Typescript def issue: `harperDbConfigOptions` does not reflect optional configs

[zackdotcomputer]

In the code, it is defined as:

export interface harperDbConfigOptions {
  harperHost: string;
  username: string;
  password: string;
  token: string;
  schema: string;
}

This means all fields are required. However the website says that schema is optional and only one of {username + password} or {token} need to be provided. Right now, you get a typescript error if you try to omit any field.