Helpful resources

This page contains some further information that is helpful when using and/or developing WebAssembly modules.

WebAssembly API

Further information on all parts of the WebAssembly API can be found on MDN .

Working with Non-Numeric Types

The code samples in this chapter only used numeric types in the WebAssembly modules. To run WebAssembly with more complex types (strings, classes) you will want to use tools that generate type bindings between JavaScript and the language used to compile to WebAssembly.

An example on how to create type bindings between JavaScript and Rust, compiling it into a binary and calling it from a JavaScript program can be found on MDN .

If you plan to do a lot of work with Web APIs in Rust+WebAssembly, you may find the web_sys and js_sys Rust crates useful. web_sys contains bindings to most of the Web APIs that are available in Deno, while js_sys provides bindings to JavaScript's standard, built-in objects.


For production builds it can be a good idea to perform optimizations on WebAssembly binaries. If you're mainly serving binaries over networks then optimizing for size can make a real difference, whereas if you're mainly executing WebAssembly on a server to perform computationally intensive tasks, optimizing for speed can be beneficial. You can find a good guide on optimizing (production) builds here . In addition, the rust-wasm group has a list of tools that can be used to optimize and manipulate WebAssembly binaries.