# hello-rust
**Repository Path**: mirrors_dsyer/hello-rust
## Basic Information
- **Project Name**: hello-rust
- **Description**: No description available
- **Primary Language**: Unknown
- **License**: MIT
- **Default Branch**: main
- **Homepage**: None
- **GVP Project**: No
## Statistics
- **Stars**: 0
- **Forks**: 0
- **Created**: 2022-04-13
- **Last Updated**: 2026-03-28
## Categories & Tags
**Categories**: Uncategorized
**Tags**: None
## README
Broadly following this useful [tutorial](https://rustwasm.github.io/book/game-of-life/setup.html), which details all the prerequiistes. Attempt to build it (expect some warnings as well):
```
$ wasm-pack build --target web
...
warning: function is never used: `set_panic_hook`
--> src/utils.rs:1:8
|
1 | pub fn set_panic_hook() {
| ^^^^^^^^^^^^^^
|
= note: `#[warn(dead_code)]` on by default
warning: `hello-rust` (lib) generated 1 warning
Finished release [optimized] target(s) in 12.57s
[INFO]: Installing wasm-bindgen...
[INFO]: Optional fields missing from Cargo.toml: 'description', 'repository', and 'license'. These are not necessary, but recommended
[INFO]: :-) Done in 16.03s
[INFO]: :-) Your wasm pkg is ready to publish at /home/dsyer/dev/scratch/hello-rust/pkg.
[WARN]: :-) [60] SSL peer certificate or SSH remote key was not OK (SSL certificate problem: unable to get local issuer certificate)
```
> NOTE: to use the `nix-shell` with the `shell.nix` from this repo you will need to switch off wasm optimization in `Cargo.toml` (per the instructions from the build error):
>
> [package.metadata.wasm-pack.profile.release]
> wasm-opt = false
The JavaScript is so trivial we could embed it directly in the `index.html`:
```html
Hello
```
For Node.js we need a wrapper (`bundle.js`) that defines some shims for the browser:
```javascript
globalThis.alert = (...args) => {
console.log(...args);
}
import init, { greet } from "./hello_rust.js";
const bytes = fs.readFileSync(path.dirname(import.meta.url).replace('file://', '') + '/hello_rust_bg.wasm');
let wasm = await init(bytes);
export { wasm, greet };
export default greet;
```
Run it after building the Spring Boot project so that the static resources are copied over to `./target`:
```javascript
$ node
Welcome to Node.js v16.14.2.
Type ".help" for more information.
> var {greet} = await import('./target/classes/static/bundle.js')
> greet()
Hello, hello-rust!
```