Building a Runtime with QuickJS

This article details the process of creating a minimal JavaScript runtime using the QuickJS engine. It explains the difference between a JavaScript engine and a runtime, then walks through booting QuickJS from a custom executable, adding global APIs like console.log, process.uptime(), setTimeout, clearTimeout, and both synchronous and asynchronous file I/O (fs.readFileSync, fs.readFile). The author also discusses implementing an event loop and worker pool for file I/O, providing code examples in C and JavaScript. This is a technical tutorial focused on low-level runtime development, embedding QuickJS, and extending JavaScript environments.