Install the Checkly CLI: npm install --save-dev checkly; initialize the project with npx checkly init to generate a checkly.config.ts and example check files
Define a BrowserCheck in TypeScript using the @checkly/cli package, referencing a Playwright test script in the playwrightScript field
Set alert channels in the config by referencing EmailAlertChannel or SlackAlertChannel constructs
Run npx checkly test to execute checks against the Checkly cloud without deploying; dry-run validates scripts before committing
Add a GitHub Actions workflow step that runs npx checkly deploy --force on merge to main, passing CHECKLY_API_KEY and CHECKLY_ACCOUNT_ID as secrets
Verify deployed checks in the Checkly dashboard or via GET /v1/checks using the Checkly Management API
Known gotchas
The Checkly CLI v4+ uses TypeScript constructs rather than the older YAML format; mixing old YAML-defined checks with CLI-managed checks in the same account can cause naming conflicts
Browser checks run Playwright under the hood; only Playwright APIs supported by Checkly's pinned runtime version are available — check the Checkly docs for the current supported Playwright version
npx checkly deploy is idempotent based on check logical ID; renaming a check file without updating the logicalId causes a new check to be created alongside the old one
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