enhance side_effects (#4124)

- add documentation for `merge_vars`
2020-09-18 14:35:29 +01:00
parent 0f0759ec15
commit 38a46c86d7
3 changed files with 29 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -3892,7 +3892,8 @@ merge(Compressor.prototype, {
            if (is_undeclared_ref(expr) && global_pure_fns[expr.name]) return true;
            if (expr instanceof AST_Dot && is_undeclared_ref(expr.expression)) {
                var static_fn = static_fns[expr.expression.name];
-                return static_fn && static_fn[expr.property];
+                return static_fn && (static_fn[expr.property]
+                    || expr.expression.name == "Math" && expr.property == "random");
            }
        }
        return this.pure || !compressor.pure_funcs(this);