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[`Keymap`](Keymap) › [`isModifier`](Keymap/isModifier)
## Keymap.isModifier() method
Checks whether the modifier key is pressed during this event.
0.12.17
**Signature:**
```typescript
static isModifier(evt: MouseEvent | TouchEvent | KeyboardEvent, modifier: Modifier): boolean;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| <code>evt</code> | <code>MouseEvent</code><code> | </code><code>TouchEvent</code><code> | </code><code>KeyboardEvent</code> | |
| <code>modifier</code> | [`Modifier`](Modifier) | |
**Returns:**
`boolean`