How to use the @aws-crypto/serialize.aadFactory function in @aws-crypto/serialize

concatBuffers,
  MessageHeader, // eslint-disable-line no-unused-vars
  SerializationVersion,
  ObjectType,
  ContentType,
  serializeSignatureInfo,
  FRAME_LENGTH,
  MESSAGE_ID_LENGTH,
  raw2der,
  Maximum
} from '@aws-crypto/serialize'
import { fromUtf8 } from '@aws-sdk/util-utf8-browser'
import { getWebCryptoBackend } from '@aws-crypto/web-crypto-backend'

const serialize = serializeFactory(fromUtf8)
const { messageAADContentString, messageAAD } = aadFactory(fromUtf8)

export interface EncryptInput {
  suiteId?: AlgorithmSuiteIdentifier
  encryptionContext?: EncryptionContext
  frameLength?: number
  // plaintextLength?: number // Subtle Crypto functions are all one-shot, so frames and length are === plaintext.byteLength
}

export interface EncryptResult {
  messageHeader: MessageHeader
  result: Uint8Array
}

export async function encrypt (
  cmm: KeyringWebCrypto|WebCryptoMaterialsManager,
  plaintext: Uint8Array,

} from '@aws-crypto/material-management-browser'
import {
  deserializeSignature,
  MessageHeader, // eslint-disable-line no-unused-vars
  deserializeFactory,
  kdfInfo,
  decodeBodyHeader,
  aadFactory,
  concatBuffers,
  der2raw,
  HeaderInfo // eslint-disable-line no-unused-vars
} from '@aws-crypto/serialize'
import { fromUtf8, toUtf8 } from '@aws-sdk/util-utf8-browser'

const deserialize = deserializeFactory(toUtf8, WebCryptoAlgorithmSuite)
const { messageAADContentString, messageAAD } = aadFactory(fromUtf8)

export interface DecryptResult {
  messageHeader: MessageHeader
  plaintext: Uint8Array
}

export async function decrypt (
  cmm: KeyringWebCrypto|WebCryptoMaterialsManager,
  ciphertext: Uint8Array
): Promise {
  /* If the cmm is a Keyring, wrap it with WebCryptoDefaultCryptographicMaterialsManager. */
  cmm = cmm instanceof KeyringWebCrypto
    ? new WebCryptoDefaultCryptographicMaterialsManager(cmm)
    : cmm

  const headerInfo = deserialize.deserializeMessageHeader(ciphertext)