fix emitsBoolean handling of conditional, and add handling of num

1 files changed, 4 insertions, 1 deletions

diff --git a/tools/js-optimizer.js b/tools/js-optimizer.js
index 0cd27aa8..d89145d5 100644
--- a/tools/js-optimizer.js
+++ b/tools/js-optimizer.js
@@ -750,9 +750,12 @@ function simplifyExpressions(ast) {
   }
 
   function emitsBoolean(node) {
+    if (node[0] === 'num') {
+      return node[1] === 0 || node[1] === 1;
+    }
     if (node[0] === 'binary') return node[1] in COMPARE_OPS;
     if (node[0] === 'unary-prefix') return node[1] === '!';
-    if (node[0] === 'conditional') return true;
+    if (node[0] === 'conditional') return emitsBoolean(node[2]) && emitsBoolean(node[3]);
     return false;
   }