Break out some utils

src/app/modal.ts

@@ -0,0 +1,21 @@
+import type {ComponentType} from "svelte"
+import {readable, writable} from "svelte/store"
+import {randomId} from "@welshman/lib"
+import {pushState} from "$app/navigation"
+
+export const modals = new Map()
+
+export const pushModal = (component: ComponentType, props: Record<string, any>) => {
+  const id = randomId()
+
+  // TODO: fix memory leak here by listening to history somehow
+  modals.set(id, {component, props})
+  pushState("", {modal: id})
+
+  return id
+}
+
+export const popModal = (id: string) => {
+  modals.delete(id)
+  history.back()
+}