import Courier from '@trycourier/courier';

const client = new Courier({
  apiKey: process.env['COURIER_API_KEY'], // This is the default and can be omitted
});

const notificationContentMutationResponse = await client.notifications.putContent('id', {
  content: { version: '2022-01-01', elements: [{ type: 'channel' }] },
  state: 'DRAFT',
});

console.log(notificationContentMutationResponse.id);

{
  "id": "nt_01abc123",
  "version": "2022-01-01",
  "elements": [
    {
      "id": "elem_1",
      "checksum": "abc123"
    },
    {
      "id": "elem_2",
      "checksum": "def456"
    }
  ],
  "state": "DRAFT"
}