type destructuring

Search Terms

type destructuring

Suggestion

Allow destructuring syntax when assigning type

Use Cases

Dynamically assign a type as the type of an other type's property.

Examples

Where AutocompleteService is a class, PlacesServiceStatus is an enum, and AutocompletePrediction is an interface.

What I'm doing currently:

const { AutocompleteService, PlacesServiceStatus } = google.maps.places;
type AutocompletePrediction = google.maps.places.AutocompletePrediction;

What I'd like to be able to do:

const { AutocompleteService, PlacesServiceStatus } = google.maps.places;
type { AutocompletePrediction } = google.maps.places;

Checklist

My suggestion meets these guidelines:

• This wouldn't be a breaking change in existing TypeScript/JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, etc.)
• This feature would agree with the rest of TypeScript's Design Goals.

L’issue propose d’autoriser la syntaxe de déstructuration dans une affectation de type, avec un exemple TypeScript montrant la forme souhaitée. Aucun fichier d’implémentation, point d’entrée ou test n’est nommé ; commencez par retracer la manière dont TypeScript analyse et vérifie les alias de type, puis définissez des tests qui distinguent une déstructuration de type valide de la syntaxe existante. Le travail est terminé lorsque l’exemple passe la vérification de type sans modifier le JavaScript généré.