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The `emitDecoratorMetadata` compiler option does not have to be enabled as Angular decorators are transformed by the AOT compiler. Having the option enabled in our tests can hide issues around import preservation, as with `emitDecoratorMetadata` enabled the TypeScript compiler itself does not elide imports even if they are only used in type-positions. This is unlike having `emitDecoratorMetadata` disabled, however; in that case the Angular compiler has to actively trick TypeScript into retaining default imports when an identifier in a type-only position has been reified into a value position for DI purposes. A subsequent commit addresses a bug in default import preservation that relies on this flag being `false`. PR Close #41557
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