From 22f5d6cacbc6ba07c64273614ded837185af01ec Mon Sep 17 00:00:00 2001
From: Steve Repsher <steverep@users.noreply.github.com>
Date: Thu, 20 Apr 2023 04:59:08 -0400
Subject: [PATCH] Migrate Babel loose options to assumptions (#16245)

---
 build-scripts/bundle.cjs | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/build-scripts/bundle.cjs b/build-scripts/bundle.cjs
index a5077badad..393fbce92c 100644
--- a/build-scripts/bundle.cjs
+++ b/build-scripts/bundle.cjs
@@ -84,6 +84,12 @@ module.exports.terserOptions = ({ latestBuild, isTestBuild }) => ({
 module.exports.babelOptions = ({ latestBuild, isProdBuild, isTestBuild }) => ({
   babelrc: false,
   compact: false,
+  assumptions: {
+    privateFieldsAsProperties: true,
+    setPublicClassFields: true,
+    setSpreadProperties: true,
+  },
+
   presets: [
     !latestBuild && [
       "@babel/preset-env",
@@ -109,7 +115,7 @@ module.exports.babelOptions = ({ latestBuild, isProdBuild, isTestBuild }) => ({
     // Part of ES2018. Converts {...a, b: 2} to Object.assign({}, a, {b: 2})
     !latestBuild && [
       "@babel/plugin-proposal-object-rest-spread",
-      { loose: true, useBuiltIns: true },
+      { useBuiltIns: true },
     ],
     // Only support the syntax, Webpack will handle it.
     "@babel/plugin-syntax-import-meta",
@@ -119,9 +125,9 @@ module.exports.babelOptions = ({ latestBuild, isProdBuild, isTestBuild }) => ({
     "@babel/plugin-proposal-optional-chaining",
     "@babel/plugin-proposal-nullish-coalescing-operator",
     ["@babel/plugin-proposal-decorators", { decoratorsBeforeExport: true }],
-    ["@babel/plugin-proposal-private-methods", { loose: true }],
-    ["@babel/plugin-proposal-private-property-in-object", { loose: true }],
-    ["@babel/plugin-proposal-class-properties", { loose: true }],
+    "@babel/plugin-proposal-private-methods",
+    "@babel/plugin-proposal-private-property-in-object",
+    "@babel/plugin-proposal-class-properties",
     // Minify template literals for production
     isProdBuild && [
       "template-html-minifier",