Provides an `EventListener` type that wraps `web_sys::EventTarget::add_event_listener` in an RAII fashion. It handles the lifecycle of closures (including `Closure::wrap`/`forget`), supports capture/bubble phases, passive listeners, and one-shot listeners via `FnOnce`. The implementation carefully manages unwind safety across wasm `catch_unwind` boundaries. This component is self-contained, reusable in any WASM project that needs DOM event listening, and demonstrates safe, idiomatic Rust patterns for bridging JavaScript callbacks.

Implements `Timeout` and `Interval` types with a `forget` pattern to manage `setTimeout`/`setInterval` handles. The drop implementation clears the timer, preventing callback leaks. It uses raw `wasm_bindgen` externs to avoid depending on `web_sys::Window` (works in workers), and handles the `FnOnce` vs `FnMut` distinction correctly. The `Cancel` method returns the closure, allowing reuse. This is a clean, minimal, reusable component for scheduling tasks in WASM.

Defines `JsValueSerdeExt`, an extension trait on `JsValue` for converting between Rust `serde`-serializable types and JavaScript values using `serde_json` and `js_sys::JSON`. It provides `from_serde` and `into_serde` methods. The trait is sealed to prevent external implementation, ensuring invariants. This component is a small, focused utility widely applicable in any WASM project needing serde-based serialization, and it cleanly lifts serde out of `wasm-bindgen` core.