Angular Update Guide recommends specific steps to follow under the Before Updating section, as shown:
There can be several kinds of updates you may need to make to your code before attempting an update.
Namespace Changes: The first item on the preceding list is notifying us that the namespaces of certain animation services and tools may have changes. Such changes should be low risk and accomplished quickly with the use of the Global search tool in VS Code. Let's see how you can quickly observe all usages of '@angular/core' in your app. Look at the next screenshot: