how to do linting using nodemon?

Question

Can I use nodemon to lint my javascript? I am not using any build tool e.g. gulp or grunt and want to maximize the use of node and npm.

The output from nodemon can be piped. I want to use this for linting the changed file using eslint.

Here is my package.json

{
  "name": "app",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "start": "nodemon server.js",
    "lint": "eslint"
  },
  "dependencies": {
    "MD5": "*",
    "clean-css": "*",
    "express": "~4.9.0",
    "express-handlebars": "~2.0.1",
    "express-redis-cache": "*",
    "foundation-sites": "~5.5.3",
    "fs-extra": "~0.8.1",
    "node-rest-client": "~1.5.1",
    "node-sass": "*",
    "path": "*"
  },
  "devDependencies": {
    "babel-eslint": "^4.1.6",
    "eslint": "^1.10.3",
    "eslint-config-airbnb": "^2.1.1",
    "eslint-config-airbnb-es5": "^1.0.8",
    "eslint-plugin-react": "^3.13.1",
    "nodemon": "~1.8.1",
    "parallelshell": "~2.0.0",
    "watch": "~0.17.1"
  }
}

I tried this. But it doesn't work.It gives error.

       "scripts": {
    "start": "nodemon({ script: 'server.js' }).on('restart', function () {console.log('nodemon started');}).on('crash', function () {console.log('script crashed for some reason');});",
    "lint": "eslint"
  },

Answer 1

You can use the exec option of nodemon to run your tests as you save code. Here's an example:

nodemon server.js --exec 'npm run test && node'

This will cause nodemon to run npm run test && node server.js, and it won't start the server until all the tests have run successfully.

Answer 2

I use Standard.js for linting and I can get it to work with nodemon using the below package.json script.

"scripts": {
  "lint": "standard",
  "dev": "nodemon ./app --exec \"npm run lint && node\""
  "start": "nodemon ./app"
}

When I run npm run dev, any changes I make will be monitored and linted. I tested this in Windows using PowerShell.