The upcoming release of Ruby 3.2 is set to enhance the language’s compatibility with WebAssembly (Wasm), a technology that has garnered attention for its ability to improve the performance of web applications. Unveiled in the Ruby 3.2.0 Preview 1, released on April 3, this version introduces initial support for WASI (WebAssembly System Interface), which expands WebAssembly’s capabilities. This update allows CRuby, the standard Ruby interpreter, to run in a variety of environments, including web browsers, serverless edge platforms, and other WASI-based systems. This initial step paves the way for Ruby to be more integrated into modern, high-performance web applications.
The integration of WASI is particularly significant for developers looking to leverage Ruby in the growing WebAssembly ecosystem. WASI extends WebAssembly’s capabilities by providing a system interface that allows applications to interact with the underlying operating system, which is essential for running programs efficiently and securely outside of a browser. This new support for WASI in Ruby will enable developers to use CRuby in more diverse settings, including the popular TryRuby playground, which allows users to run Ruby code directly in their browser.
Despite the promise of enhanced capabilities, Ruby’s developers have been cautious about certain limitations. As WebAssembly and WASI are still evolving, features such as Fiber (for concurrency), exception handling, and garbage collection are not yet fully supported. However, Ruby’s team is addressing these challenges by utilizing Asyncify, a technique that controls program execution in WebAssembly environments. Additionally, a new virtual file system layer has been created to package Ruby applications into a single .wasm file, simplifying the distribution of Ruby applications and making it easier to deploy them in a WebAssembly context.
The move towards WebAssembly integration is not Ruby’s first foray into this space. Prior to this release, Ruby developers had already explored WebAssembly through Wasmer Ruby, a runtime based on the Wasmer project that enables server-side Ruby execution in WebAssembly environments. By building on this foundation and expanding its support for WASI, Ruby is positioning itself to take full advantage of the growing WebAssembly ecosystem, making it more versatile and suitable for modern web applications that demand both performance and security.