ff4d1b4a0e
Currently, understanding dependency injection in Angular requires a lot of context and has been sited in our surveys as one of the largest points of confusion that our users have with the framework. This commit is the beginning of our approach to make debugging dependency injection in Angular easier. This commit introduces injector profiler callbacks in parts of the framework to emit injector events. It also introduces a default handler for these events. This default handler parses the stream of events to construct some data structures that will support new injector debug APIs. We have implemented a similar pattern in the past to minimize overhead. There is also the possiblity of making the internal `setInjectorProfiler` function a public debug API in the future, so that users can implement their own handlers to debug DI events. Lastly DI in Angular maps nicely to a stream of events. For production applications there is no runtime overhead. For applications in dev mode there is some additional overhead from the default profiler handling injector events and holding debug data in memory. For production applications, dead code elimination should strip all of the code used by this PR. PR Close #48639 |
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