jordaaash · August 31, 2017 18:57 · Aug 31, 2017 · Aug 31, 2017
diff --git a/fiber.js b/fiber.js
@@ -14,6 +14,7 @@ const fiber = function <T: any> (callback: () => T): Promise<T> {
             try {
                 value = callback(function next (): void {
                     if (yielded) {
+                        yielded = false;
                         fiber.run();
                     }
                     else {

diff --git a/fiber.js b/fiber.js
@@ -0,0 +1,42 @@
+/* @flow */
+'use strict';
+
+const Promise = require('bluebird');
+const Fiber   = require('fibers');
+
+const fiber = function <T: any> (callback: () => T): Promise<T> {
+    return new Promise(function (resolve: Function, reject: Function): void {
+        Fiber(function (): void {
+            let fiber: Fiber     = Fiber.current;
+            let yielded: boolean = false;
+
+            let value: T;
+            try {
+                value = callback(function next (): void {
+                    if (yielded) {
+                        fiber.run();
+                    }
+                    else {
+                        yielded = true;
+                        Fiber.yield();
+                    }
+                });
+
+                if (yielded) {
+                    resolve(value);
+                }
+                else {
+                    throw new Error('fiber not yielded');
+                }
+            }
+            catch (error) {
+                reject(error);
+            }
+            finally {
+                fiber = null;
+            }
+        }).run();
+    });
+};
+
+module.exports = fiber;