update-campaign-before-start.ts

const discountCampaign = client.campaign({
    sender_id: campaignSender.id,
    segment_ids: [indianUserSegment.id],
    message_template: {
      text: templateText,
      custom: {
        foo: 'bar',
      },
    },
});

const { campaign } = await discountCampaign.create();
// start campaign in 2 days
await discountCampaign.start({
    scheduledFor: new Date(Date.now() + 4000).toISOString(),
});

const res = await discountCampaign.update({
    ...campaign,
    name: 'New Campaign Name',
});