NgxScriptOptimizer

A lightweight Angular library designed to supercharge your third-party script handling.

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Note:

Supports Angular 15 onwards. Not compatible with versions older than Angular 15.

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Features 🎯

Optimize Your Third-Party Scripts:

Effortlessly improve the performance and management of third-party JavaScript, whether inline or external, while minimizing Total Blocking Time (TBT) and First Contentful Paint (FCP) improving page speed and performance.

Seamless Integration with SSR and CSR:

Designed for both Server-Side Rendering (SSR) and Client-Side Rendering (CSR), ensuring compatibility and flexibility for modern web applications.

Asynchronous and Efficient Loading:

Supports multiple loading strategies:

• Eager: Runs scripts as soon as they are available.
• Lazy: Defer execution until the page is fully loaded.
• Idle: Leverages requestIdleCallback to execute when the main thread is free.
• Worker: Runs scripts in a Web Worker for non-blocking execution.

Customizable Script Placement:

Choose where scripts are appended (head or body), giving you full control over your HTML structure. Call scripts exclusively on a page to page basis or globally based on your need. The scripts are automatically removed from the DOM once the page is destroyed.

Lightning Fast & Lightweight:

Minimal impact on your bundle size with a developer-friendly API that focuses on speed and simplicity.

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Who Benefits from NgxScriptOptimizer?

Industries That Rely Heavily on Third-Party Scripts:

1. E-Commerce: Enhance loading speed for analytics, payment gateways, and dynamic content.
2. Media & Publishing: Optimize ads, comments plugins, and embedded videos.
3. SaaS Platforms: Load tracking tools and third-party SDKs efficiently.
4. Finance: Ensure secure and performant integrations of banking APIs and fraud detection tools.
5. Education: Optimize learning platforms with third-party integrations like video conferencing or quiz tools.

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Installation

npm install ngx-script-optimizer

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Usage

Basic Example

Import the package and include it in your standalone Angular component:

import { ScriptOptimizerComponent } from 'ngx-script-optimizer';

@Component({
  selector: 'app-root',
  standalone: true,
  imports: [CommonModule, ScriptOptimizerComponent],
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {}

In your HTML:

<ngx-script-optimizer
  src="https://example.com/api.js"
  (onLoad)="runAfterLoad()"
  renderStrategy="client"
  loadStrategy="lazy"
  appendTo="head"
  contentType="text/javascript"
></ngx-script-optimizer>

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Detailed Examples

1. Server-Side Rendering (SSR)

Note: Please note that for SSR, only the lazy and eager loading strategies are available. For CSR all options are available.

For SSR, scripts are rendered and run on the server, becoming part of the initial HTML sent to the browser.

<ngx-script-optimizer
  [scriptContent]="'console.log(\'SSR Script Executed\');'"
  renderStrategy="server"
  loadStrategy="eager"
  appendTo="body"
  contentType="text/javascript"
></ngx-script-optimizer>

2. Client-Side Rendering (CSR)

Lazy Loading Example

Load the script after the page content has finished loading. The lazy load strategy will attach the defer flag to the script tag:

<ngx-script-optimizer
  src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.1/moment.min.js"
  renderStrategy="client"
  loadStrategy="lazy"
  appendTo="head"
  contentType="text/javascript"
  (onLoad)="console.log('Moment.js loaded')"
></ngx-script-optimizer>

Idle Loading Example

Execute the script when the browser's main thread is idle:

<ngx-script-optimizer
  [scriptContent]="'console.log(\'Idle Script Executed\');'"
  renderStrategy="client"
  loadStrategy="idle"
  appendTo="head"
  contentType="text/javascript"
></ngx-script-optimizer>

Web Worker Execution Example

Run a script in a Web Worker:

Note: Please note that only the scriptContent attribute is currently compatible with the web worker option.

<ngx-script-optimizer
  [scriptContent]="`onmessage = function(e) {
    const result = e.data.num1 * e.data.num2;
    postMessage(result);
  };`"
  renderStrategy="client"
  loadStrategy="worker"
  appendTo="body"
  contentType="text/javascript"
></ngx-script-optimizer>

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Options

Input	Value	Description
scriptContent	string	Inline JavaScript code to execute. Cannot be run simultaneoulsy with the src attribute.
src	string	External script URL (not supported in Web Worker mode). Cannot be run simultaneoulsy with the scriptContent attribute.
renderStrategy	server / client	Determines where the script runs (SSR or CSR). Default value is server.
loadStrategy	eager / lazy / idle / worker	Controls when and how the script loads. Default value is lazy.
appendTo	head / body	Specifies where to attach the script in the DOM. Default value is head
contentType	text/javascript	Specifies the MIME type of the script. Default value is text/javascript
(onLoad)	function	Event triggered immediately after the script is executed. Note that the onLoad method cannot be used in conjunction with SSR as it can only be called on the client side.
integrity	string	Optionally provide the script integrity attribute.
origin	string	Optionally provide the script crossorigin attribute.

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Default Values

• Render Strategy: server
• Load Strategy: lazy
• Append To: head
• Content Type: text/javascript

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Contributing

Feel free to contribute to this library! Raise issues, suggest features, or submit pull requests.

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License

This project is licensed under the MIT License.