RNubla / hello-nextjs-wasm

NextJS Rust WASM

Resource

1. Create a react/nextjs app

2. create a rust lib with cargo in the web app folder

   Created library `wasm-lib`package`
   

3. Add the wasm-bidgen dependency in rust

   [package]
   name = "wasm-lib"
   version = "0.1.0"
   edition = "2021"
    +[lib]
    +crate-type = ["cdylib"]
   [dependencies]
   +wasm-bindgen = "0.2.78"
   

4. add wasm-bindgen to your function

   +use wasm_bindgen::prelude::\*;
   +#[wasm_bindgen]
   pub fn add(a: i32, b: i32) -> i32 {
   a + b
   } #[test]
   fn add_test() {
   assert_eq!(1 + 1, add(1, 1));
   }
   

5. on the react root project folder run the following: cargo install wasm-pack

6. add the following to package.json

   "build:wasm": "cd wasm-lib && wasm-pack build --target web --out-dir pkg",
   

7. npm run build:wasm

8. npm install ./wasm-lib/pkg

9. Call the wasm function into the app

   import and call
   import React, { useEffect, useState } from 'react';
   +import init, { add } from "wasm-lib";
   import logo from './logo.svg';
   import './App.css';
   
   function App() {
   
   - const [ans, setAns] = useState(0);
   - useEffect(() => {
   - init().then(() => {
   -      setAns(add(1, 1));
   - })
   - }, [])
   return (
   <div className="App">
       <header className="App-header">
       <img src={logo} className="App-logo" alt="logo" />
       <p>
           Edit <code>src/App.tsx</code> and save to reload.
       </p>
   -        <p>1 + 1 = {ans}</p>
           <a
               className="App-link"
               href="https://reactjs.org"
               target="_blank"
               rel="noopener noreferrer"
           >
               Learn React
           </a>
           </header>
       </div>
   
   );
   }
   
     export default App;