// Type definitions for utf8-buffer 1.0.0
// Project: https://github.com/rochars/byte-data
// Definitions by: Rafael da Silva Rocha <https://github.com/rochars>
// Definitions: https://github.com/rochars/utf8-buffer

/**
 * Read a string of UTF-8 characters from a byte buffer.
 * Invalid characters are replaced with 'REPLACEMENT CHARACTER' (U+FFFD).
 * @see https://encoding.spec.whatwg.org/#the-encoding
 * @see https://stackoverflow.com/a/34926911
 * @param {!Uint8Array|!Array<number>} buffer A byte buffer.
 * @param {number=} start The buffer index to start reading.
 * @param {?number=} end The buffer index to stop reading.
 *   Assumes the buffer length if undefined.
 * @return {string}
 */
export function unpack(
	buffer: Uint8Array|number[],
	start: number,
	end?: number): string;

/**
 * Write a string of UTF-8 characters to a byte buffer.
 * @see https://encoding.spec.whatwg.org/#utf-8-encoder
 * @param {string} str The string to pack.
 * @param {!Uint8Array|!Array<number>} buffer The buffer to pack the string to.
 * @param {number=} index The buffer index to start writing.
 * @return {number} The next index to write in the buffer.
 */
export function pack(
	str: string,
	buffer: Uint8Array|number[],
	index?: number): number;