Visual Code Snippet for Drupal's Immediately Invoked Function Expression (IFFE). Add to your JS snippets configuration in VS and call it with `drif`.

drupal-js-iffe.vscode.snippet

"Drupal IFFE": {
	"prefix": "drif",
	"body": [
		"/**",
		"* @name ${1:ScriptName}",
		"* @description ${2:Script description.}",
		"* @param {string} input",
		"* @returns {string} output",
		"*/",
		"(function ($, window, Drupal) {",
		"    Drupal.behaviors.blockSettingsSummary = {",
		"        attach: function attach() {",
		"            ${3}",
		"        }",
		"    };",
		"})(jQuery, window, Drupal);"
	],
	"description": "Drupal's recommended Immediate Invoked Function Expression. Source: https://drupalize.me/tutorial/wrap-your-custom-javascript-closure?p=2512."
}