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David Neil
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In many JS runtimes all closures created in the same scope share a context this means that data held in one of the closures is not collected until all of the closures are collected. This change prevents the returned promise from holding a reaction that holds the entire `Router` object in memory.
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.