import { SerialParser } from '../types/index.js';
/**
 * Creates a fixed-length parser that buffers bytes and emits
 * `Uint8Array` chunks of exactly `length` bytes.
 *
 * Excess bytes are retained in the internal buffer for the next emission.
 *
 * @param length - The exact number of bytes per emitted chunk. Must be > 0.
 * @returns A {@link SerialParser} that emits `Uint8Array` values.
 * @throws {Error} If `length` is not a positive integer.
 *
 * @example
 * ```ts
 * import { AbstractSerialDevice, fixedLength } from 'webserial-core';
 *
 * class SensorDevice extends AbstractSerialDevice<Uint8Array> {
 *   constructor() {
 *     super({ baudRate: 115200, parser: fixedLength(8) });
 *   }
 * }
 * ```
 */
export declare function fixedLength(length: number): SerialParser<Uint8Array>;