Yew 0.22 - For Real This Time

Mattuwu
MattuwuMaintainer of Yew

The Yew team is thrilled to announce the release of Yew 0.22! After a longer-than-expected journey, this release brings significant improvements to ergonomics, performance, and developer experience.

Highlights#

New #[component] Attribute#

The #[function_component] attribute has been renamed to #[component] for brevity:

// Before
#[function_component]
fn MyComponent() -> Html {
    html! { <div>{"Hello!"}</div> }
}

// After (0.22+)
#[component]
fn MyComponent() -> Html {
    html! { <div>{"Hello!"}</div> }
}

The old #[function_component] attribute is deprecated but still works, giving you time to migrate.

For-Loops in html!#

You can now use for-loops directly in the html! macro, making iteration more natural:

// Before - using iterator adapters
html! {
    <ul>
        { for items.iter().map(|item| html! { <li>{ item }</li> }) }
    </ul>
}

// After (0.22+) - native for-loop syntax
html! {
    <ul>
        for item in items {
            <li>{ item }</li>
        }
    </ul>
}

MSRV Raised to 1.84.0#

The minimum supported Rust version is now 1.84.0. This allows us to use newer language features and provide better error messages.

WASI Support for SSR#

Server-side rendering now works on WASI targets. See the original 0.22 announcement for details.

Better Cloning Ergonomics#

  • ImplicitClone is implemented for more yew types. This means less & and * and .clone() clutter in the html macro.

yew-agent: Vendored gloo-workers#

The yew-agent crate now includes its own web worker implementation, removing the external dependency on gloo-worker. This also adds support for module-type web workers:

let spawner = WorkerSpawner::<MyWorker>::new()
    .as_module(true)  // Use ES module workers
    .spawn();

yew-router: Query Parameter Traits#

The FromQuery and ToQuery traits from gloo are now re-exported via yew_router::query for more flexible query parameter handling, along with dynamic basename support.

Migration Guide#

See the migration guide for detailed instructions on upgrading from 0.21.

Contributors#

Many thanks to everyone who contributed to this release! Special thanks to:

And all the other contributors who helped make this release possible!

What's Next#

We're continuing to work on improving Yew's performance, developer experience, and documentation. Join us on Discord to get involved!

See the full changelog for all changes.