Extension.js Development CLI

extension-develop is a command-line interface (CLI) tool for developing, building, previewing, and packaging cross-browser extensions built with Extension.js. It supports Manifest V3 (MV3) projects for both Chromium and Firefox environments, providing essential development features like a dev server with live/hot-reloading, watch mode, and a robust build system. The current stable version is 3.13.5, with frequent patch and minor releases, often multiple times a week, indicating active development. A key differentiator is its recent programmatic accessibility, allowing developers to integrate its build and preview capabilities, along with an event-driven API (BuildEmitter), directly into larger JavaScript/TypeScript applications, moving beyond solely CLI usage. It includes features for content scripts, background scripts, and managing the entire extension lifecycle.