I’m developing a Node.js app (MyApp) and a Node.js module (MyTools) simultaneously on a Windows 2019 server with node v18.16.0.

You can find the full code on GitHub: https://github.com/zero2411/myapp

I’m using npm link to add MyTools to MyApp, but I’m encountering an error on line 1 in myapp.ts:

Cannot find module 'mytools' or its corresponding type declarations.ts(2307)

Directory Structure

myapp/
├── node_modules/
│   └── mytools/ (linked)
│       ├── mytools.d.ts
│       ├── mytools.d.ts.map
│       ├── mytools.js
│       ├── mytools.ts
│       ├── package.json
│       └── tsconfig.json
├── myapp.ts
├── myapp.js
├── package.json
├── package-lock.json
└── tsconfig.json

MyTools Setup
Created the folder mytools.
Initialized the module:

> npm init -y
> tsc --init

Updated tsconfig.json:

"declaration": true,
"declarationMap": true

Created mytools.ts:

export class MyTools {
    // Class implementation
}

Transpiled TypeScript to JavaScript:

> tsc

Linked the module globally:

> npm link

MyApp Setup
Created the folder myapp

Initialized the app:

> npm init -y
> tsc --init

Linked mytools to myapp:

> npm link mytools

This added mytools to node_modules as expected.

Created myapp.ts and imported MyTools:

import { MyTools } from "mytools";

Problem

Cannot find module 'mytools' or its corresponding type declarations.ts(2307)

Additional Information
Both MyApp and MyTools have their tsconfig.json files configured to handle TypeScript.
The node_modules directory in MyApp correctly includes mytools.
I’ve tried several solutions, but the error persists.
What am I missing or doing wrong?