npm and error messages

node_modules/currently-unhandled/core.js

@@ -0,0 +1,33 @@
+'use strict';
+var arrayFindIndex = require('array-find-index');
+
+module.exports = function () {
+	var unhandledRejections = [];
+
+	function onUnhandledRejection(reason, promise) {
+		unhandledRejections.push({reason: reason, promise: promise});
+	}
+
+	function onRejectionHandled(promise) {
+		var index = arrayFindIndex(unhandledRejections, function (x) {
+			return x.promise === promise;
+		});
+
+		unhandledRejections.splice(index, 1);
+	}
+
+	function currentlyUnhandled() {
+		return unhandledRejections.map(function (entry) {
+			return {
+				reason: entry.reason,
+				promise: entry.promise
+			};
+		});
+	}
+
+	return {
+		onUnhandledRejection: onUnhandledRejection,
+		onRejectionHandled: onRejectionHandled,
+		currentlyUnhandled: currentlyUnhandled
+	};
+};