diff options
Diffstat (limited to 'lib/compress.js')
| -rw-r--r-- | lib/compress.js | 22 |
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 += "="; |