diff --git a/packages/config-webpack/package.json b/packages/config-webpack/package.json
index c243c7314..fabafc794 100644
--- a/packages/config-webpack/package.json
+++ b/packages/config-webpack/package.json
@@ -11,6 +11,7 @@
     "@types/circular-dependency-plugin": "^5",
     "babel-loader": "^8.0.0",
     "circular-dependency-plugin": "^5.2.2",
+    "ecma-version-validator-webpack-plugin": "^1.2.1",
     "terser-webpack-plugin": "^5.1.4",
     "webpack": "^5.76.0",
     "webpack-cli": "^4.8.0",
diff --git a/packages/config-webpack/webpack.config.common.js b/packages/config-webpack/webpack.config.common.js
index 2d310ab8e..c9762daae 100644
--- a/packages/config-webpack/webpack.config.common.js
+++ b/packages/config-webpack/webpack.config.common.js
@@ -1,5 +1,8 @@
 const TerserPlugin = require('terser-webpack-plugin')
 const CircularDependencyPlugin = require('circular-dependency-plugin')
+const {
+  ECMAVersionValidatorPlugin,
+} = require('ecma-version-validator-webpack-plugin')
 
 const isProd = process.env.NODE_ENV === 'production'
 const isWatch = process.env.WATCH === 'true'
@@ -67,5 +70,6 @@ module.exports = {
     new CircularDependencyPlugin({
       failOnError: true,
     }),
+    new ECMAVersionValidatorPlugin({ ecmaVersion: 5 }), // ensure we don't accidentally break ie11 syntax.
   ],
 }
diff --git a/yarn.lock b/yarn.lock
index 93611b8e0..11d7a833e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2507,6 +2507,7 @@ __metadata:
     "@types/circular-dependency-plugin": ^5
     babel-loader: ^8.0.0
     circular-dependency-plugin: ^5.2.2
+    ecma-version-validator-webpack-plugin: ^1.2.1
     terser-webpack-plugin: ^5.1.4
     webpack: ^5.76.0
     webpack-cli: ^4.8.0
@@ -9707,6 +9708,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"ecma-version-validator-webpack-plugin@npm:^1.2.1":
+  version: 1.2.1
+  resolution: "ecma-version-validator-webpack-plugin@npm:1.2.1"
+  dependencies:
+    acorn: ^8.7.0
+  peerDependencies:
+    webpack: ^4.40.0 || ^5.0.0
+  checksum: 9a0f6d9beb600f1af054f65a52790c3784d5d4c19cb10b9ae7446682613349ade952b355cca0e60b45616e66ce9b1914d183a909ce136bb05b47f364dd6bfabf
+  languageName: node
+  linkType: hard
+
 "edge-paths@npm:^3.0.5":
   version: 3.0.5
   resolution: "edge-paths@npm:3.0.5"