import { Severity } from '@useoptic/openapi-utilities';
type RuleConfig = {
    message: string;
    severity?: 'info' | 'warn' | 'error';
} & ({
    expected?: undefined;
    received?: undefined;
} | {
    expected: any;
    received: any;
});
export declare class RuleError extends Error {
    details: RuleConfig;
    type: 'rule-error';
    severity?: Severity;
    constructor(details: RuleConfig);
    toString(): string;
    static isInstance(v: any): v is RuleError;
}
export {};
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