Drop all `console` statements properly

Because the base reference can be an member expression as well, we have to dig a bit deeper to find the leftmost base reference.

Fixes #451

2 files changed, 34 insertions, 5 deletions

diff --git a/lib/compress.js b/lib/compress.js
index ae20d485..27285984 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -1873,11 +1873,16 @@ merge(Compressor.prototype, {
             }
         }
         if (compressor.option("drop_console")) {
-            if (self.expression instanceof AST_PropAccess &&
-                self.expression.expression instanceof AST_SymbolRef &&
-                self.expression.expression.name == "console" &&
-                self.expression.expression.undeclared()) {
-                return make_node(AST_Undefined, self).transform(compressor);
+            if (self.expression instanceof AST_PropAccess) {
+                var name = self.expression.expression;
+                while (name.expression) {
+                    name = name.expression;
+                }
+                if (name instanceof AST_SymbolRef
+                    && name.name == "console"
+                    && name.undeclared()) {
+                    return make_node(AST_Undefined, self).transform(compressor);
+                }
             }
         }
         return self.evaluate(compressor)[0];
diff --git a/test/compress/drop-console.js b/test/compress/drop-console.js
new file mode 100644
index 00000000..162b339c
--- /dev/null
+++ b/test/compress/drop-console.js
@@ -0,0 +1,24 @@
+drop_console_1: {

+    options = {};

+    input: {

+        console.log('foo');

+        console.log.apply(console, arguments);

+    }

+    expect: {

+        console.log('foo');

+        console.log.apply(console, arguments);

+    }

+}

+

+drop_console_1: {

+    options = { drop_console: true };

+    input: {

+        console.log('foo');

+        console.log.apply(console, arguments);

+    }

+    expect: {

+        // with regular compression these will be stripped out as well

+        void 0;

+        void 0;

+    }

+}