Netlify ImageEngine Plugin

The Netlify ImageEngine plugin optimizes your images by up to 80% on autopilot, enhancing SEO, reducing bounce rates, improving mobile experiences, and boosting sales.

Installation

Install this plugin from Netlify.

NPM : npm i netlify-plugin-imageengine

example netlify.toml

[[plugins]]
package = "netlify-plugin-imageengine"

  [plugins.inputs]
  deliveryAddress = "blazing-fast-pics.cdn.imgeng.in"

  [plugins.inputs.directives]
  height = 600
  width = 700
  rotate = 90

Configuration

The following inputs options are available:

• deliveryAddress: The ImageEngine delivery address.
• directives: Optional image transformation directives.

Features

Image Optimization

• Automatic URL Replacement: The plugin scans HTML files and replaces image URLs with optimized ImageEngine URLs using the updateHtmlImagesToImageEngine function.

• srcset Handling: It updates srcset attributes to ensure all image sources are optimized, improving loading times and image quality across different devices.

• Error Handling: The plugin logs errors encountered during the URL transformation process, ensuring smooth operation and easy debugging.

Build Process Integration

• Netlify Build Plugin: The onPostBuild function integrates with Netlify's build process, automatically optimizing images after the build completes.

• Environment Context Awareness: The plugin adapts to different Netlify deployment contexts (e.g., branch deploys, deploy previews) by using the appropriate host URL.

• Configuration Validation: It checks for necessary configurations like deliveryAddress and PUBLISH_DIR, failing gracefully with informative error messages if they are missing.

Code Overview

updateHtmlImagesToImageEngine

This function takes HTML content and options, then updates image URLs to use ImageEngine for optimization. It handles both src and srcset attributes, ensuring all images are optimized.

processBundle

This function processes JavaScript bundle content, replacing image URLs with optimized ImageEngine URLs. It uses regular expressions to identify image URLs and applies the transformSrcURL and build_IE_url functions to generate the optimized URLs. This ensures that all images in the JavaScript bundles are optimized for better performance and quality.

transformSrcURL

This function transforms original image URLs to use the ImageEngine delivery address. It handles different types of URLs:

• Remote URLs: Transforms fully-qualified URLs (e.g., starting with "http://" or "https://") and protocol-relative URLs (e.g., starting with "//").
• Local URLs: Transforms local paths to use the ImageEngine delivery address, ensuring all images are served through ImageEngine for optimization.

It ensures that the final URL is correctly formatted and ready for ImageEngine processing.