Chapter 9: Crossing the Boundary between Rust and WebAssembly

So far, we have only seen examples of sharing simple numbers between JavaScript and WebAssembly. In the last section, we saw how wasm-bindgen helps to pass a string from Rust to JavaScript with ease. In this chapter, we will explore how wasm-bindgen makes it easier to convert more complex data types between JavaScript and WebAssembly via Rust. We will cover the following sections in this chapter:

• Sharing classes from Rust with JavaScript
• Sharing classes from JavaScript with Rust
• Calling the JavaScript API via WebAssembly
• Calling closures via WebAssembly
• Importing the JavaScript function into Rust
• Calling a web API via WebAssembly