TypeScript
TypeScript is a first-class language on Cloudflare Workers. Cloudflare publishes type definitions to GitHub and npm (npm install -D @cloudflare/workers-types). All APIs provided in Workers are fully typed, and type definitions are generated directly from workerd, the open-source Workers runtime.
Known issues
Transitive loading of @types/node overrides `@cloudflare/workers-types
You project’s dependencies may load the @types/node package on their own. As of @types/[email protected] that package now overrides Request, Response and fetch types (possibly others) specified by @cloudflare/workers-types causing type errors.
The way to get around this issue currently is to pin the version of @types/node to 20.8.3 in your package.json like this:
package.json{ "overrides": { "@types/node": "20.8.3" }
}
For more information, refer to this GitHub issue.