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

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[Home](./index.md) &gt; [@apextoaster/js-utils](./js-utils.md) &gt; [isNil](./js-utils.isnil.md)

## isNil() function

> Warning: This API is now obsolete.
> 
> use `isNone` instead
> 

Check if a value is nil.

<b>Signature:</b>

```typescript
export declare function isNil<T>(val: Maybe<T>): val is Nil;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  val | [Maybe](./js-utils.maybe.md)<!-- -->&lt;T&gt; |  |

<b>Returns:</b>

val is [Nil](./js-utils.nil.md)
feat: add utils from isolex 2020-03-29 13:43:52 +00:00			`<!-- Do not edit this file. It is automatically generated by API Documenter. -->`

			`[Home](./index.md) > [@apextoaster/js-utils](./js-utils.md) > [isNil](./js-utils.isnil.md)`

			`## isNil() 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. 2021-07-10 21:54:41 +00:00			`> Warning: This API is now obsolete.`
			`>`
fix(docs): typedef and doc warnings 2022-10-08 19:52:35 +00:00			> use `isNone` instead
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. 2021-07-10 21:54:41 +00:00			`>`

fix(test): cover pid file, signal helpers, improve coverage for others 2020-03-31 02:31:51 +00:00			`Check if a value is nil.`

feat: add utils from isolex 2020-03-29 13:43:52 +00:00			`<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. 2021-07-10 21:54:41 +00:00			`export declare function isNil<T>(val: Maybe<T>): val is Nil;`
feat: add utils from isolex 2020-03-29 13:43:52 +00:00			```

			`## 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. 2021-07-10 21:54:41 +00:00			`\| val \| [Maybe](./js-utils.maybe.md)<!-- --><T> \| \|`
feat: add utils from isolex 2020-03-29 13:43:52 +00:00
			`<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). 2020-06-29 23:23:16 +00:00			`val is [Nil](./js-utils.nil.md)`
feat: add utils from isolex 2020-03-29 13:43:52 +00:00