Function hasDatasetEntry

hasDatasetEntry(
    target: null | Target,
    key: string,
    value?: DatasetValue,
): boolean
Returns true if the target has a dataset entry with key and optionally, the matching value.
Parameters
- target: null | Target
  Element, EventTarget, or CSS selector.
- key: string
  Property (e.g. someProperty) or attribute name (e.g. data-some-property) for the dataset entry.
- Optionalvalue: DatasetValue
  Optional dataset value to check for.
Returns boolean
Throws
elements!InvalidElementError if the specified target wasn't found.
Example
HTML
```
<div
  id="example"
  data-is-active="false"
  data-count="30"
  data-label="Example"
>
  ...
</div>
```
Code
```
const element = findElement("#example")!;

hasDatasetEntry(element, "data-is-active");
// true

hasDatasetEntry(element, "isActive", "false");
// false ("false" cannot be a string, must be the boolean value `false`)

hasDatasetEntry(element, "data-count", 30);
// true
```
- Defined in src/dataset/hasDataset.ts:60