import type { SharedConfig } from '@typescript-eslint/utils/ts-eslint';
/**
 * Convert severity value of different types to a string.
 * @param  severity severity value
 * @throws error if severity is invalid
 */
export declare function normalizeSeverityToString(severity: SharedConfig.RuleLevel): SharedConfig.SeverityString;
/**
 * Convert severity value of different types to a number.
 * @param  severity severity value
 * @throws error if severity is invalid
 */
export declare function normalizeSeverityToNumber(severity: SharedConfig.RuleLevel): SharedConfig.Severity;