1 files changed, 59 insertions, 0 deletions
diff --git a/futures/src/backend/wasm/wasm_bindgen.rs b/futures/src/backend/wasm/wasm_bindgen.rs
new file mode 100644
index 00000000..b726501a
--- /dev/null
+++ b/futures/src/backend/wasm/wasm_bindgen.rs
@@ -0,0 +1,59 @@
+//! A `wasm-bindgein-futures` backend.
+
+/// A `wasm-bindgen-futures` executor.
+#[derive(Debug)]
+pub struct Executor;
+
+impl crate::Executor for Executor {
+    fn new() -> Result<Self, futures::io::Error> {
+        Ok(Self)
+    }
+
+    fn spawn(&self, future: impl futures::Future<Output = ()> + 'static) {
+        wasm_bindgen_futures::spawn_local(future);
+    }
+}
+
+pub mod time {
+    //! Listen and react to time.
+    use crate::subscription::{self, Subscription};
+    use crate::BoxStream;
+
+    /// Returns a [`Subscription`] that produces messages at a set interval.
+    ///
+    /// The first message is produced after a `duration`, and then continues to
+    /// produce more messages every `duration` after that.
+    pub fn every<H: std::hash::Hasher, E>(
+        duration: std::time::Duration,
+    ) -> Subscription<H, E, wasm_timer::Instant> {
+        Subscription::from_recipe(Every(duration))
+    }
+
+    #[derive(Debug)]
+    struct Every(std::time::Duration);
+
+    impl<H, E> subscription::Recipe<H, E> for Every
+    where
+        H: std::hash::Hasher,
+    {
+        type Output = wasm_timer::Instant;
+
+        fn hash(&self, state: &mut H) {
+            use std::hash::Hash;
+
+            std::any::TypeId::of::<Self>().hash(state);
+            self.0.hash(state);
+        }
+
+        fn stream(
+            self: Box<Self>,
+            _input: BoxStream<E>,
+        ) -> BoxStream<Self::Output> {
+            use futures::stream::StreamExt;
+
+            wasm_timer::Interval::new(self.0)
+                .map(|_| wasm_timer::Instant::now())
+                .boxed_local()
+        }
+    }
+}