import { InputProps } from '../useInput';
/**
 * A hook that returns a validation function checking for a record field uniqueness
 * by calling the dataProvider getList function with a filter.
 *
 * @example // Passing options at declaration time
 * const UserCreateForm = () => {
 *     const unique = useUnique({ message: 'Username is already used'});
 *     return (
 *         <SimpleForm>
 *             <TextInput source="username" validate={unique()} />
 *         </SimpleForm>
 *     );
 * }
 *
 * @example // Passing options at call time
 * const UserCreateForm = () => {
 *     const unique = useUnique();
 *     return (
 *         <SimpleForm>
 *             <TextInput source="username" validate={unique({ message: 'Username is already used'})} />
 *         </SimpleForm>
 *     );
 * }
 *
 * @example // With additional filters
 * const UserCreateForm = () => {
 *     const unique = useUnique();
 *     return (
 *         <SimpleForm>
 *             <ReferenceInput source="organization_id" reference="organizations" />
 *             <FormDataConsumer>
 *                 {({ formData }) => (
 *                     <TextInput
 *                         source="username"
 *                         validate={unique({ filter: { organization_id: formData.organization_id })}
 *                     />
 *                 )}
 *             </FormDataConsumer>
 *         </SimpleForm>
 *     );
 * }
 */
export declare const useUnique: (options?: UseUniqueOptions) => (callTimeOptions?: UseUniqueOptions) => (value: any, allValues: any, props: InputProps) => Promise<string | {
    message: any;
    args: {
        source: string;
        value: any;
        field: string | number | true | import("react").ReactElement<any, string | import("react").JSXElementConstructor<any>> | Iterable<import("react").ReactNode> | null;
    };
} | undefined>;
export type UseUniqueOptions = {
    debounce?: number;
    resource?: string;
    message?: string;
    filter?: Record<string, any>;
};
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