uglifier.rb in uglifier-2.2.0

- old
+ new

@@ -41,11 +41,12 @@
       :unused => true, # Drop unreferenced functions and variables
       :hoist_funs => true, # Hoist function declarations
       :hoist_vars => false, # Hoist var declarations
       :if_return => true, # Optimizations for if/return and if/continue
       :join_vars => true, # Join consecutive var statements
-      :cascade => true # Cascade sequences
+      :cascade => true, # Cascade sequences
+      :negate_iife => true # Negate immediately invoke function expressions
     }, # Apply transformations to code, set to false to skip
     :define => {}, # Define values for symbol replacement
     :enclose => false, # Enclose in output function wrapper, define replacements as key-value pairs
     :source_filename => nil, # The filename of the input file
     :source_root => nil, # The URL of the directory which contains :source_filename
@@ -184,13 +185,11 @@
       :enclose => enclose_options
     ))
   end
 
   def mangle_options
-    conditional_option(@options[:mangle], DEFAULTS[:mangle].merge(
-      :screw_ie8 => @options[:screw_ie8] || DEFAULTS[:screw_ie8]
-    ))
+    conditional_option(@options[:mangle], DEFAULTS[:mangle])
   end
 
   def compressor_options
     defaults = conditional_option(DEFAULTS[:compress],
       :global_defs => @options[:define] || {},
@@ -224,10 +223,12 @@
     end
   end
 
   def output_options
     DEFAULTS[:output].merge(@options[:output] || {}).merge(
-      :comments => comment_options)
+      :comments => comment_options,
+      :screw_ie8 => @options[:screw_ie8] || !@options[:ie_proof] || DEFAULTS[:screw_ie8]
+    ).reject! { |key,value| key == :ie_proof}
   end
 
   def source_map_options
     {
       :file => @options[:output_filename],