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-rw-r--r--lib/compress.js4
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/compress.js b/lib/compress.js
index 686a8d42..52c79a73 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -6720,8 +6720,8 @@ merge(Compressor.prototype, {
self.right = self.right.left;
}
}
- if ((self.operator == "+=" || self.operator == "-=")
- && self.left.is_number(compressor)
+ if ((self.operator == "-=" || self.operator == "+="
+ && (self.left.is_boolean(compressor) || self.left.is_number(compressor)))
&& self.right instanceof AST_Number
&& self.right.getValue() === 1) {
var op = self.operator.slice(0, -1);