What are the "built-in" filter options for ag-grid? - ag-grid

Question

I see a reference to a built-in filter for "empty" in the doc below. Where can I find documentation for all built-in filter options?
https://www.ag-grid.com/javascript-grid-filtering/#adding-custom-filter-options

Answer 1

I couldn't find it in the documentation either.
However, you can look at the definition of the BaseFilter of the ag-grid here on the GitHub and get all the built-in filters.
export abstract class BaseFilter<T, P extends IFilterParams, M> extends Component implements IFilterComp {
public static EMPTY = 'empty';
public static EQUALS = 'equals';
public static NOT_EQUAL = 'notEqual';
public static LESS_THAN = 'lessThan';
public static LESS_THAN_OR_EQUAL = 'lessThanOrEqual';
public static GREATER_THAN = 'greaterThan';
public static GREATER_THAN_OR_EQUAL = 'greaterThanOrEqual';
public static IN_RANGE = 'inRange';
public static CONTAINS = 'contains'; //1;
public static NOT_CONTAINS = 'notContains'; //1;
public static STARTS_WITH = 'startsWith'; //4;
public static ENDS_WITH = 'endsWith'; //5;
// .....
}