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most basic working helloworldish example

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Scott Richmond 2024-11-24 22:49:22 -05:00
commit 8d39036c53
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124
Cargo.lock generated Normal file
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 4
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15
Cargo.toml Normal file
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[package]
name = "rustwasm"
version = "0.1.0"
edition = "2021"
[dependencies]
wasm-bindgen = "0.2"
# this is necessary to build the wasm blob
[lib]
crate-type = ["cdylib"]
# suppress the lint warning for the #[wasm_bindgen] directive in lib.rs
[lints.rust]
unexpected_cfgs = { level = "warn", check-cfg = ['wasm_bindgen']}

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build:
wasm-pack build --target web --out-dir web/dist

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src/lib.rs Normal file
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use wasm_bindgen::prelude::*;
// the js file must be in the RUST project
// it gets bundled
#[wasm_bindgen(module = "/things.js")]
extern "C" {
fn foo() -> String;
}
#[wasm_bindgen]
extern "C" {
fn alert(s: String);
}
// without the line in Cargo.toml, this throws a lint warning
#[wasm_bindgen]
pub fn greet() {
let from_js = foo();
alert(format!("Hello, {from_js}"));
}

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things.js Normal file
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export function foo () {return "bar"}

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web/index.html Normal file
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<!doctype html>
<html>
<head>
<meta charset = "utf-8" />
<title>Rust + Wasm Minimal Setup</title>
</head>
<body>
<script type = "module" src = "./index.js"></script>
</body>
</html>

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web/index.js Normal file
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import init, * as wasm from "./dist/rustwasm.js"
await init()
wasm.greet()