Switches the repository to TypeScript 4.3 and the latest version of tslib. This involves updating the peer dependency ranges on `typescript` for the compiler CLI and for the Bazel package. Tests for new TypeScript features have been added to ensure compatibility with Angular's ngtsc compiler. PR Close #42022
Angular Router
Managing state transitions is one of the hardest parts of building applications. This is especially true on the web, where you also need to ensure that the state is reflected in the URL. In addition, we often want to split applications into multiple bundles and load them on demand. Doing this transparently isn’t trivial.
The Angular router is designed to solve these problems. Using the router, you can declaratively specify application state, manage state transitions while taking care of the URL, and load components on demand.
Guide
Read the dev guide here.