import { Operator } from "@lume/kiwi";
/** Relational operators for constraints */
export declare enum UIRelation {
    /** Equality: LHS = RHS */
    EQUAL = 0,
    /** Less than or equal: LHS <= RHS */
    LESS_THAN = 1,
    /** Greater than or equal: LHS >= RHS */
    GREATER_THAN = 2
}
/**
 * Converts relation to solver operator.
 * @param relation Relation type
 * @returns Solver operator
 * @throws If relation is invalid
 */
export declare function convertRelation(relation: UIRelation): Operator;
/**
 * Resolves optional relation.
 * @param relation Relation to resolve
 * @returns Relation or EQUAL if undefined
 */
export declare function resolveRelation(relation?: UIRelation): UIRelation;