Systems we build, technologies we explore, and concepts we think about.
A SIGSEGV in production gives you a wall of hex addresses, mangled C++ symbols, and three threads pointing fingers at each other. This post — the series finale — takes…
React Native now offers three ways to build native modules: TurboModules with codegen and type safety, pure JSI HostObjects with full control, and pure C++ with no JSI at all.…
AsyncStorage serializes every read through the bridge. MMKV delivers sub-millisecond key-value access by memory-mapping a file directly into your process. This post builds that engine from scratch — a JSI…
You've learned JSI functions, memory ownership, and threading. Now use all of them simultaneously — under constraints that make normal programming rules illegal. This post builds a production-grade real-time audio…
Every JSI call so far has blocked the JavaScript thread until it returned. That works for `nativeAdd(1, 2)` — but not for compressing an image, querying a database, or encoding…
You've written C++ that talks to JavaScript. It works in your head, it compiles in isolation — but React Native runs on iOS and Android, and those platforms don't speak…
Your HostObject works. JavaScript calls methods, reads properties, the destructor cleans up. But who actually owns the bytes flowing between JavaScript and C++? When JavaScript passes a buffer to native…
A JSI host function is a one-shot tool — call it, get a result, done. But what if you want a native object that JavaScript can hold, inspect, and call…
A JSI function is a C++ lambda disguised as a JavaScript function. No serialization, no bridge, no codegen — just a C++ callable that the runtime invokes directly. This post…
You don't need to learn all of C++ to write JSI native modules. You need five concepts: stack vs heap, references and pointers, RAII, smart pointers, and lambdas. This post…