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# Hello, World! [View full source code][code] or [view the compiled example online][online] [online]: https://rustwasm.github.io/wasm-bindgen/exbuild/hello_world/ [code]: https://github.com/rustwasm/wasm-bindgen/tree/master/examples/hello_world 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. ```toml {{#include ../../../examples/hello_world/Cargo.toml}} ``` ## `src/lib.rs` Here we define our Rust entry point along with calling the `alert` function. ```rust {{#include ../../../examples/hello_world/src/lib.rs}} ``` ## `index.js` Our JS entry point is quite small! ```js {{#include ../../../examples/hello_world/index.js}} ``` ## Webpack-specific files > **Note**: Webpack is required for this example, and if you're interested > in options that don't use a JS bundler [see other examples][wab]. [wab]: without-a-bundler.html And finally here's the Webpack configuration and `package.json` for this project: **webpack.config.js** ```js {{#include ../../../examples/hello_world/webpack.config.js}} ``` **package.json** ```json {{#include ../../../examples/hello_world/package.json}} ```
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