optimize trivial IIFEs returning constants (#1530)

2017-03-02 02:11:40 -05:00
parent 9699ffb1af
commit ee3b39b909
5 changed files with 91 additions and 17 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2690,6 +2690,12 @@ merge(Compressor.prototype, {
                }
            }
        }
+        if (self.args.length == 0
+            && self.expression instanceof AST_Function
+            && self.expression.body[0] instanceof AST_Return
+            && self.expression.body[0].value.is_constant()) {
+            return self.expression.body[0].value;
+        }
        if (compressor.option("negate_iife")
            && compressor.parent() instanceof AST_SimpleStatement
            && is_iife_call(self)) {