chore: consolidate new foundation and archive v1 (#1495)
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category: Reactivity
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---
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# extendRef
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Add extra attributes to Ref.
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## Usage
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> Please note the extra attribute will not be accessible in Vue's template.
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```ts
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import { extendRef } from '@vueuse/core';
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import { shallowRef } from 'vue';
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const myRef = shallowRef('content');
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const extended = extendRef(myRef, { foo: 'extra data' });
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extended.value === 'content';
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extended.foo === 'extra data';
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```
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Refs will be unwrapped and be reactive
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```ts
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import { extendRef } from '@vueuse/core';
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// ---cut---
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const myRef = shallowRef('content');
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const extraRef = shallowRef('extra');
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const extended = extendRef(myRef, { extra: extraRef });
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extended.value === 'content';
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extended.extra === 'extra';
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extended.extra = 'new data'; // will trigger update
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extraRef.value === 'new data';
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```
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## Type Declarations
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```ts
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export type ExtendRefReturn<T = any> = Ref<T>;
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export interface ExtendRefOptions<Unwrap extends boolean = boolean> {
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/**
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* Is the extends properties enumerable
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*
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* @default false
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*/
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enumerable?: boolean;
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/**
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* Unwrap for Ref properties
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*
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* @default true
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*/
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unwrap?: Unwrap;
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}
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/**
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* Overload 1: Unwrap set to false
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*/
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export declare function extendRef<
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R extends Ref<any>,
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Extend extends object,
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Options extends ExtendRefOptions<false>,
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>(ref: R, extend: Extend, options?: Options): ShallowUnwrapRef<Extend> & R;
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/**
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* Overload 2: Unwrap unset or set to true
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*/
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export declare function extendRef<
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R extends Ref<any>,
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Extend extends object,
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Options extends ExtendRefOptions,
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>(ref: R, extend: Extend, options?: Options): Extend & R;
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```
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