Fix es5 build (#7319)

build-scripts/bundle.js

@@ -54,7 +54,11 @@ module.exports.babelOptions = ({ latestBuild }) => ({
   presets: [
     !latestBuild && [
       require("@babel/preset-env").default,
-      { modules: false, useBuiltIns: "entry", corejs: 3 },
+      {
+        modules: false,
+        useBuiltIns: "entry",
+        corejs: "3.6",
+      },
     ],
     require("@babel/preset-typescript").default,
   ].filter(Boolean),
@@ -66,7 +70,8 @@ module.exports.babelOptions = ({ latestBuild }) => ({
     ],
     // Only support the syntax, Webpack will handle it.
     "@babel/plugin-syntax-import-meta",
-    "@babel/syntax-dynamic-import",
+    "@babel/plugin-syntax-dynamic-import",
+    "@babel/plugin-syntax-top-level-await",
     "@babel/plugin-proposal-optional-chaining",
     "@babel/plugin-proposal-nullish-coalescing-operator",
     [