import { Node } from './node';
/**
 * Throw an exception with in its `message` `value`
 * and `name`.
 *
 * @param {*} value - Invalid value.
 * @param {string} name - Setting name.
 */
export declare function raise<T>(value: T, name: string): void;
/**
 * Clean a string in preperation of parsing.
 *
 * @example
 *   clean('\ufefffoo'); // 'foo'
 *   clean('foo\r\nbar'); // 'foo\nbar'
 *   clean('foo\u2424bar'); // 'foo\nbar'
 *
 * @param {string} value - Content to clean.
 * @return {string} - Cleaned content.
 */
export declare function clean(value: string): string;
/**
 * Normalize an identifier.  Collapses multiple white space
 * characters into a single space, and removes casing.
 *
 * @example
 *   normalizeIdentifier('FOO\t bar'); // 'foo bar'
 *
 * @param {string} value - Content to normalize.
 * @return {string} - Normalized content.
 */
export declare function normalizeIdentifier(value: string): string;
/**
 * Check whether a node is mergeable with adjacent nodes.
 *
 * @param {Object} node - Node to check.
 * @return {boolean} - Whether `node` is mergable.
 */
export declare function mergeable(node: Node): boolean;
export declare const validate: {
    boolean: (context: Object, name: string, def: boolean) => void;
    string: (context: Object, name: string, def: string, map: Object) => void;
    number: (context: Object, name: string, def: number) => void;
};