chore: consolidate new foundation and archive v1 (#1495)
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category: Utilities
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---
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# useToNumber
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Reactively convert a string ref to number.
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## Usage
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```ts
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import { useToNumber } from '@vueuse/core';
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import { shallowRef } from 'vue';
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const str = shallowRef('123');
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const number = useToNumber(str);
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number.value; // 123
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```
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## Type Declarations
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```ts
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export interface UseToNumberOptions {
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/**
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* Method to use to convert the value to a number.
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*
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* Or a custom function for the conversion.
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*
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* @default 'parseFloat'
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*/
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method?: 'parseFloat' | 'parseInt' | ((value: string | number) => number);
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/**
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* The base in mathematical numeral systems passed to `parseInt`.
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* Only works with `method: 'parseInt'`
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*/
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radix?: number;
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/**
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* Replace NaN with zero
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*
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* @default false
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*/
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nanToZero?: boolean;
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}
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/**
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* Reactively convert a string ref to number.
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*
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* @__NO_SIDE_EFFECTS__
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*/
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export declare function useToNumber(
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value: MaybeRefOrGetter<number | string>,
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options?: UseToNumberOptions,
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): ComputedRef<number>;
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```
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