Typescript Error with JWT Auth

Hello

I’m trying to integrate Box into my app for file storage. I think I want JWT Auth as the app will only ever store files in its own Box account. I’m getting a typescript error: Type '{ clientId: string; clientSecret: string; jwtKeyId: string; privateKey: string; privateKeyPassphrase: string; enterpriseId: string; }' is missing the following properties from type 'JwtConfig': tokenStorage, privateKeyDecryptor

with the following code: 

const config = {
   clientId: BOX_CLIENT_ID,
   clientSecret: BOX_CLIENT_SECRET,
   jwtKeyId: '8495cr9l',
   privateKey: Buffer.from(BOX_PRIVATE_KEY_BASE64, 'base64').toString('ascii'),
   privateKeyPassphrase: BOX_PASSPHRASE,
   enterpriseId: BOX_ENTERPRISE_ID,
}
const jwtAuth = new BoxJwtAuth({config})