import { Condition, NestedData } from '../types.js';
/** The repeater row a rule is being evaluated for (spec 02 §2a). */
export interface RowScope {
    form: string;
    repeater: string;
    index: number;
}
export interface RowRef {
    form: string;
    repeater: string;
    sub: string;
}
/** Split a row-scoped ref, or `null` when it is a plain `Form.key` reference. */
export declare function parseRowRef(ref: string): RowRef | null;
/**
 * Read a "formName.fieldKey" reference out of nested data. With a `scope`, a
 * row-scoped ref (`Form.repeater[].sub`) reads that sub-field of the scoped row.
 */
export declare function readRef(data: NestedData, ref: string, scope?: RowScope): unknown;
/**
 * Ordering used by rule conditions AND the `compare` validator: numeric when
 * both sides coerce, date-aware, else lexicographic. Null = not comparable.
 */
export declare function compareValues(a: unknown, b: unknown): number | null;
export declare function evalCondition(cond: Condition | undefined, data: NestedData, scope?: RowScope): boolean;
/** Every row-scoped ref a condition mentions (`field` and `value_field`). */
export declare function conditionRowRefs(cond: Condition | undefined): RowRef[];