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js-utils/docs/api/js-utils.doesexist.md

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<!-- Do not edit this file. It is automatically generated by API Documenter. -->
[Home](./index.md) &gt; [@apextoaster/js-utils](./js-utils.md) &gt; [doesExist](./js-utils.doesexist.md)
## doesExist() function
feat(maybe): deprecate Optional and Nil types in favor of Maybe and None BREAKING CHANGE: while the Optional type has been deprecated, some Array and Maybe-related functions have been renamed to be more consistent.
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Check if a variable is some `T`<!-- -->.
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<b>Signature:</b>
```typescript
feat(maybe): deprecate Optional and Nil types in favor of Maybe and None BREAKING CHANGE: while the Optional type has been deprecated, some Array and Maybe-related functions have been renamed to be more consistent.
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export declare function doesExist<T>(val: Maybe<T>): val is T;
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```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
feat(maybe): deprecate Optional and Nil types in favor of Maybe and None BREAKING CHANGE: while the Optional type has been deprecated, some Array and Maybe-related functions have been renamed to be more consistent.
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| val | [Maybe](./js-utils.maybe.md)<!-- -->&lt;T&gt; | |
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<b>Returns:</b>
feat(build): bundle as ES module BREAKING CHANGE: removes the umd module in favor of a smaller, standard ES module. Consumers will need native support for ES modules (recent evergreen browsers) or a bundler with the same (rollup, webpack, etc).
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val is T
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