21e24d1474
Previously, the incremental flow for NgCompiler was simple: when creating a new NgCompiler instance, the consumer could pass state from a previous compilation, which would cause the new compilation to be performed incrementally. "Local" information about TypeScript files which had not changed would be passed from the old compilation to the new and reused, while "global" information would always be recalculated. However, this flow could be made more efficient in certain cases, such as when no TypeScript files are changed in a new compilation. In this case, _all_ information extracted during the first compilation is reusable. Doing this involves reusing the previous `NgCompiler` instance (the container for such global information) and updating it, instead of creating a new one for the next compilation. This approach works cleanly, but complicates the lifecycle of `NgCompiler`. To prevent consumers from having to deal with the mechanics of reuse vs incremental steps of `NgCompiler`, a new `CompilationTicket` mechanism is added in this commit. Consumers obtain a `CompilationTicket` via one of several code paths depending on the nature of the incoming compilation, and use the `CompilationTicket` to obtain an `NgCompiler` instance. This instance may be a fresh compilation, a new `NgCompiler` for an incremental compilation, or an existing `NgCompiler` that's been updated to optimally process a resource-only change. Consumers can use the new `NgCompiler` without knowledge of its provenance. PR Close #40561
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