import { Bytes } from '../bytes.js';
import { ISyncWritable } from '../types.js';
import { IFrameDecoder, IFrameEncoder } from './types.js';
/** options for {@link LengthDelimitedCodec} */
export interface LengthDelimitedCodecOptions {
    /**
     * function that will be called to read the length of the frame
     *
     * @example  `read.uint32le`
     */
    read?: (r: Bytes) => number | null;
    /**
     * function that will be called to write the length of the frame
     *
     * @example  `write.uint32le`
     */
    write?: (w: ISyncWritable, n: number) => void;
}
/** a simple frame codec that uses a length prefix to separate frames */
export declare class LengthDelimitedCodec implements IFrameDecoder, IFrameEncoder {
    #private;
    constructor(options: LengthDelimitedCodecOptions);
    decode(buf: Bytes): Uint8Array | null;
    encode(frame: Uint8Array, into: ISyncWritable): void;
    reset(): void;
}