nyc code coverage not working for NodeJs express server

Question

I have a NodeJs express server named app.js, I want to do a code coverage using nyc.

// app.js
const express = require('express')
const app = express()
const port = 3000

app.get('/', (req, res) => {
  res.send({
    message: 'Hello World!'
  })
})

app.listen(port, () => {
  console.log(`Example app listening on port ${port}`)
})

//.nycrc.json
{
  "all": true,
  "cache": false,
  "check-coverage": true,
  "sourceMap": false,
  "instrument": false,
  "cmd": "./",
  "temp-dir": "./.nyc_output",
  "include": [
    "e2e-app/src/**/*.ts",
    "server/app.js"
  ],
  "exclude": [
    "e2e-app/src/**/*.spec.ts"
  ],
  "report-dir": "./coverage-e2e",
  "reporter": [
    "lcov",
    "text",
    "text-summary",
    "cobertura"
  ],
  "branches": 80,
  "lines": 80,
  "functions": 80,
  "statements": 80,
  "watermarks": {
    "statements": [
      70,
      100
    ],
    "branches": [
      70,
      100
    ],
    "functions": [
      70,
      100
    ],
    "lines": [
      70,
      100
    ]
  }
}

1. In terminal I do nyc node server/app.js
2. In my browser, I go to http://localhost:3000, I see the Hello World! printed on my screen.
3. I see there is a folder .nyc_output created with a json file, but the json's content is just an empty object.
4. I kill NodeJs process, and run nyc report, I got an empty report.

What did I do wrong here?

Answer 1

The solution is do this node node_module/nyc/bin/nyc npm start