ed1db40322
Previously ngtsc would use a tuple of class types for listing metadata in .d.ts files. For example, an @NgModule's declarations might be represented with the type: [NgIf, NgForOf, NgClass] If the module had no declarations, an empty tuple [] would be produced. This has two problems. 1. If the class type has generic type parameters, TypeScript will complain that they're not provided. 2. The empty tuple type is not actually legal. This commit addresses both problems. 1. Class types are now represented using the `typeof` operator, so the above declarations would be represented as: [typeof NgIf, typeof NgForOf, typeof NgClass]. Since typeof operates on a value, it doesn't require generic type arguments. 2. Instead of an empty tuple, `never` is used to indicate no metadata. PR Close #24862
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