src/generators/shared/utils/getIntro.js/getIifeIntro
function getIifeIntro ( options, imports ) {
	if ( !options.name ) {
		throw new Error( `Missing required 'name' option for IIFE export` );
	}

	return `var ${options.name} = (function (${paramString( imports )}) { 'use strict';\n\n`;
}