chore: consolidate new foundation and archive v1 (#1495)
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---
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category: State
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---
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# useAsyncState
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Reactive async state. Will not block your setup function and will trigger changes once the promise is ready. The state is a `shallowRef` by default.
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## Usage
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```ts
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import { useAsyncState } from '@vueuse/core';
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import axios from 'axios';
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const { state, isReady, isLoading } = useAsyncState(
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axios.get('https://jsonplaceholder.typicode.com/todos/1').then((t) => t.data),
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{ id: null },
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);
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```
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### Manually trigger the async function
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You can also trigger it manually. This is useful when you want to control when the async function is executed.
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```vue
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<script setup lang="ts">
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import { useAsyncState } from '@vueuse/core';
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const { state, execute, executeImmediate } = useAsyncState(action, '', { immediate: false });
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async function action(event) {
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await new Promise((resolve) => setTimeout(resolve, 500));
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return `${event.target.textContent} clicked!`;
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}
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</script>
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<template>
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<p>State: {{ state }}</p>
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<button class="button" @click="executeImmediate">Execute now</button>
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<button class="ml-2 button" @click="(event) => execute(500, event)">Execute with delay</button>
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</template>
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```
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## Type Declarations
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```ts
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export interface UseAsyncStateReturnBase<Data, Params extends any[], Shallow extends boolean> {
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state: Shallow extends true ? Ref<Data> : Ref<UnwrapRef<Data>>;
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isReady: Ref<boolean>;
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isLoading: Ref<boolean>;
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error: Ref<unknown>;
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execute: (delay?: number, ...args: Params) => Promise<Data>;
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executeImmediate: (...args: Params) => Promise<Data>;
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}
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export type UseAsyncStateReturn<
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Data,
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Params extends any[],
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Shallow extends boolean,
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> = UseAsyncStateReturnBase<Data, Params, Shallow> &
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PromiseLike<UseAsyncStateReturnBase<Data, Params, Shallow>>;
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export interface UseAsyncStateOptions<Shallow extends boolean, D = any> {
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/**
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* Delay for the first execution of the promise when "immediate" is true. In milliseconds.
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*
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* @default 0
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*/
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delay?: number;
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/**
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* Execute the promise right after the function is invoked.
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* Will apply the delay if any.
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*
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* When set to false, you will need to execute it manually.
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*
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* @default true
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*/
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immediate?: boolean;
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/**
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* Callback when error is caught.
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*/
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onError?: (e: unknown) => void;
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/**
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* Callback when success is caught.
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* @param {D} data
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*/
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onSuccess?: (data: D) => void;
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/**
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* Sets the state to initialState before executing the promise.
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*
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* This can be useful when calling the execute function more than once (for
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* example, to refresh data). When set to false, the current state remains
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* unchanged until the promise resolves.
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*
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* @default true
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*/
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resetOnExecute?: boolean;
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/**
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* Use shallowRef.
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*
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* @default true
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*/
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shallow?: Shallow;
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/**
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*
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* An error is thrown when executing the execute function
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*
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* @default false
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*/
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throwError?: boolean;
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}
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/**
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* Reactive async state. Will not block your setup function and will trigger changes once
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* the promise is ready.
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*
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* @see https://vueuse.org/useAsyncState
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* @param promise The promise / async function to be resolved
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* @param initialState The initial state, used until the first evaluation finishes
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* @param options
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*/
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export declare function useAsyncState<
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Data,
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Params extends any[] = any[],
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Shallow extends boolean = true,
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>(
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promise: Promise<Data> | ((...args: Params) => Promise<Data>),
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initialState: MaybeRef<Data>,
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options?: UseAsyncStateOptions<Shallow, Data>,
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): UseAsyncStateReturn<Data, Params, Shallow>;
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```
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