Throw if template is invalid because of missing data

[romain-sen]

Hello everyone, I am new to postmark so maybe there is something I didn't understand about template validation.

I use the NodeJS SDK of postmark and this is what I would like to achieve :

async validateTemplate(templateId: number, templateModel: any) { // any for the example
  try {
    const template = await this.postmarkClient.getTemplate(templateId);
    const result = await this.postmarkClient.validateTemplate({
      TemplateType: template.TemplateType,
      HtmlBody: template.HtmlBody || "",
      TextBody: template.TextBody || "",
      Subject: template.Subject,
      TestRenderModel: templateModel,
    });
    if (!result.AllContentIsValid) {
      this.logger.error(...);
      return false;
    }
    return true;
  } catch (err) {
    this.logger.error(...);
    return false;
  }
}

The idea is that, even if I put some validation on the data I want to inject in the template, if the template is changed on Postmark web interface, I want my code to break and throw/log something. But most importantly, I don't want to send an invalid email with missing data.

However, when I use some invalid data, no error is trigger. AllContentIsValid is true and the email is sent with the template incomplete because my variables are missing.

const invalidTemplateModel = {
   invalid: "invalid",
   // missing fields
};

Is there a way to not send email and throw instead if at least one variable is missing in the TemplateModel ?

My workaround would be to use the result of const template = await this.postmarkClient.getTemplate(templateId), and then with regex find all the {{variable}} to check I have them all defined. But I would be surprised if there is no better way to do it with the SDK.