wait-on

import waitOn from 'wait-on'; import fs from 'node:fs/promises'; async function waitForResourcesAndProceed() { const tempFilePath = './temp-resource.txt'; const port = 8080; console.log('Waiting for temp file and port...'); // Simulate a file being created later setTimeout(async () => { await fs.writeFile(tempFilePath, 'This is a test file.'); console.log(`Created ${tempFilePath}`); }, 2000); try { await waitOn({ resources: [ tempFilePath, // defaults to file: type `tcp:${port}`, // wait for a TCP port 'http://localhost:8080/health' // wait for an HTTP endpoint ], delay: 1000, // initial delay in ms to allow resources to start interval: 100, // poll interval in ms timeout: 30000, // total timeout in ms window: 750 // period in ms to check resource availability (for files to stop growing) }); console.log('Resources are ready! Proceeding with application...'); // Clean up temporary file for demonstration await fs.unlink(tempFilePath); console.log(`Cleaned up ${tempFilePath}`); } catch (err) { console.error('One or more resources did not become available:', err); process.exit(1); } } waitForResourcesAndProceed();