migrate to esm structure

addon/lib/promises.js

@@ -1,14 +1,14 @@
 /**
  * Delay promise
  */
-async function delay(duration) {
+export async function delay(duration) {
   return new Promise((resolve) => setTimeout(resolve, duration));
 }
 
 /**
  * Timeout promise after a set time in ms
  */
-async function timeout(timeoutMs, promise, message = 'Timed out') {
+export async function timeout(timeoutMs, promise, message = 'Timed out') {
   return Promise.race([
     promise,
     new Promise(function (resolve, reject) {
@@ -18,5 +18,3 @@ async function timeout(timeoutMs, promise, message = 'Timed out') {
     })
   ]);
 }
-
-module.exports = { delay, timeout };