import type { Term } from '@rdfjs/types';
/**
 * Declares what kind of RDF object value a predicate stores.
 *
 * This is schema data, not a query policy. Query capabilities are derived
 * from the declared data type:
 * - text/numeric/dateTime/iri/blankNode/literal with objectKey support
 *   can use exact/prefix/range/order.
 * - longText is stored for DB-side text search/contains and must not fall
 *   back to in-memory scans for range/order semantics.
 */
export type PredicateObjectDataType = 'iri' | 'blankNode' | 'text' | 'longText' | 'numeric' | 'dateTime' | 'literal';
export interface PredicateObjectDataTypes {
    [predicate: string]: PredicateObjectDataType;
}
export interface ObjectIndexFields {
    objectKind: PredicateObjectDataType;
    objectKey: string | null;
    objectText: string | null;
}
export interface ObjectIndexOptions {
    predicate?: string;
    predicateObjectDataTypes?: PredicateObjectDataTypes;
    textMaxBytes?: number;
}
export declare const DEFAULT_TEXT_MAX_BYTES = 2048;
export declare function getPredicateObjectDataType(predicate: string | undefined, predicateObjectDataTypes: PredicateObjectDataTypes | undefined): PredicateObjectDataType | undefined;
export declare function objectIndexFieldsFromTerm(term: Term, options?: ObjectIndexOptions): ObjectIndexFields;
export declare function objectIndexFieldsFromSerialized(serialized: string, options?: ObjectIndexOptions): ObjectIndexFields;
export declare function objectIndexFieldsFromOperatorValue(value: unknown, serialized: string, options?: ObjectIndexOptions): ObjectIndexFields;
export declare function isObjectValueComparable(fields: ObjectIndexFields): boolean;
export declare function literalFromPlainText(value: string): Term;