From 1e5e75746d8d7a28634cabda2592cb4212320f1f Mon Sep 17 00:00:00 2001
From: Sathya Gunasekaran <gsathya.ceg@gmail.com>
Date: Fri, 3 Mar 2023 13:35:04 +0000
Subject: [PATCH] [hir] Handle LHS of AssignmentExpression specially

Babel has a bug where it doesn't visit the LHS of an AssignmentExpression if
it's an Identifier. Work around it by explicitly visiting it.
---
 compiler/forget/src/HIR/BuildHIR.ts | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/compiler/forget/src/HIR/BuildHIR.ts b/compiler/forget/src/HIR/BuildHIR.ts
index 0f78212dc0..c5eea2ea2e 100644
--- a/compiler/forget/src/HIR/BuildHIR.ts
+++ b/compiler/forget/src/HIR/BuildHIR.ts
@@ -2160,6 +2160,17 @@ function gatherCapturedDeps(
   });
 
   function visit(path: NodePath<Expression>): void {
+    // Babel has a bug where it doesn't visit the LHS of an
+    // AssignmentExpression if it's an Identifier. Work around it by explicitly
+    // visiting it.
+    if (path.isAssignmentExpression()) {
+      const left = path.get("left");
+      if (left.isIdentifier()) {
+        visit(left);
+      }
+      return;
+    }
+
     let obj = path;
     while (obj.isMemberExpression()) {
       obj = obj.get("object");