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.

El issue propone permitir sintaxis de desestructuración en una asignación de tipos, con un ejemplo de TypeScript que muestra la forma deseada. No se nombran archivos de implementación, puntos de entrada ni pruebas; empieza siguiendo cómo TypeScript analiza y comprueba los alias de tipos, y después define pruebas que distingan la desestructuración de tipos válida de la sintaxis existente. Se considera completado cuando el ejemplo pasa la comprobación de tipos sin cambiar el JavaScript emitido.