typescript ab2str & str2ab

buffer.ts

/**
 * Converts an ArrayBuffer to a String.
 *
 * @param buffer - Buffer to convert.
 * @returns String.
 */
export const arrayBufferToString = (buffer: ArrayBuffer) =>
  String.fromCharCode.apply(null, Array.from(new Uint16Array(buffer)))

/**
 * Converts a String to an ArrayBuffer.
 *
 * @param str - String to convert.
 * @returns ArrayBuffer.
 */
export const stringToArrayBuffer = (str: string) => {
  const stringLength = str.length
  const buffer = new ArrayBuffer(stringLength * 2)
  const bufferView = new Uint16Array(buffer)
  for (let i = 0; i < stringLength; i++) bufferView[i] = str.charCodeAt(i)
  return buffer
}