Tachyon is a production-grade serverless image resizing service built on AWS Lambda and S3. It takes HTTP requests that specify a path to an S3 object and query parameters (width, height, crop, quality, format, etc.), fetches the original image from S3 using the AWS SDK v3, resizes/transcodes it in-memory using the Sharp library (with support for animated GIF/WebP/PNG and smart cropping via smartcrop-sharp), and streams the result back to the client with appropriate cache headers. It natively supports presigned S3 URLs for accessing private objects by implementing a custom request signer that re-attaches presigned query parameters to the S3 GetObject call—bypassing the default SDK signing. The function is designed to be deployed as a single Lambda behind a Function URL (response streaming) or API Gateway, and includes a local development server for testing. While its primary use case is WordPress media handling (as part of the Human Made ecosystem), the core resizing and S3-fetching logic is framework-agnostic and could be adapted to any serverless image processing pipeline.

The Network Media Library plugin for WordPress Multisite provides a central media library shared across all sites in the network. It achieves this by designating one site as the central media library and temporarily switching the context to that site during media operations (upload, insertion, editing, etc.). The plugin hooks into numerous WordPress actions and filters to intercept media-related requests and redirect them to the central site. It also includes compatibility layers for popular third-party plugins like Advanced Custom Fields and MultilingualPress to ensure they work correctly with the shared media library. The code is organized into a single main file with several classes encapsulating specific functionalities, such as managing context switches, preserving post thumbnail IDs during save operations, and handling ACF field rendering.