import { FormlyExtension } from '@ngx-formly/core';
/**
 * 添加默认placeholder
 */
export declare const defaultPlaceholderExtension: FormlyExtension;
/**
 * 默认placeholder 配置
 */
export declare const defaultPlaceholderExtensionOption: {
    name: string;
    extension: FormlyExtension<import("@ngx-formly/core").FormlyFieldConfig<import("@ngx-formly/core").FormlyFieldProps & {
        [additionalProperties: string]: any;
    }>>;
};