wip

Author: silesky

packages/browser/package.json

@@ -80,6 +80,7 @@
     "aws-sdk": "^2.814.0",
     "circular-dependency-plugin": "^5.2.2",
     "compression-webpack-plugin": "^8.0.1",
+    "ecma-version-validator-webpack-plugin": "^1.2.1",
     "execa": "^4.1.0",
     "flat": "^5.0.2",
     "fs-extra": "^9.0.1",

packages/browser/webpack.config.js

@@ -5,7 +5,9 @@ const CompressionPlugin = require('compression-webpack-plugin')
 const BundleAnalyzerPlugin =
   require('webpack-bundle-analyzer').BundleAnalyzerPlugin
 const CircularDependencyPlugin = require('circular-dependency-plugin')
-
+const {
+  ECMAVersionValidatorPlugin,
+} = require('ecma-version-validator-webpack-plugin')
 const isProd = process.env.NODE_ENV === 'production'
 
 const ASSET_PATH = process.env.ASSET_PATH
@@ -30,6 +32,10 @@ const plugins = [
   new CircularDependencyPlugin({
     failOnError: true,
   }),
+  // ensure our js bundle only contains syntax supported in ie11.
+  // This does not check polyfills.
+  // This is especially neccessary because by default, node_modules are not transformed.
+  new ECMAVersionValidatorPlugin({ ecmaVersion: 5 }),
 ]
 
 if (process.env.ANALYZE) {

yarn.lock

@@ -6268,6 +6268,7 @@ __metadata:
     circular-dependency-plugin: ^5.2.2
     compression-webpack-plugin: ^8.0.1
     dset: ^3.1.4
+    ecma-version-validator-webpack-plugin: ^1.2.1
     execa: ^4.1.0
     flat: ^5.0.2
     fs-extra: ^9.0.1