Add option to allow return outside of functions.

Close #288

2 files changed, 8 insertions, 4 deletions

diff --git a/bin/uglifyjs b/bin/uglifyjs
index 3a3318b2..fc33f96f 100755
--- a/bin/uglifyjs
+++ b/bin/uglifyjs
@@ -64,6 +64,7 @@ You need to pass an argument to this option to specify the name that your module
     .describe("v", "Verbose")
     .describe("V", "Print version number and exit.")
     .describe("noerr", "Don't throw an error for unknown options in -c, -b or -m.")
+    .describe("bare-returns", "Allow return outside of functions.  Useful when minifying CommonJS modules.")
 
     .alias("p", "prefix")
     .alias("o", "output")
@@ -100,6 +101,7 @@ You need to pass an argument to this option to specify the name that your module
     .boolean("lint")
     .boolean("V")
     .boolean("noerr")
+    .boolean("bare-returns")
 
     .wrap(80)
 
@@ -275,9 +277,10 @@ async.eachLimit(files, 1, function (file, cb) {
             else {
                 try {
                     TOPLEVEL = UglifyJS.parse(code, {
-                        filename   : file,
-                        toplevel   : TOPLEVEL,
-                        expression : ARGS.expr,
+                        filename     : file,
+                        toplevel     : TOPLEVEL,
+                        expression   : ARGS.expr,
+                        bare_returns : ARGS.bare_returns,
                     });
                 } catch(ex) {
                     if (ex instanceof UglifyJS.JS_Parse_Error) {
diff --git a/lib/parse.js b/lib/parse.js
index de982b1e..931e5f66 100644
--- a/lib/parse.js
+++ b/lib/parse.js
@@ -609,6 +609,7 @@ function parse($TEXT, options) {
         toplevel       : null,
         expression     : false,
         html5_comments : true,
+        bare_returns   : false,
     });
 
     var S = {
@@ -788,7 +789,7 @@ function parse($TEXT, options) {
                 return if_();
 
               case "return":
-                if (S.in_function == 0)
+                if (S.in_function == 0 && !options.bare_returns)
                     croak("'return' outside of function");
                 return new AST_Return({
                     value: ( is("punc", ";")