Rust から WebAssembly にコンパイルする　のチュートリアルを行いました

$ rustc -V
rustc 1.59.0 (9d1b2106e 2022-02-23)

# Rustのビルドツールおよびパッケージ管理ツール
$ cargo --version
cargo 1.59.0 (49d8809dc 2022-02-10)

# 管理ツール
$ rustup -V
rustup 1.24.3 (ce5817a94 2021-05-31)
info: This is the version for the rustup toolchain manager, not the rustc compiler.
info: The currently active `rustc` version is `rustc 1.59.0 (9d1b2106e 2022-02-23)`

# 有効なツールチェインの確認
$ rustup show
Default host: x86_64-unknown-linux-gnu
rustup home:  /home/ariki/.rustup

installed targets for active toolchain
--------------------------------------

wasm32-unknown-unknown
x86_64-unknown-linux-gnu

active toolchain
----------------

stable-x86_64-unknown-linux-gnu (default)
rustc 1.59.0 (9d1b2106e 2022-02-23)

cargo install wasm-pack

$ cargo new --lib hello-wasm
     Created library `hello-wasm` project

use wasm_bindgen::prelude::*;

#[wasm_bindgen]
extern {
    pub fn alert(s: &str);
}

#[wasm_bindgen]
pub fn greet(name: &str) {
    alert(&format!("Hello, {}!", name));
}

[package]
name = "hello-wasm"
version = "0.1.0"
authors = ["Your Name <you@example.com>"]
description = "A sample project with wasm-pack"
license = "MIT/Apache-2.0"
repository = "https://github.com/yourgithubusername/hello-wasm"
edition = "2018"

[lib]
crate-type = ["cdylib"]

[dependencies]
wasm-bindgen = "0.2"

wasm-pack build --target web

$ python3 -m http.server