When you use a dependency that is packaged with CommonJS, it can result in larger slower applications
Starting with version 10, Angular now warns you when your build pulls in one of these bundles. If you’ve started seeing these warnings for your dependencies, let your dependency know that you’d prefer an ECMAScript module (ESM) bundle.
Here is an official documentation – Configuring CommonJS dependencies
In your angular.json file look for the build object and add
allowedCommonJsDependencies
as shown below –
"build": {
"builder": "@angular-devkit/build-angular:browser",
"options": {
"allowedCommonJsDependencies": [
"rxjs-compat",
... few more commonjs dependencies ...
]
...
}
...
},