Idea: Can declaration emit synthesize type aliases?

Object types can be very large and in (e.g.) a react project that makes heavy use of type inference, it's not uncommon to have to refer to a type that is either not imported or is simply anonymous (e.g. a props type). When these appear in multiple places in a declaration file, they tend to expand it considerably. Perhaps we could just synthesize type aliases for them?

• We'd have to be careful not to change the exported API shape
• We could use a heuristic to skip the work for small types (e.g. < 20 characters)
• Even if we didn't wait until the second use of a type to decide to extract it, we'd be adding ~4 tokens per type (type id = and id at the use site)

L’issue propose de synthétiser des alias de type lors de l’émission des déclarations pour les grands types d’objet anonymes répétés. Aucun fichier, test ou point d’entrée n’est nommé ; commencez par cartographier l’implémentation de l’émission des déclarations et évaluez l’heuristique de taille indiquée. Le travail est considéré comme terminé lorsque l’expansion des fichiers de déclaration est réduite sans modifier la forme de l’API exportée.