Wrapper Scripts

Raw native bindings are often low-level. We use JavaScript wrapper scripts to provide a friendly Web API (like fetch, Request, Response).

Polyfilling fetch

Instead of exposing fetch directly from Rust, we can expose a low-level __nativeFetch and wrap it.

globalThis.fetch = function(url, options) {
    return new Promise((resolve, reject) => {
        __nativeFetch(url, options, (responseMeta) => {
            // Create Response object
            const response = new Response(null, responseMeta);
            resolve(response);
        }, (error) => {
            reject(new Error(error));
        });
    });
};

This allows us to implement the standard Promise API in JS, while the heavy lifting happens in Rust.