Programming Tutorials

  Few production incidents are as frustrating as a silent failure in Over-The-Air (OTA) updates. Your CI/CD pipeline reports a successful deployment via   eas update . The bundle uploads to the Expo cloud. Yet, end-users report that bugs remain fixed, or worse, the application crashes immediately upon receiving the update. In 90% of these cases, the culprit is not bad JavaScript code. It is a misalignment between the  Runtime Version  of the native binary installed on the device and the target runtime version of the OTA update. This guide provides a rigorous technical breakdown of why this mismatch occurs, how the Expo Updates protocol evaluates compatibility, and how to implement a fail-safe configuration in your  app.config.ts  and CI/CD pipelines. The Anatomy of a Mismatch To solve the problem, we must first understand the mechanism of failure. When an Expo app launches, the  expo-updates  native module performs a handshake with the update serv...

  You have optimized your Rust logic, compiled to   wasm32-unknown-unknown   with   atomics   enabled, and implemented parallelization using Rayon. Yet, when you load the application in Chrome or Firefox, the WebAssembly module fails to instantiate, or the main thread panics with a specific, cryptic runtime error: Uncaught ReferenceError: SharedArrayBuffer is not defined This is not a Rust compilation error. It is a browser security enforcement. By default, modern browsers disable the  SharedArrayBuffer  constructor—the primitive required for WebAssembly threads to share memory—unless the context is "Cross-Origin Isolated." To unlock multithreading in the browser, you must explicitly configure the  Cross-Origin Opener Policy (COOP)  and  Cross-Origin Embedder Policy (COEP)  headers on your server. The Root Cause: Spectre and Side-Channels The disabling of  SharedArrayBuffer  is a direct mitigation against  Spectre ...