Wrong typings generated when import() is used for types

[tianyingchun]

Bug report

Bad Typings code generated npx dts-bundle-generator src/index.ts -o index.d.ts
Sample demo is here

Input code

src/index.ts

export * from './fabric-utils';
export * from './fabric-x';

src/fabric-utils/index.ts

import { setDebugStatus } from './set-debug';

export const fabricUtils = {
  setDebugStatus,
};

src/fabric-utils/set-debug.ts

import { FabricDebugCallbackData, FabricDebugOptions } from './type.debug';

export const setDebugStatus = (options: FabricDebugOptions): FabricDebugCallbackData => {
  console.log('options', options)
  return {} as FabricDebugCallbackData;
};

src/fabric-utils/type.common.ts

export declare type Json = undefined | null | boolean | number | string | Json[] | {
	[prop: string]: Json;
};

export declare type FabricCallbackData<T extends Json = null> = {

   code: "fabric_catched_error" | string;
  
   data: T;
}

src/fabric-utils/type.debug.ts

import { FabricCallbackData } from './type.common';

export type FabricDebugOptions = {

  enableDebug: boolean;
};


export type FabricDebugCallbackData = FabricCallbackData<{

  enabled: boolean;
}>;

Expected output

// Generated by dts-bundle-generator v5.8.0

export declare type Json = undefined | null | boolean | number | string | Json[] | {
	[prop: string]: Json;
};
export declare type FabricCallbackData<T extends Json = null> = {
	
	code: "fabric_catched_error" | string;
	
	data: T;
};
export declare type FabricDebugOptions = {
	
	enableDebug: boolean;
};

export declare type FabricDebugCallbackData = FabricCallbackData<{
	
	enabled: boolean;
}>;
export declare const fabricUtils: {
	setDebugStatus: (options: FabricDebugOptions) =>  FabricDebugCallbackData;
};
export declare const fabricX: () => string;

export {};

Actual output

// Generated by dts-bundle-generator v5.8.0

export declare type Json = undefined | null | boolean | number | string | Json[] | {
	[prop: string]: Json;
};
export declare type FabricCallbackData<T extends Json = null> = {
	 
	code: "fabric_catched_error" | string;
	 
	data: T;
};
export declare type FabricDebugOptions = {
	 
	enableDebug: boolean;
};
 
export declare type FabricDebugCallbackData = FabricCallbackData<{
	 
	enabled: boolean;
}>;
export declare const fabricUtils: {
	setDebugStatus: (options: import("./type.debug").FabricDebugOptions) => import("./type.debug").FabricDebugCallbackData;
};
export declare const fabricX: () => string;

export {};

Additional context
typescript@^4.2.3, dts-bundle-generator@^5.8.0

[timocov]

Am I right that the problem is that there are import("./type.debug") statements instead of actual types?

[tianyingchun]

yes if i move these types into export file avoid import types it works fine. but i think import("./type.debug") is very common development experience. could you improve this behavior? allow us import typing from some individual typing files?

[Kilcekru]

I have a very similar issue
The interesting part is that the type itself is correctly exported, so FabricDebugCallbackData instead of import("./type.debug").FabricDebugCallbackData would immediately work

[tianyingchun]

@Kilcekru yes, FabricDebugCallbackData has been exported!:)

[timocov]

I'll try to fix it.

[timocov]

The new version 5.9 has been published with the fix.

[tianyingchun]

:) great news again!

[tianyingchun]

hi @timocov i have another question about this issue. it seems that it lose comments while import() is used for types
demo is here
while run npm run dts build it genereated an correct index.d.ts for typings. but it lose some important comments for method.

tsconfig.json with removeComment :false,
actual result is :

....
/**
 * comments for fabric utils.
 */
export declare const fabricUtils: {
	setDebugStatus: (options: FabricDebugOptions) => FabricDebugCallbackData;
};
export declare const fabricX: () => string;

export {};

expect result should be

....
 /**
 * comments for fabric utils.
 */
export declare const fabricUtils: {
  /**
   * comments for method `setDebugStatus`
   * @param options 
   * @returns 
   */
 setDebugStatus: (options: FabricDebugOptions) => FabricDebugCallbackData;
};
export declare const fabricX: () => string;

export {};