2e9fdbde9e
In JIT compiled apps, component definitions are compiled upon first access. For a component class `A` that extends component class `B`, the `B` component is also compiled when the `InheritDefinitionFeature` runs during the compilation of `A` before it has finalized. A problem arises when the compilation of `B` would flush the NgModule scoping queue, where the NgModule declaring `A` is still pending. The scope information would be applied to the definition of `A`, but its compilation is still in progress so requesting the component definition would compile `A` again from scratch. This "inner compilation" is correctly assigned the NgModule scope, but once the "outer compilation" of `A` finishes it would overwrite the inner compilation's definition, losing the NgModule scope information. In summary, flushing the NgModule scope queue could trigger a reentrant compilation, where JIT compilation is non-reentrant. To avoid the reentrant compilation, a compilation depth counter is introduced to avoid flushing the NgModule scope during nested compilations. Fixes #37105 PR Close #37795
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