/// <reference types="node" />
import { Field } from "../../validate";
/** NodeValidate.isBuffer options. */
export interface IIsBuffer {
    /** Optional encoding for buffer. */
    encoding?: BufferEncoding;
}
/** Validate that value is a valid Node.js Buffer. */
export declare function isBuffer(value?: string, options?: IIsBuffer): Buffer;
export declare class BufferField extends Field<Buffer> {
    protected readonly options: IIsBuffer;
    constructor(options?: IIsBuffer);
    validate(value: string): Buffer;
    format(value: Buffer): string;
}