Some types are removed if they used in ambient context

[timocov]

Bug report

Input code

type.d.ts

export interface Type1 {}
export interface Type2 {}

export declare interface ExportedType {
	Type1: { prototype: Type1 };
	Type2: { prototype: Type2 };
}

index.d.ts

import { ExportedType, Type1, Type2 } from './type';

interface _Type1 extends Type1 {}
interface _Type2 extends Type2 {}

declare module ExportedType {
  interface Type1 extends _Type1 {}
  interface Type2 extends _Type2 {}
}

export { ExportedType };

Expected output

export interface Type1 {
}
export interface Type2 {
}
export declare interface ExportedType {
	Type1: {
		prototype: Type1;
	};
	Type2: {
		prototype: Type2;
	};
}
export interface _Type1 extends Type1 {}
export interface _Type2 extends Type2 {}
export declare module ExportedType {
	interface Type1 extends _Type1 {
	}
	interface Type2 extends _Type2 {
	}
}

export {};

Actual output

export interface Type1 {
}
export interface Type2 {
}
export declare interface ExportedType {
	Type1: {
		prototype: Type1;
	};
	Type2: {
		prototype: Type2;
	};
}
export declare module ExportedType {
	interface Type1 extends _Type1 {
	}
	interface Type2 extends _Type2 {
	}
}

export {};

Additional context

The issue came from Dexie.js (I think that is one of the reasons why they will not be able to upgrade to the latest version). The issue was introduced in v6.5.0 (see 56b22bc).

[timocov]

Released in v8.0.0.