account for declaration assignment in collapse_vars (#2859)

fixes #2858
2018-02-01 15:09:53 +08:00
parent 2a4c68be4f
commit 102f994b9d
2 changed files with 35 additions and 0 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -990,6 +990,7 @@ merge(Compressor.prototype, {
                    || node instanceof AST_Debugger
                    || node instanceof AST_IterationStatement && !(node instanceof AST_For)
                    || node instanceof AST_Try
+                    || node instanceof AST_VarDef && node.value && side_effects && !references_in_scope(node.name.definition())
                    || node instanceof AST_With
                    || parent instanceof AST_For && node !== parent.init
                    || (side_effects || !replace_all)