options.json

{
	"additionalProperties": true,
	"properties": {
	  "publicPath": {
		"anyOf": [
		  {
			"type": "string"
		  },
		  {
			"instanceof": "Function"
		  }
		]
	  }
	},
	"errorMessages": {
	  "publicPath": "should be {String} or {Function} (https://github.com/webpack-contrib/mini-css-extract-plugin#publicpath)"
	},
	"type": "object"
  }