1{
2  "extends": "../tsconfig.json",
3  "compilerOptions": {
4    "outDir": "../out-tsc/app",
5    "module": "es6",
6    "baseUrl": "",
7    "types": ["node"] --> ADD THIS
8  },
9  "exclude": [
10    "test.ts",
11    "**/*.spec.ts"
12  ]
13}

1 in tsconfig file which should be:
2"module": "commonjs"
3