Here we go

middleman-core/lib/middleman-core/core_extensions/data.rb

@@ -11,7 +11,7 @@ module Middleman
 
       # Make the internal `data_store` method available as `app.data`
       expose_to_application data: :data_store
-    
+
       # Exposes `data` to templates
       expose_to_template data: :data_store
 

middleman-core/lib/middleman-core/extension.rb

@@ -198,7 +198,7 @@ module Middleman
       end
 
       # Takes a method within this extension and exposes it inside the scope
-      # of the config.rb sandbox. 
+      # of the config.rb sandbox.
       # @example with Hash:
       #   expose_to_config global_name: :local_name
       # @example with Array:
@@ -405,7 +405,7 @@ module Middleman
         elsif g.is_a? Symbol
           definition = method(g)
 
-          if definition.arity === 0
+          if definition.arity == 0
             send(g)
           else
             send(g, resources)
@@ -421,7 +421,7 @@ module Middleman
         if g.is_a? Symbol
           definition = method(g)
 
-          g = if definition.arity === 0
+          g = if definition.arity == 0
             send(g)
           else
             send(g, resources)

middleman-core/lib/middleman-core/renderers/haml.rb

@@ -51,10 +51,9 @@ module Middleman
 
       def add_exposed_to_context(context)
         super
-        
+
         context.init_haml_helpers if context.respond_to?(:init_haml_helpers)
       end
-
     end
   end
 end

middleman-core/lib/middleman-core/renderers/kramdown.rb

@@ -6,7 +6,7 @@ module Middleman
     class KramdownTemplate < ::Tilt::KramdownTemplate
       def evaluate(scope, *)
         @output ||= begin
-          MiddlemanKramdownHTML.scope = ::Middleman::Renderers::Haml.last_haml_scope || scope
+          MiddlemanKramdownHTML.scope = (defined?(::Middleman::Renderers::Haml) && ::Middleman::Renderers::Haml.last_haml_scope) ? ::Middleman::Renderers::Haml.last_haml_scope : scope
 
           output, warnings = MiddlemanKramdownHTML.convert(@engine.root, @engine.options)
           @engine.warnings.concat(warnings)

middleman-core/lib/middleman-core/sitemap/extensions/redirects.rb

@@ -7,7 +7,6 @@ module Middleman
       # Manages the list of proxy configurations and manipulates the sitemap
       # to include new resources based on those configurations
       class Redirects < Extension
-
         # Expose `create_redirect` to config as `redirect`
         expose_to_config redirect: :create_redirect
 

middleman-core/lib/middleman-core/sitemap/extensions/request_endpoints.rb

@@ -4,7 +4,6 @@ module Middleman
   module Sitemap
     module Extensions
       class RequestEndpoints < Extension
-
         # Expose `create_endpoint` to config as `endpoint`
         expose_to_config endpoint: :create_endpoint