We've released a release candidate of the next major version of Wrangler, the CLI for Cloudflare Workers — wrangler@4.0.0-rc.0.

You can run the following command to install it and be one of the first to try it out:

• npm

  npm i wrangler@v4-rc

• yarn

  yarn add wrangler@v4-rc

• pnpm

  pnpm add wrangler@v4-rc

Unlike previous major versions of Wrangler, which were foundational rewrites and rearchitectures — Version 4 of Wrangler includes a much smaller set of changes. If you use Wrangler today, your workflow is very unlikely to change. Before we release Wrangler v4 and advance past the release candidate stage, we'll share a detailed migration guide in the Workers developer docs. But for the vast majority of cases, you won't need to do anything to migrate — things will just work as they do today. We are sharing this release candidate in advance of the official release of v4, so that you can try it out early and share feedback.

New JavaScript language features that you can now use with Wrangler v4

Version 4 of Wrangler updates the version of esbuild that Wrangler uses internally, allowing you to use modern JavaScript language features, including:

The using keyword from Explicit Resource...