nyc mocha is showing unknown(0%) code coverage with typescript module.

[RajMarutitech]

I have all the files are with .ts extension. My package.json file looks like

  "name": "temp-node",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "type": "module",
  "scripts": {
    "build": "tsc",
    "start": "node dist/src/index.js",
    "test": "nyc mocha --require ts-node/register dist/test-test/add.test.js"

  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@types/node": "^20.5.7",
    "chai": "^4.3.8",
    "mocha": "^10.2.0",
    "nyc": "^15.1.0",
    "sinon": "^15.2.0",
    "ts-node": "^10.9.1",
    "typescript": "^5.2.2"
  },
  "nyc": {
    "extends": "@istanbuljs/nyc-config-typescript",
    "check-coverage": true,
    "all": true,
    "include": [
        "src-test/**/*.ts"
    ],
    "exclude": [
        "test-test/**/*.ts"
    ],
    "reporter": [
        "html",
        "lcov",
        "text",
        "text-summary"
    ],
    "report-dir": "coverage"
  }
}

And the tsconfig file is:

{
    "compilerOptions": {
        "module": "NodeNext",
        "moduleResolution": "NodeNext",
        "esModuleInterop": true,
        "target": "ESNext",
        "sourceMap": true,
        "outDir": "dist",
        "rootDirs": ["src-test", "test-test"],
        "baseUrl": "src-test",
        "paths": {
            "*": ["src-test/*"]
        }
    },
    "include": [
        "src-test/**/*",
        "test-test/*"
    ],
    "exclude": [
        "node_modules",
        "dist"
    ]
}

Test file looks like:

// test/test_math.js
import { add, subtract } from '../src-test/math.js'
import { multiply, divide } from '../src-test/utils/util.js'
import { expect } from 'chai';
import { describe, it } from 'node:test';


describe('Math operations', () => {
  it('should add two numbers', () => {
    expect(add(2, 3)).to.equal(5);
  });

  it('should subtract two numbers', () => {
    expect(subtract(5, 3)).to.equal(2);
  });

  it('should multiply two numbers', () => {
    expect(multiply(2, 3)).to.equal(6);
  });

  it('should divide two numbers', () => {
    expect(divide(6, 3)).to.equal(2);
  });
});

Now when I run npm test, it is showing output as

Statements   : 0% ( 0/8 )
Branches     : 100% ( 0/0 )
Functions    : 0% ( 0/4 )
Lines        : 0% ( 0/8 )

I think I might misconfigured the tsconfig or it is the issue with NYC that it is not working like this with typescript and any other configuration is needed to run NYC and get the code coverage of the typescript code.

One try was successful:

• I just removed the type:module from package.json file
• remove the extensions(.js) from test files.
• test command is "test": "nyc mocha --require ts-node/register test-test/add.test.ts"
  In this scenario it is working expected and giving 100% code coverage.
  However the code I have given is the dummy code and it is given for better understanding, but in my actual app I can't remove type from the package.json.
  so My expectation is I want some solution with type:module in the package.json.