feat(web/vue): enhance async state management for useAsyncState with improved error handling and loading states

web/vue/src/composables/useAsyncState/index.ts

@@ -1,13 +1,8 @@
-import { ref, shallowRef } from 'vue';
+import { ref, shallowRef, watch, type Ref, type ShallowRef, type UnwrapRef } from 'vue';
-import { isFunction } from '@robonen/stdlib';
+import { isFunction, sleep } from '@robonen/stdlib';
-
-export enum AsyncStateStatus {
-  PENDING,
-  FULFILLED,
-  REJECTED,
-}
 
 export interface UseAsyncStateOptions<Shallow extends boolean, Data = any> {
+  delay?: number;
   shallow?: Shallow;
   immediate?: boolean;
   resetOnExecute?: boolean;
@@ -16,6 +11,19 @@ export interface UseAsyncStateOptions<Shallow extends boolean, Data = any> {
   onSuccess?: (data: Data) => void;
 }
 
+export interface UseAsyncStateReturnBase<Data, Params extends any[], Shallow extends boolean> {
+  state: Shallow extends true ? ShallowRef<Data> : Ref<UnwrapRef<Data>>;
+  isLoading: Ref<boolean>;
+  isReady: Ref<boolean>;
+  error: Ref<unknown | null>;
+  execute: (delay: number, ...params: Params) => Promise<Data>;
+  executeImmediately: (...params: Params) => Promise<Data>;
+}
+
+export type UseAsyncStateReturn<Data, Params extends any[], Shallow extends boolean> =
+  & UseAsyncStateReturnBase<Data, Params, Shallow>
+  & PromiseLike<UseAsyncStateReturnBase<Data, Params, Shallow>>;
+
 /**
  * @name useAsyncState
  * @category State
@@ -25,35 +33,82 @@ export function useAsyncState<Data, Params extends any[] = [], Shallow extends b
   maybePromise: Promise<Data> | ((...args: Params) => Promise<Data>),
   initialState: Data,
   options?: UseAsyncStateOptions<Shallow, Data>,
-) {
+): UseAsyncStateReturn<Data, Params, Shallow> {
   const state = options?.shallow ? shallowRef(initialState) : ref(initialState);
-  const status = ref<AsyncStateStatus | null>(null);
+  const error = ref<unknown | null>(null);
+  const isLoading = ref(false);
+  const isReady = ref(false);
 
-  const execute = async (...params: any[]) => {
+  const execute = async (delay = options?.delay ?? 0, ...params: any[]) => {
     if (options?.resetOnExecute)
       state.value = initialState;
 
-    status.value = AsyncStateStatus.PENDING;
+    isLoading.value = true;
+    isReady.value = false;
+    error.value = null;
+
+    if (delay > 0)
+      await sleep(delay);
 
     const promise = isFunction(maybePromise) ? maybePromise(...params as Params) : maybePromise;
 
     try {
       const data = await promise;
       state.value = data;
-      status.value = AsyncStateStatus.FULFILLED;
+      isReady.value = true;
       options?.onSuccess?.(data);
     }
-    catch (error) {
+    catch (e: unknown) {
-      status.value = AsyncStateStatus.REJECTED;
+      error.value = e;
-      options?.onError?.(error);
+      options?.onError?.(e);
 
       if (options?.throwError)
         throw error;
     }
+    finally {
+      isLoading.value = false;
+    }
 
     return state.value as Data;
   };
 
+  const executeImmediately = (...params: Params) => {
+    return execute(0, ...params);
+  };
+
   if (options?.immediate)
     execute();
+
+  const shell = {
+    state: state as Shallow extends true ? ShallowRef<Data> : Ref<UnwrapRef<Data>>,
+    isLoading,
+    isReady,
+    error,
+    execute,
+    executeImmediately,
+  };
+
+  function waitResolve() {
+    return new Promise<UseAsyncStateReturnBase<Data, Params, Shallow>>((resolve, reject) => {
+      watch(
+        isLoading,
+        (loading) => {
+          if (loading === false)
+            error.value ? reject(error.value) : resolve(shell);
+        },
+        { 
+          immediate: true,
+          once: true,
+          flush: 'sync',
+        },
+      );
+    });
+  }
+
+  return {
+    ...shell,
+    then(onFulfilled, onRejected) {
+      return waitResolve().then(onFulfilled, onRejected);
+    },
+  }
 }