From 146c2a56be4993ef719397acd68da1c48e53f07a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicol=C3=B2=20Ribaudo?= <nicolo.ribaudo@gmail.com>
Date: Fri, 7 Oct 2022 17:38:37 +0200
Subject: [PATCH] Fix CI error

---
 packages/babel-traverse/src/scope/binding.ts | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/packages/babel-traverse/src/scope/binding.ts b/packages/babel-traverse/src/scope/binding.ts
index dae019696e7b..6f70f74242c6 100644
--- a/packages/babel-traverse/src/scope/binding.ts
+++ b/packages/babel-traverse/src/scope/binding.ts
@@ -44,7 +44,22 @@ export default class Binding {
     this.path = path;
     this.kind = kind;
 
-    if ((kind === "var" || kind === "hoisted") && isDeclaredInLoop(path)) {
+    if (
+      (kind === "var" || kind === "hoisted") &&
+      // For some reason, rollup removes the path argument from this
+      // call. Add an unreachable IIFE (that rollup doesn't know is
+      // unreachable) with side effects, to prevent it from messing
+      // up with arguments.
+      // You can reproduce this with
+      //   BABEL_8_BREAKING=true make prepublish-build
+      // TODO(@nicolo-ribaudo): Investigate.
+      isDeclaredInLoop(
+        path ||
+          (() => {
+            throw new Error("Internal Babel error: unreachable ");
+          })(),
+      )
+    ) {
       this.reassign(path);
     }