25 lines
578 B
Markdown
25 lines
578 B
Markdown
<!-- Do not edit this file. It is automatically generated by API Documenter. -->
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[Home](./index.md) > [@apextoaster/js-utils](./js-utils.md) > [isNone](./js-utils.isnone.md)
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## isNone() function
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Typeguard to check if a `Maybe` is `None` (null or undefined).
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<b>Signature:</b>
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```typescript
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export declare function isNone<T>(val: Maybe<T>): val is None;
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```
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## Parameters
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| Parameter | Type | Description |
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| --- | --- | --- |
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| val | [Maybe](./js-utils.maybe.md)<!-- --><T> | |
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<b>Returns:</b>
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val is [None](./js-utils.none.md)
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