0.1.0 (#1)

Co-authored-by: Julien Valverdé <julien.valverde@mailo.com>
Reviewed-on: https://gitea:3000/Thilawyn/effect-fc/pulls/1

packages/example/src/todo/TodosState.service.ts

@@ -0,0 +1,50 @@
+import { Todo } from "@/domain"
+import { KeyValueStore } from "@effect/platform"
+import { BrowserKeyValueStore } from "@effect/platform-browser"
+import { Chunk, Console, Effect, Option, Schema, Stream, SubscriptionRef } from "effect"
+import { SubscriptionSubRef } from "effect-fc/types"
+
+
+export class TodosState extends Effect.Service<TodosState>()("TodosState", {
+    effect: Effect.fn("TodosState")(function*(key: string) {
+        const kv = yield* KeyValueStore.KeyValueStore
+
+        const readFromLocalStorage = Console.log("Reading todos from local storage...").pipe(
+            Effect.andThen(kv.get(key)),
+            Effect.andThen(Option.match({
+                onSome: Schema.decode(
+                    Schema.parseJson(Schema.Chunk(Todo.TodoFromJson))
+                ),
+                onNone: () => Effect.succeed(Chunk.empty()),
+            }))
+        )
+
+        const saveToLocalStorage = (todos: Chunk.Chunk<Todo.Todo>) => Effect.andThen(
+            Console.log("Saving todos to local storage..."),
+            Chunk.isNonEmpty(todos)
+                ? Effect.andThen(
+                    Schema.encode(
+                        Schema.parseJson(Schema.Chunk(Todo.TodoFromJson))
+                    )(todos),
+                    v => kv.set(key, v),
+                )
+                : kv.remove(key)
+        )
+
+        const ref = yield* SubscriptionRef.make(yield* readFromLocalStorage)
+        const sizeRef = SubscriptionSubRef.makeFromPath(ref, ["length"])
+
+        yield* Effect.forkScoped(ref.changes.pipe(
+            Stream.debounce("500 millis"),
+            Stream.runForEach(saveToLocalStorage),
+        ))
+        yield* Effect.addFinalizer(() => ref.pipe(
+            Effect.andThen(saveToLocalStorage),
+            Effect.ignore,
+        ))
+
+        return { ref, sizeRef } as const
+    }),
+
+    dependencies: [BrowserKeyValueStore.layerLocalStorage],
+}) {}