/**
 * Errors and warnings wrapper.
 */
export type PreApplyMessages = {
    errorMessages: Array<string>;
    warningMessages: Array<string>;
};
/**
 * Validator that is called before applying the filter and act as a stopper for the GcpFilter apply event.
 */
export interface PreApplyValidator<T> {
    /**
     * Called before filter is applied. If there are errors returned the
     * filter won't be applied. Warning messages will not stop filter from applying.
     *
     * @param selection The current selection state of the filter that will be applied if there are no errors.
     *
     * @returns The error and warning messages to be displayed in the modifier.
     */
    preApplyValidation?(selection: T): PreApplyMessages;
}