Function isUndefined

isUndefined<T>(value: undefined | T): value is undefined
Checks if value is undefined, acts as a typescript safeguard.
Type Parameters
- T
Parameters
- value: undefined | T
Returns value is undefined
Example
```
[null, undefined, 1, 5].filter(isUndefined)
> [undefined]

[null, undefined, 1, 5].filter(isNot(isUndefined))
> [null, 1, 5]
```
- Defined in src/guards.ts:93