export import in declare module

Suggestion

🔍 Search Terms

declare module enum export import

✅ Viability Checklist

My suggestion meets these guidelines:

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

⭐ Suggestion

Allow export import for types and values in declare module

📃 Motivating Example

declare module './back_module' {
    /** @deprecated for backward compatible */
    export import EnumType = import('./front_module').EnumType; // Suggestion feature
}
(back_module as any).RawTypeId = front_module.RawTypeId;

// ...

import { EnumType } from './back_module';
type foobar = EnumType.Value; // it's impossible with just `type =` and `let =`
type foobar2 = OnlyForEnumType<EnumType>; // it's impossible if enum is new

💻 Use Cases

I moved EnumType to a different module but I wish to keep it backward compatible.
and back_module cannot import front_module for my situation.
So I want to declare it on the other module which combines them.

Inizia dall’esempio motivante e dalla gestione esistente di declare module, import types ed export assignments. Determina come TypeScript rappresenterebbe export import sia per i tipi sia per i valori senza modificare il JavaScript emesso; il lavoro è completato quando la dichiarazione di back_module supporta l’utilizzo mostrato di EnumType mantenendo la compatibilità all’indietro.