MailDataRequired requires MailContent?

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Issue Summary

I'm running into a problem with Typescript because it doesn't let me build an email without a content field. Is the MailDataRequired correct?

I never used to send content with my emails. Only substitutions. The content / templates live on your servers.

Code Snippet

export type MailDataRequired = MailData & (
    { text: string } | { html: string } | { templateId: string } | { content: MailContent[] & { 0: MailContent } });

Exception/Log

# paste exception/log here

Technical details:

• sendgrid-nodejs version: @sendgrid/client@^6.5.3