Define and deploy Checkly synthetic monitoring checks as code using the Checkly CLI and TypeScript

Steps

1. Install the Checkly CLI: npm install -g checkly; run checkly login to authenticate with your Checkly account
2. Initialize a new project with checkly create and choose a template; the CLI scaffolds a checkly.config.ts file and an example check definition
3. Define API checks using the ApiCheck class: specify a name, frequency (e.g., Frequency.EVERY_1M), request method and URL, and an assertions array using AssertionBuilder helpers
4. Define browser checks using the BrowserCheck class, pointing to a Playwright test file; the check runs your Playwright script on Checkly's global infrastructure
5. Run checkly test --record to execute checks against your Checkly account and record results; use checkly deploy to publish the configuration to production monitoring
6. Add checks to alert channels (Slack, PagerDuty, email) by defining alert channel resources in your config and referencing them from check alertChannels arrays