Early return from CoffeeScript.compile when header not enabled

src/coffee-script.coffee

@@ -34,12 +34,13 @@ exports.helpers = require './helpers'
 exports.compile = compile = (code, options = {}) ->
   {merge} = exports.helpers
   try
-    header = "// Generated by CoffeeScript #{@VERSION}\n" if options.header
     js = (parser.parse lexer.tokenize code).compile options
-    "#{[header]}#{js}"
+    return js unless options.header
   catch err
     err.message = "In #{options.filename}, #{err.message}" if options.filename
     throw err
+  header = "Generated by CoffeeScript #{@VERSION}"
+  "// #{header}\n#{js}"
 
 # Tokenize a string of CoffeeScript code, and return the array of tokens.
 exports.tokens = (code, options) ->