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React Academy · Lesson

Loading WASM Modules in React

Dynamically import and instantiate a WASM module inside useEffect and expose its functions to React components.

Standard WASM Loading API

The browser-standard way to load a WASM module is WebAssembly.instantiateStreaming(fetch(url), importObject). This streams the WASM binary as it downloads, begins compilation immediately, and resolves with an object containing the module and the instance. It is the most efficient loading method for production use.

Dynamic Import with WASM Files

Bundlers like Vite and webpack support importing WASM files as ES modules with dynamic import syntax: import('./module.wasm'). The bundler handles the loading mechanics. This approach integrates naturally with code-splitting — the WASM module is loaded only when the importing code runs.

All lessons in this course

  1. What Is WebAssembly and Where React Fits
  2. Loading WASM Modules in React
  3. Rust to WASM with wasm-pack and React
  4. WASM Use Cases: Image Processing and Computation
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