MagicMirror/modules/default/weatherforecast/node_helper.js

const NodeHelper = require("node_helper");
const Log = require("logger");

module.exports = NodeHelper.create({
	// Override start method.
	start: function () {
		Log.warn(`The module '${this.name}' is deprecated in favor of the 'weather'-module, please refer to the documentation for a migration path`);
	}
});