32 lines
652 B
Markdown
32 lines
652 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) > [mustExist](./js-utils.mustexist.md)
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## mustExist() function
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Assert that a variable is not `None` and return the value. Throw if it is `None`<!-- -->.
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<b>Signature:</b>
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```typescript
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export declare function mustExist<T>(val: Maybe<T>, err?: string): T;
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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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| err | string | |
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<b>Returns:</b>
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T
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val
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## Exceptions
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NotFoundError
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