import { Constraint, RuleSpec, ValidationResult, ValidationSeverity, When } from '@xh/hoist/data';
/**
 * Immutable object representing a validation rule.
 */
export declare class Rule {
    readonly check: Constraint[];
    readonly when: When;
    constructor(spec: RuleSpec);
}
/**
 * Utility to determine the maximum severity from a list of ValidationResults.
 *
 * @param validationResults - list of ValidationResults to evaluate.
 * @returns The highest severity level found, or null if none.
 */
export declare function maxSeverity(validationResults: ValidationResult[]): ValidationSeverity;