Warning
Angular version 6 is officially outdated, so this version is not supported anymore.
If you come from the old angular-async-local-storage package, you will need to migrate to the new @ngx-pwa/local-storage package first before upgrading to v6.
For shorter code and more consistency, the Async prefix has been dropped everywhere.
You can easily and quickly migrate by doing a global search/replace of:
AsyncLocalStorage=>LocalStorageAsyncLocalDatabase=>LocalDatabaseALSGetItemOptions=>LSGetItemOptions
In most cases, you are probably only using the first one.
LocalStorageModule is no longer needed and so it is removed. Services are provided directly when injected in Angular >=6.
Just delete the LocalStorageModule import in your AppModule.
Done.