Code Examples for Angular Budget Configuration and Reduction Techniques

• Angular Budgets: Angular provides a feature called "budgets" that helps you manage the size of your application's generated bundles. This is crucial because large bundles can lead to slow loading times for your users.
• Production Build: When you run ng build --prod (or a similar command), Angular optimizes your code for production deployment. This optimization process can involve minification, tree-shaking (removing unused code), and other techniques.
• Budget Threshold Exceeded: The warning indicates that the initial bundle (the main JavaScript file loaded by your app) has exceeded the maximum size limit you've configured in your project's settings. This means your app might be larger than intended, potentially impacting user experience.

Resolving the Warning:

There are two main approaches to address this warning:

1. Increase Budget Limit (Not Recommended):

2. Reduce Bundle Size (Recommended):

Choosing the Right Approach:

The best course of action depends on your specific project requirements:

• If you have a strict performance budget and user experience is a top priority, focus on reducing your bundle size using the techniques mentioned above.
• If you have a valid reason for a larger initial bundle (e.g., integrating a complex third-party library), you could carefully consider increasing the budget limit while keeping a close eye on bundle sizes in future development. However, prioritize optimization whenever possible.

Code Examples for Angular Budget Configuration and Reduction Techniques

{
  "architect": {
    "build": {
      "configurations": {
        "production": {
          "budgets": [
            {
              "type": "initial",
              "maximumWarning": "3mb" // Adjust this value cautiously if needed
            }
          ]
        }
      }
    }
  }
}

Code Splitting with Lazy Loading (Recommended):

a. Lazy Loading Module (lazy-loaded.module.ts):

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { LazyLoadedComponent } from './lazy-loaded.component';

const routes: Routes = [
  { path: 'lazy-loaded', component: LazyLoadedComponent }
];

@NgModule({
  declarations: [LazyLoadedComponent],
  imports: [RouterModule.forChild(routes)],
  exports: [RouterModule]
})
export class LazyLoadedModule { }

b. App Routing Module (app-routing.module.ts):

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { HomeComponent } from './home.component';
import { LazyLoadedModule } from './lazy-loaded/lazy-loaded.module';

const routes: Routes = [
  { path: '', component: HomeComponent },
  { path: 'lazy-loaded', loadChildren: () => import('./lazy-loaded/lazy-loaded.module').then(m => m.LazyLoadedModule) }
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

Third-Party Library Analysis (Using ng serve Flag):

ng serve --configuration=vendor

• By default, Angular uses Just-in-Time (JIT) compilation, which compiles your code during runtime.
• AOT compilation pre-compiles your application into machine code during the build process. This can improve performance and potentially reduce bundle size by eliminating unused features from the compilation process.
• To enable AOT, use the --aot flag with ng build --prod --aot.

Ivy Rendering Engine (Angular 8+):

• Introduced in Angular 8, Ivy is the new default rendering engine. It offers several benefits, including:
  • Smaller bundle sizes by using a more efficient tree-shaking algorithm.
  • Improved performance through better code generation and optimizations.
• If you're using an older Angular version (pre-8), consider upgrading to take advantage of Ivy.

Build Analyzer Tools:

• Tools like webpack-bundle-analyzer can help you visualize the composition of your bundles and identify areas for potential optimization.
• Integrate these tools into your build process to gain insights into what's contributing to bundle size and prioritize your optimization efforts.

Font Optimization:

• While code splitting and tree-shaking are crucial, consider font optimization techniques:
  • Use web font services that provide optimized font subsets containing only the necessary characters and styles.
  • Explore icon fonts or SVGs as alternatives to traditional web fonts for simple icons.

• Similar to fonts, optimize images used in your app:
  • Use tools like imagemin to compress images with minimal quality loss.
  • Consider responsive images to adapt image sizes based on user devices.

Remember:

• While there might be a temptation to increase budget limits, it's generally recommended to prioritize code optimization techniques for a faster and more user-friendly application.
• The most effective approach often involves a combination of these methods tailored to your specific project and dependencies.