fix: incorrect constantViolations with destructuring (#16522)

Co-authored-by: Huáng Jùnliàng <jlhwung@gmail.com>
babel · Jun 4, 2024 · 4463aa5 · 4463aa5
1 parent c2acb5d
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diff --git a/packages/babel-traverse/src/scope/index.ts b/packages/babel-traverse/src/scope/index.ts
@@ -833,7 +833,7 @@ class Scope {
 
         // A redeclaration of an existing variable is a modification
         if (local) {
-          this.registerConstantViolation(bindingPath);
+          local.reassign(bindingPath);
         } else {
           this.bindings[name] = new Binding({
             identifier: id,

diff --git a/packages/babel-traverse/test/scope.js b/packages/babel-traverse/test/scope.js
@@ -1138,4 +1138,25 @@ describe("scope", () => {
       `);
     });
   });
+
+  describe("constantViolations", () => {
+    it("var redeclarations should not be treated as constantViolations", () => {
+      const program = getPath(`
+        function v() { }
+        function f() {
+          var a = 1;
+          var {
+            currentPoint: a,
+            centp: v,
+          } = {};
+        }
+      `);
+
+      const bindingV = program.scope.getBinding("v");
+      expect(bindingV.constantViolations).toHaveLength(0);
+
+      const bindingA = program.get("body.1.body").scope.getBinding("a");
+      expect(bindingA.constantViolations).toHaveLength(1);
+    });
+  });
 });