interface PasswordValidationStrategy extends InjectableStrategy {
  validate(ctx: RequestContext, password: string): Promise<boolean | string> | boolean | string;
}

Validates a password submitted during account registration or when a customer updates their password. The method should resolve to true if the password is acceptable. If not, it should return false or optionally a string which will be passed to the returned ErrorResult, which can e.g. advise on why exactly the proposed password is not valid.