t' unless self.class.long_polling
 
-    endpoint
+    endpoint.freeze
   end
 
   # Handles the response from the connection.

lib/message_bus_client/message_handler.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module MessageBusClient::MessageHandler
   SubscribedChannel = Struct.new(:callbacks, :last_id) do
     def initialize(last_id = -1)
@@ -13,7 +15,7 @@ def callback(payload)
   end
 
   # The chunk separator for chunked messages.
-  CHUNK_SEPARATOR = "\r\n|\r\n".freeze
+  CHUNK_SEPARATOR = "\r\n|\r\n"
 
   def initialize(base_url)
     super
@@ -23,7 +25,7 @@ def initialize(base_url)
     @subscribed_channels.default_proc = proc do |hash, key|
       hash[key] = SubscribedChannel.new
     end
-    @payload = ''
+    @payload = +''
   end
 
   def subscribe(channel, &callback)

lib/message_bus_client/version.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class MessageBusClient
-  VERSION = '0.2.0'.freeze
+  VERSION = '0.2.0'
 end