import { ValidatorFn } from '@angular/forms';
/**
 * Class to provide validators for the Clr Data List.
 */
export declare class ClrDataListValidators {
    /**
     * @description
     * Validator that requires the control's value to be found in a possible values array.
     * This prohibits the user from entering custom values.
     *
     * @usageNotes
     *
     * ### Validate against an array of possible values
     *
     * ```typescript
     * const control = new FormControl('1234', ClrDataListValidators.predefined(['ASDF', 'QWER']));
     *
     * console.log(control.errors); // {predefined: {predefined: ['ASDF', 'QWER'], actual: '1234'}}
     * ```
     *
     * @returns A validator function that returns an error map with the
     * `predefined` property if the validation check fails, otherwise `null`.
     *
     */
    static predefined(possibleValues: string[]): ValidatorFn;
}