From a6c0300362da60269ec72a53c33afdf1d15ac29a Mon Sep 17 00:00:00 2001
From: LeoTM <1881059+leotm@users.noreply.github.com>
Date: Tue, 20 Aug 2024 13:35:49 +0100
Subject: [PATCH] feat(ses): update Hermes transform to error on 'this'
 expression

---
 packages/ses/scripts/hermesTransforms.js | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/packages/ses/scripts/hermesTransforms.js b/packages/ses/scripts/hermesTransforms.js
index 033dce50e6..80849b5fef 100644
--- a/packages/ses/scripts/hermesTransforms.js
+++ b/packages/ses/scripts/hermesTransforms.js
@@ -17,6 +17,18 @@ const asyncArrowEliminator = {
     if (path.node.async) {
       let body = path.node.body;
 
+      const startLine = path.node.loc.start.line;
+      const endLine = path.node.loc.end.line;
+
+      path.traverse({
+        ThisExpression(innerPath) {
+          // throw path.buildCodeFrameError("..."); // https://github.com/babel/babel/issues/8617
+          throw Error(
+            `${startLine}:${endLine} Hermes makeBundle transform doesn't support 'this' keyword in async arrow functions`,
+          );
+        },
+      });
+
       // In case it's a ()=>expression style arrow function
       if (!t.isBlockStatement(body)) {
         body = t.blockStatement([t.returnStatement(body)]);