refactor: refactor script and update README.md

Author: Oleksii Zaichko

README.md

@@ -20,3 +20,10 @@ Those commands will autoupdate changelog and dependant package.json's
 
 Unfortunately command `npm publish` is broken due to nature of ng-packager. 
 It's substituted with `npm run publish`, which will correctly build and publish production build
+
+## Webpack shimming
+
+ngx-mqtt depends on mqtt package which uses node globals.
+In order to make it run inside browser it includes a postinstall script which patches Angular webpack config of the project it was imported into.
+To disable this, you have to set `mqtt-disable-hook` environmental variable while installing this package.
+

projects/ngx-mqtt/postinstall.js

@@ -1,9 +1,14 @@
+if (process.env['mqtt-disable-hook']) {
+  return 0;
+}
+
 const fs = require('fs');
 const f = '../../node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/webpack-configs/browser.js';
 
 fs.readFile(f, 'utf8', function (err,data) {
   if (err) {
-    return console.log(err);
+    console.error(err);
+    throw err;
   }
   // at some moment angular-cli tam disabled node polyfills and stubs in webpack
   // from:
@@ -12,6 +17,9 @@ fs.readFile(f, 'utf8', function (err,data) {
   // node: {global: true}
   const result = (data.replace(/node: false/g, "node: {global: true}"));
   fs.writeFile(f, result, 'utf8', function (err) {
-    if (err) return console.log(err);
+    if (err) {
+      console.error(err);
+      throw err;
+    }
   });
 });