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.

La issue propone di consentire la sintassi di destrutturazione in un’assegnazione di tipo, con un esempio TypeScript che mostra la forma desiderata. Non vengono indicati file di implementazione, punti di ingresso o test; inizia tracciando come TypeScript analizza e verifica gli alias di tipo, quindi definisci test che distinguano la destrutturazione di tipo valida dalla sintassi esistente. Il lavoro è completato quando l’esempio supera il controllo dei tipi senza modificare il JavaScript emesso.