60aeee7abf
Within an @NgModule it's common to include in the imports a call to a ModuleWithProviders function, for example RouterModule.forRoot(). The old ngc compiler was able to handle this pattern because it had global knowledge of metadata of not only the input compilation unit but also all dependencies. The ngtsc compiler for Ivy doesn't have this knowledge, so the pattern of ModuleWithProviders functions is more difficult. ngtsc must be able to determine which module is imported via the function in order to expand the selector scope and properly tree-shake directives and pipes. This commit implements a solution to this problem, by adding a type parameter to ModuleWithProviders through which the actual module type can be passed between compilation units. The provider side isn't a problem because the imports are always copied directly to the ngInjectorDef. PR Close #24862
fake_core is a library designed to expose some of the same symbols as @angular/core, without
requiring compilation of the whole of @angular/core. This enables unit tests for the compiler to
be written without incurring long rebuilds for every change.
@angular/coreis compiled with@angular/compiler-cli, and therefore has an implicit dependency on it. Therefore core must be rebuilt if the compiler changes.- Tests for the compiler which intend to build code that depends on
@angular/coremust have a data dependency on@angular/core. Therefore core must be built to run the compiler tests, and thus rebuilt if the compiler changes.
This rebuild cycle is expensive and slow. fake_core avoids this by exposing a subset of the
@angular/core API, which enables applications to be built by the ngtsc compiler without
needing a full version of core present at compile time.