Started fixing ReactNative app

ReactNativeClient/lib/promise-utils.js

@@ -0,0 +1,37 @@
+function promiseChain(chain, defaultValue = null) {
+	let output = new Promise((resolve, reject) => { resolve(defaultValue); });
+	for (let i = 0; i < chain.length; i++) {
+		let f = chain[i];
+		output = output.then(f);
+	}
+	return output;
+}
+
+function promiseWhile(callback) {
+	let isDone = false;
+
+	function done() {
+		isDone = true;
+	}
+
+	let iterationDone = false;
+	let p = callback(done).then(() => {
+		iterationDone = true;
+	});
+
+	let iid = setInterval(() => {
+		if (iterationDone) {
+			if (isDone) {
+				clearInterval(iid);
+				return;
+			}
+
+			iterationDone = false;
+			callback(done).then(() => {
+				iterationDone = true;
+			});
+		}
+	}, 100);
+}
+
+export { promiseChain, promiseWhile }