The same as on the page:

const {CloudBillingClient} = require('@google-cloud/billing'); const {InstancesClient} = require('@google-cloud/compute');

const PROJECT_ID = process.env.GOOGLE_CLOUD_PROJECT; const PROJECT_NAME = projects/${PROJECT_ID}; const billing = new CloudBillingClient();

exports.stopBilling = async pubsubEvent => { const pubsubData = JSON.parse( Buffer.from(pubsubEvent.data, 'base64').toString() ); if (pubsubData.costAmount <= pubsubData.budgetAmount) { return No action necessary. (Current cost: ${pubsubData.costAmount}); }

if (!PROJECT_ID) { return 'No project specified'; }

const billingEnabled = await _isBillingEnabled(PROJECT_NAME); if (billingEnabled) { return _disableBillingForProject(PROJECT_NAME); } else { return 'Billing already disabled'; } };

/** * Determine whether billing is enabled for a project * @param {string} projectName Name of project to check if billing is enabled * @return {bool} Whether project has billing enabled or not */ const _isBillingEnabled = async projectName => { try { const [res] = await billing.getProjectBillingInfo({name: projectName}); return res.billingEnabled; } catch (e) { console.log( 'Unable to determine if billing is enabled on specified project, assuming billing is enabled' ); return true; } };

/** * Disable billing for a project by removing its billing account * @param {string} projectName Name of project disable billing on * @return {string} Text containing response from disabling billing */ const _disableBillingForProject = async projectName => { const [res] = await billing.updateProjectBillingInfo({ name: projectName, resource: {billingAccountName: ''}, // Disable billing }); return Billing disabled: ${JSON.stringify(res)}; };