Crate web_task 

This crate is a modern alternative to web-bindgen-futures built around async-task.

Pros & Cons

Pros:

• Provides both spawn (for Send futures) and spawn_local (for !Send futures).
• spawn and spawn_local return Task<T> futures, which resolve to return values.
• It’s possible to cancel futures using task handles.
• Non-send futures (which are common on web) can have send task-handles.

Cons:

• Some older browser versions are not supported.

Platform Support

This crate only supports the wasm32-unknown-unknown target, and makes use of various browser-specific APIs.

Enabling the +atomics nightly target feature automatically enables a thread-safe runtime, which works with web-workers but which may have different performance characteristics.

Testing

This crate supports headless-browser testing using wasm-bindgen-test. To run the test-suite, install wasm-pack and run the following, substitution <BROWSER> for --chrome, --firefox, or --safari as desired.

wasm-pack test --headless <BROWSER>

To test the thread-safe backend, use the nightly toolchain, and uncomment the build instruction in .cargo/config.toml.

Functions

spawn

Spawns a Future<Output = T> that can execute on any thread; returns a Task.

spawn_local

Spawns a Future<Output = T> that executes on the current thread; returns a Task.