Transpiling ES6 to ES5 using babel

I have a package.json file configured to grab all js files from a directory and merge them into a new file, doing transpiling to ES5. However, it is just creating a new file and unifying all the js files from the specified directory. It is not converting to ES5. I do not know what's missing in the package.json file, if you can help me. Here is the code:

{
  "name": "farmafam",
  "version": "1.0.0",
  "description": "",
  "babel": {
    "presets": ["es2015"]
  },
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "babel": "babel ../js/modulos/js-es6 --watch --out-file ../js/modulos/modulos.js"
  },
  "author": "KM2",
  "license": "ISC",
  "devDependencies": {
    "babel-cli": "^6.14.0",
    "babel-preset-es2015": "^6.14.0"
  }
}