Initial implementation

.npmignore

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+.vscode
+node_modules
+**/*.ts
+tsconfig.json
+tslint.json

index.ts

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+const es6Promisify = require('es6-promisify');
+
+/**
+ * Return a promise that resolves once the given event emitter emits the specified event
+ *
+ * @param {NodeJS.EventEmitter} emitter - The event emitter to watch
+ * @param {string} event - The event to watch
+ * @returns {Promise<{}>} - The promise that resolves once the given emitter emits the specified evnet
+ */
+export function once(emitter: NodeJS.EventEmitter, event: string) {
+  return new Promise((resolve) => {
+    emitter.once(event, result => {
+      resolve(result);
+    });
+  });
+}
+
+/**
+ * Transform callback-based function -- func(arg1, arg2 .. argN, callback) -- into
+ * an ES6-compatible Promise. Promisify provides a default callback of the form (error, result)
+ * and rejects when `error` is truthy. You can also supply settings object as the second argument.
+ *
+ * @param {function} original - The function to promisify
+ * @param {object} [settings] - Settings object
+ * @param {object} settings.thisArg - A `this` context to use. If not set, assume `settings` _is_ `thisArg`
+ * @param {bool} settings.multiArgs - Should multiple arguments be returned as an array?
+ * @returns {function} A promisified version of `original`
+ */
+export function promisify(original: Function, settings?: Object): Function {
+  return es6Promisify(original, settings);
+};

package.json

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+{
+  "name": "mysah",
+  "version": "0.1.0",
+  "description": "ES6 Promise utility belt",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [
+    "ES6",
+    "Promise",
+    "utility"
+  ],
+  "author": "Sami Turcotte",
+  "license": "MIT",
+  "devDependencies": {
+    "@types/node": "^7.0.8"
+  },
+  "dependencies": {
+    "es6-promisify": "^5.0.0"
+  }
+}