104d30507a
@angular/core is unique in that it defines the Angular decorators (@Component, @Directive, etc). Ordinarily ngtsc looks for imports from @angular/core in order to identify these decorators. Clearly within core itself, this strategy doesn't work. Instead, a special constant ITS_JUST_ANGULAR is declared within a known file in @angular/core. If ngtsc sees this constant it knows core is being compiled and can ignore the imports when evaluating decorators. Additionally, when compiling decorators ngtsc will often write an import to @angular/core for needed symbols. However @angular/core cannot import itself. This change creates a module within core to export all the symbols needed to compile it and adds intelligence within ngtsc to write relative imports to that module, instead of absolute imports to @angular/core. PR Close #24677
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