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wasm-bindgen is a foundational Rust tool that enables seamless interoperability between Rust and JavaScript by generating the necessary bindings and glue code for WebAssembly modules. It allows developers to write performance-critical code in Rust, compile it to WebAssembly, and then expose functions, structs, and APIs directly to JavaScript in a natural and idiomatic way. The tool automates the process of bridging differences between Rust’s type system and JavaScript’s dynamic environment, making cross-language integration significantly easier. One of its key design principles is efficiency, following a “pay only for what you use” model where only the required bindings are generated, minimizing unnecessary overhead. It also integrates into modern build pipelines through tools like wasm-pack.
Features
- Automatic generation of bindings between Rust and JavaScript
- Selective code generation following a “pay only for what you use” model
- Integration with wasm-pack for building and publishing WASM modules
- Support for exporting Rust functions, structs, and classes to JavaScript
- Handling of complex type conversions between Rust and JS
- Optimizations for reducing final WebAssembly binary size
Project Samples
