Angular and Node.js DEBUG Decorator

Introduction

You can apply @Debug() decorator on your Angular and Node.js application methods to mark them to be executed in debug mode only.

For Angular when you build application for production using ng build --prod command, all methods marked with @Debug() decorator will not be exeucted in production mode.

So no more if(environment.production){} code block in your source code.

Angular client usage

• Install ng-debug-decorator npm package by running below command in your Angular application

npm i --save-dev ng-debug-decorator

• Provide environment information to decorator configuration by calling @SetupEnvironment() function in app.component.ts ngOnInit() function. This has to be done only once.

import { environment } from 'src/environments/environment';
import { SetupEnvironment, Debug } from 'ng-debug-decorator';

  @SetupEnvironment(environment)
  ngOnInit() {
    this.sayHi();
  }

  @Debug()
  sayHi() {
    alert('I am debug code');
  }

• Apply @Debug() decorator on method(s)

• Build application in development mode by running command ng build.  

• Navigate to dist folder and run website using any web server e.g. lite-server.

You should see method being executed with @Debug() decorator

• Now, build applicatiojs using ng build --prod command

• Navigate to dist folder and run website using any web server e.g. lite-server.

Now you should NOT see output of method(s) on which @Debug() decorator is applied.

Here is the Angular client example repository.

Node.js client usage

• Install ng-debug-decorator npm package by running below command in your Nod.ejs application

npm i --save-dev ng-debug-decorator

• Import Debug function from ng-debug-decorator package

import { Debug } from "ng-debug-decorator";

• Apply @Debug() decorator on class method's

• Update package.json for specifying environment settings

"scripts": {
   "start": "NODE_ENV=development node ."
}

• Run application by executing command npm run start.

If you are in production environment then all methods with @Debug() method won't get executed at runtime.