From 5b730f4b07b1beeeee5c036e3377d03bbb7c1d6f Mon Sep 17 00:00:00 2001
From: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
Date: Wed, 4 Jan 2023 15:15:49 +0000
Subject: [PATCH] Configure babel to transform logical assignment (#24160)

This should fix any future problems along the lines of
https://github.com/matrix-org/matrix-js-sdk/pull/3022.
---
 babel.config.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/babel.config.js b/babel.config.js
index 0c8d5affcd..da3942c6da 100644
--- a/babel.config.js
+++ b/babel.config.js
@@ -22,6 +22,13 @@ module.exports = {
         "@babel/plugin-proposal-object-rest-spread",
         "@babel/plugin-proposal-optional-chaining",
         "@babel/plugin-proposal-nullish-coalescing-operator",
+
+        // transform logical assignment (??=, ||=, &&=). preset-env doesn't
+        // normally bother with these (presumably because all the target
+        // browsers support it natively), but they make our webpack version (or
+        // something downstream of babel, at least) fall over.
+        "@babel/plugin-proposal-logical-assignment-operators",
+
         "@babel/plugin-syntax-dynamic-import",
         "@babel/plugin-transform-runtime",
     ],