lib/index.js: awaitEmit - first rought implementation

lib/index.js

@@ -157,7 +157,23 @@ function phantomas(url, opts) {
 			loader.loadModules(scope);
 
 			// browser's scope and modules are set up, you can now use it in your modules
-			events.emit('init', browser, page);
+			//events.emit('init', browser, page);
+
+			// TODO: introduce awaitEmit
+			var eventPromises = [];
+
+			events.listeners('init').forEach(async fn => {
+				// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/AsyncFunction
+				const ret = fn(browser, page);
+
+				if (ret instanceof Promise) {
+					eventPromises.push(ret);
+				}
+
+				// console.log(fn, fn.toString(), ret, ret instanceof Promise);
+			});
+
+			await Promise.all(eventPromises);
 
 			// https://github.com/GoogleChrome/puppeteer/blob/v1.11.0/docs/api.md#pagegotourl-options
 			const waitUntil = options['wait-for-network-idle'] ? 'networkidle0' : undefined,