How to minify files in asp.net core?

Documentation for asp.net core shows how to do bundling and minification css and js files using grunt or gulp. However when i create a project using vs 2015 it adds bundleconfig.json file into project. I want to minify all the js files inside wwwroot/js folder. So i updated the existing lines inside bundleconfig.json to use wildcard character *

{
    "outputFileName": "wwwroot/js/*.min.js",
    "inputFiles": [
      "wwwroot/js/*.js"
    ],
    // Optionally specify minification options
    "minify": {
      "enabled": true,
      "renameLocals": true
    },
    // Optinally generate .map file
    "sourceMap": false
  }

however when i publish the project i get error

Processing wwwroot/js/*.min.js Illegal characters in path. Parameter name: path

I think you can't have wildcards in outputFileName, so use an absolute path here. To create multiple bundles create multiple entries in the array.

[
  {
    "outputFileName": "wwwroot/css/site.min.css",
    // An array of relative input file paths. Globbing patterns supported
    "inputFiles": [
      "wwwroot/css/site.css"
    ]
  },
  {
    "outputFileName": "wwwroot/js/site.min.js",
    "inputFiles": [
      "wwwroot/js/site.js"
    ],
    // Optionally specify minification options
    "minify": {
      "enabled": true,
      "renameLocals": true
    },
    // Optinally generate .map file
    "sourceMap": false
  }
]

This one above is from the default bundleconfig.json.

On a side note:

*.min.js is also a *.js btw. So if you don't delete the previous one it will be added recursively with each bundling, so be careful.