/**
 * 如果值是字符串类型，就直接返回
 * @param value
 * @returns
 */
export declare function takeString(value: any): string;
export declare function filterStringByRegexp(value: any, reg: RegExp): any;
export declare function filterStringByTrim(value: any): any;
/**
 * 转换成小写驼峰格式
 *
 * @example
 * ```javascript
 * camelize('innerHTML');          // 'innerHTML'
 * camelize('action_name');        // 'actionName'
 * camelize('css-class-name');     // 'cssClassName'
 * camelize('update:modalValue');  // 'update:modalValue'
 * camelize('update:modal-value');  // 'update:modalValue'
 * camelize('Q w Q');  // 'QWQ'
 * ```
 * @param str
 */
export declare function camelize(str: string): string;
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