zhangyang-zerotierone/zeroidc/vendor/wasm-bindgen/guide/src/examples/hello-world.md

Hello, World!

View full source code or view the compiled example online

This is the "Hello, world!" example of #[wasm_bindgen] showing how to set up a project, export a function to JS, call it from JS, and then call the alert function in Rust.

Cargo.toml

The Cargo.toml lists the wasm-bindgen crate as a dependency.

Also of note is the crate-type = ["cdylib"] which is largely used for wasm final artifacts today.

{{#include ../../../examples/hello_world/Cargo.toml}}

src/lib.rs

Here we define our Rust entry point along with calling the alert function.

{{#include ../../../examples/hello_world/src/lib.rs}}

index.js

Our JS entry point is quite small!

{{#include ../../../examples/hello_world/index.js}}

Webpack-specific files

Note

: Webpack is not required for this example, and if you're interested in options that don't use a JS bundler see other examples.

And finally here's the Webpack configuration and package.json for this project:

webpack.config.js

{{#include ../../../examples/hello_world/webpack.config.js}}

package.json

{{#include ../../../examples/hello_world/package.json}}