Move collection to store module

packages/store/src/throttle.ts

@@ -0,0 +1,12 @@
+import {Readable, Subscriber} from "svelte/store"
+import {throttle} from "@welshman/lib"
+
+export const throttled = <T, S extends Readable<T>>(delay: number, store: S) => {
+  if (delay) {
+    const {subscribe} = store
+
+    store = {...store, subscribe: (f: Subscriber<T>) => subscribe(throttle(delay, f))}
+  }
+
+  return store
+}