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Andrew Scott 3c6a439a6f refactor(router): extract navigation transition code to a new file (#48092)
This commit extracts the Router's navigation "transitions" to a separate
file. The goal here is twofold:

- Separate the Router's logic into more manageable chunks. Rather than
  having to always edit a 1000+ line file, this separates different
  pieces into smaller, more focused files
- More importantly, this sets the groundwork for separating the Router
  state from the individual navigation transition. That is, it would be
  good for the rxjs pipeline to _not_ modify the Router state but only
  keep track of its own intermediate stages and emit outwards during
  important events. The Router can subscribe to those events and make
  updates to its state. This would theoretically allow us to swap those
  implementations independently. That is, the Router's state management
  can be changed without changing the transition handling and
  vice-versa.

PR Close #48092
2022-11-22 16:19:44 -08:00
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