fix corner case in hoist_props (#5223)

fixes #5222
2021-12-15 18:57:34 +00:00
parent 509896a410
commit 9e927ecc9a
3 changed files with 41 additions and 0 deletions
--- a/lib/ast.js
+++ b/lib/ast.js
@@ -1537,6 +1537,12 @@ var AST_Assign = DEFNODE("Assign", null, {
                    throw new Error("left must be assignable: " + node.TYPE);
                }
            });
+        } else if (!(this.left instanceof AST_Infinity
+            || this.left instanceof AST_NaN
+            || this.left instanceof AST_PropAccess && !this.left.optional
+            || this.left instanceof AST_SymbolRef
+            || this.left instanceof AST_Undefined)) {
+            throw new Error("left must be assignable");
        }
    },
 }, AST_Binary);