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-rw-r--r--lib/compress.js22
1 files changed, 13 insertions, 9 deletions
diff --git a/lib/compress.js b/lib/compress.js
index ba6f809f..ca7bfe51 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -1371,19 +1371,23 @@ function Compressor(options, false_by_default) {
// XXX: intentionally falling down to the next case
case "==":
case "!=":
- if (compressor.option("unsafe")) {
- if (this.left instanceof AST_UnaryPrefix
- && this.left.operator == "typeof"
- && this.right instanceof AST_String
- && this.right.value == "undefined") {
+ if (this.left instanceof AST_UnaryPrefix
+ && this.left.operator == "typeof"
+ && this.right instanceof AST_String
+ && this.right.value == "undefined") {
+ if (!(this.left.expression instanceof AST_SymbolRef)
+ || !this.left.expression.undeclared()) {
this.left = this.left.expression;
this.right = make_node(AST_Undefined, this.right).optimize(compressor);
if (this.operator.length == 2) this.operator += "=";
}
- else if (this.left instanceof AST_String
- && this.left.value == "undefined"
- && this.right instanceof AST_UnaryPrefix
- && this.right.operator == "typeof") {
+ }
+ else if (this.left instanceof AST_String
+ && this.left.value == "undefined"
+ && this.right instanceof AST_UnaryPrefix
+ && this.right.operator == "typeof") {
+ if (!(this.right.expression instanceof AST_SymbolRef)
+ || !this.right.expression.undeclared()) {
this.left = this.right.expression;
this.right = make_node(AST_Undefined, this.left).optimize(compressor);
if (this.operator.length == 2) this.operator += "=";