function main(projectId, zone, instanceName, instanceTemplateUrl) {
  // [START compute_instances_create_from_template]
  /**
   * TODO(developer): Uncomment and replace these variables before running the sample.
   */
  // const projectId = 'YOUR_PROJECT_ID';
  // const zone = 'europe-central2-b'
  // const instanceName = 'YOUR_INSTANCE_NAME'
  // const instanceTemplateUrl = 'YOUR_INSTANCE_TEMPLATE_URL'

  const compute = require('@google-cloud/compute');

  // Create a new instance from template in the specified project and zone.
  async function createInstanceFromTemplate() {
    const instancesClient = new compute.InstancesClient();

    console.log(
      `Creating the ${instanceName} instance in ${zone} from template ${instanceTemplateUrl}...`
    );

    const [response] = await instancesClient.insert({
      project: projectId,
      zone,
      instanceResource: {
        name: instanceName,
      },
      sourceInstanceTemplate: instanceTemplateUrl,
    });
    let operation = response.latestResponse;
    const operationsClient = new compute.ZoneOperationsClient();

    // Wait for the create operation to complete.
    while (operation.status !== 'DONE') {
      [operation] = await operationsClient.wait({
        operation: operation.name,
        project: projectId,
        zone: operation.zone.split('/').pop(),
      });
    }

    console.log('Instance created.');
  }

  createInstanceFromTemplate();
  // [END compute_instances_create_from_template]
}
Creates a Compute Engine VM instance from an instance template.

@param {string} projectId - ID or number of the project you want to use.
@param {string} zone - Name of the zone you want to check, for example: us-west3-b
@param {string} instanceName - Name of the new instance.
@param {string} instanceTemplateUrl - URL of the instance template using for creating the new instance. It can be a full or partial URL.
   Examples:
   - https://www.googleapis.com/compute/v1/projects/project/global/instanceTemplates/example-instance-template
   - projects/project/global/instanceTemplates/example-instance-template
   - global/instanceTemplates/example-instance-template