chore: consolidate new foundation and archive v1 (#1495)

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2026-09-07 12:32:57 -05:00
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category: Sensors
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# useKeyModifier
Reactive [Modifier State](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/getModifierState). Tracks state of any of the [supported modifiers](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/getModifierState#browser_compatibility) - see Browser Compatibility notes.
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## Usage
```ts
import { useKeyModifier } from '@vueuse/core';
const capsLockState = useKeyModifier('CapsLock');
console.log(capsLockState.value);
```
## Events
You can customize which events will prompt the state to update. By default, these are `mouseup`, `mousedown`, `keyup`, `keydown`. To customize these events:
```ts
import { useKeyModifier } from '@vueuse/core';
const capsLockState = useKeyModifier('CapsLock', { events: ['mouseup', 'mousedown'] });
console.log(capsLockState); // null
// Caps Lock turned on with key press
console.log(capsLockState); // null
// Mouse button clicked
console.log(capsLockState); // true
```
## Initial State
By default, the returned ref will be `Ref<null>` until the first event is received. You can explicitly pass the initial state to it via:
```ts
import { useKeyModifier } from '@vueuse/core';
// ---cut---
const capsLockState1 = useKeyModifier('CapsLock'); // Ref<boolean | null>
const capsLockState2 = useKeyModifier('CapsLock', { initial: false }); // Ref<boolean>
```
## Type Declarations
```ts
export type KeyModifier =
| 'Alt'
| 'AltGraph'
| 'CapsLock'
| 'Control'
| 'Fn'
| 'FnLock'
| 'Meta'
| 'NumLock'
| 'ScrollLock'
| 'Shift'
| 'Symbol'
| 'SymbolLock';
export interface UseModifierOptions<Initial> extends ConfigurableDocument {
/**
* Event names that will prompt update to modifier states
*
* @default ['mousedown', 'mouseup', 'keydown', 'keyup']
*/
events?: WindowEventName[];
/**
* Initial value of the returned ref
*
* @default null
*/
initial?: Initial;
}
export type UseKeyModifierReturn<Initial> = ShallowRef<
Initial extends boolean ? boolean : boolean | null
>;
export declare function useKeyModifier<Initial extends boolean | null>(
modifier: KeyModifier,
options?: UseModifierOptions<Initial>,
): UseKeyModifierReturn<Initial>;
```