import type { Token } from 'markdown-it';
/**
 * @description
 * 获取容器内的主要内容
 * @param tokens
 * @param idx
 * @param klass
 * @example
 * ```ts
 * render (tokens: Token[], idx: number) {
 *  getMaincontentInContainer(tokens, idx)
 * }
 * ```
 * ```md
 * :::demo
 * test/demo
 * >>>label
 * subcontent
 * >>>
 * :::
 * => test/demo
 * ```
 */
export declare function getMaincontentInContainer(tokens: Token[], idx: number, klass: string): string | undefined;