Working TypeScript debug example for Visual Studio Code

index.ts

// src/index.ts
import { lubiePlacki } from "./placki";

function printMessage(msg: string): void {
  console.log(`Message: ${msg}`);
}

printMessage("Hello, TypeScript");
debugger;
lubiePlacki();

llaunch.json

// .vscode/launch.json
{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "type": "node",
            "request": "launch",
            "name": "Launch Program",
            "preLaunchTask": "npm: build",
            "skipFiles": [
                "<node_internals>/**"
            ],
            "program": "${workspaceFolder}/dist/index.js"
        }
    ]
}

package.json

{
  "name": "typescript-fun",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "tsc-watch --onSuccess \"node ./dist/index.js\"",
    "build": "tsc",
    "list": "tsc --listFiles",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "tsc-watch": "^2.1.2",
    "typescript": "^3.5.1"
  }
}

placki.ts

// src/placki.ts
export const lubiePlacki = () => {
    console.log("Lubie placki");
}

tsconfig.json

{
    "compilerOptions": {
        "target": "es2018",
        "outDir": "dist",
        "rootDir": "src",
        "module": "commonjs",
        "sourceMap": true
    }
}