Preview changes to a template

//native

type Clerk = {

  apiKey: string;

};

/**

 * Preview changes to a template

 * Returns a preview of a template for a given template_type, slug and body

 */

export async function main(

  auth: Clerk,

  template_type: string,

  slug: string,

  body: {

    subject?: string;

    body?: string;

    from_email_name?: string;

    reply_to_email_name?: string;

  },

) {

  const url = new URL(

    `https://api.clerk.com/v1/templates/${template_type}/${slug}/preview`,

  );

  const response = await fetch(url, {

    method: "POST",

    headers: {

      "Content-Type": "application/json",

      Authorization: "Bearer " + auth.apiKey,

    },

    body: JSON.stringify(body),

  });

  if (!response.ok) {

    const text = await response.text();

    throw new Error(`${response.status} ${text}`);

  }

  return await response.json();

}