fix(lib): add callback array to nwbuild function

Author: ayushmanchhabra

README.md

@@ -62,6 +62,12 @@ nwbuild({
 
 > Stay up to date via the [Changelog](https://github.com/nwjs-community/nw-builder/blob/master/.github/CHANGELOG.md).
 
+### Methods
+
+#### nwbuild(options, callbacks)
+
+The function that setups up, runs and builds your NW.js applications. The `callbacks` are for the `run` and `build` function that run inside the `nwbuild` function. The callbacks `callback[0]`, `callback[1]`, `callback[2]` correspond to the `.then`, `.catch` and `.finally` functions of the `run` or `build` promise.
+
 ### Options
 
 #### options.mode

lib/index.cjs

@@ -1084,7 +1084,7 @@ NwBuilder.prototype.preparePlatformFiles = function (
   return true;
 };
 
-const nwbuild = (options) => {
+const nwbuild = (options, callback = [() => {}, () => {}, () => {}]) => {
   const nw = new NwBuilder(options);
 
   nw.on("log", (msg) => {
@@ -1093,14 +1093,14 @@ const nwbuild = (options) => {
 
   if (nw.options.mode === "run") {
     nw.run()
-      .then(() => {})
-      .catch(() => {})
-      .finally(() => {});
+      .then(callback[0])
+      .catch(callback[1])
+      .finally(callback[2]);
   } else if (nw.options.mode === "build") {
     nw.build()
-      .then(() => {})
-      .catch(() => {})
-      .finally(() => {});
+    .then(callback[0])
+    .catch(callback[1])
+    .finally(callback[2]);
   } else {
     console.log("[ WARN ] Invalid mode option.");
   }