diff options
Diffstat (limited to 'lib/compress.js')
| -rw-r--r-- | lib/compress.js | 32 |
1 files changed, 17 insertions, 15 deletions
diff --git a/lib/compress.js b/lib/compress.js index 8a2cd4cd..ba6f809f 100644 --- a/lib/compress.js +++ b/lib/compress.js @@ -1371,21 +1371,23 @@ function Compressor(options, false_by_default) { // XXX: intentionally falling down to the next case case "==": case "!=": - if (this.left instanceof AST_UnaryPrefix - && this.left.operator == "typeof" - && this.right instanceof AST_String - && this.right.value == "undefined") { - 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") { - this.left = this.right.expression; - this.right = make_node(AST_Undefined, this.left).optimize(compressor); - if (this.operator.length == 2) this.operator += "="; + if (compressor.option("unsafe")) { + if (this.left instanceof AST_UnaryPrefix + && this.left.operator == "typeof" + && this.right instanceof AST_String + && this.right.value == "undefined") { + 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") { + this.left = this.right.expression; + this.right = make_node(AST_Undefined, this.left).optimize(compressor); + if (this.operator.length == 2) this.operator += "="; + } } break; } |