export declare type RegExpMap = Record<string, RegExpMapped>;
export declare type RegExpMapped = RegExp & {
    map: RegExpMap;
    keys: Set<string>;
};
export interface SyntaxDefinition {
    [k: string]: RegExp | [RegExp, SyntaxDefinition];
}
export declare type SyntaxOrImport = SyntaxDefinition | Promise<{
    default: SyntaxDefinition;
}>;
/**
 * Compiles a syntax definition.
 *
 * ```js
 * const r = await compile({
 *   foo: /[a-z]/,
 *   bar: /[0-9]/,
 * })
 * ```
 *
 * @param def The syntax definition to compile. Can be a promise returned by `import()`.
 */
export declare const compile: (def: SyntaxOrImport, keys?: Set<string>) => Promise<RegExpMapped>;
/**
 * Syntax highlights a string as html with the given syntax.
 *
 * ```js
 * const regexp = await compile({
 *   foo: /[a-z]+/,
 *   bar: [
 *     /[0-9]+/,
 *     {
 *       bar: /[0-5]+/,
 *     },
 *   ],
 * })
 * const html = syntax(regexp, 'hello 123 789 world')
 * ```
 *
 * @param regexp The syntax definition returned by `compile()`
 * @param s The string to highlight.
 */
export declare const syntax: (regexp: RegExpMapped | RegExp, s: string) => string;