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Reflect

Reflect.metadata​

extfor
Reflect.decorate
Reflect.defineMetadata
Reflect.getMetadata
Reflect.hasMetadata
Reflect.getOwnMetadata
Reflect.hasOwnMetadata
Reflect.metadata返回 decorator
@Reflect.metadata(metadataKey, metadataValue)
class C {
  // apply metadata via a decorator to a method (property)
  @Reflect.metadata(metadataKey, metadataValue)
  method() {
  }
}