Uncaught TypeError: Class constructor Platform cannot be invoked without 'new'

I had the same issue. Check your cdk version in your package.json

I solved installing an older version of cdk 10:

npm i @angular/[email protected] --save

In case someone has the same issue while trying to implement material design with angular material, rollback both material and cdk packages to an older version with:

npm i @angular/[email protected] @angular/[email protected] --save

I hope someone proposes a better approach that enables using the latest versions.