Breaking change with TypeScript: migrating from Deno to Bun

[rohitpaulk]

Hey everyone,

We recently launched our Typescript Track (TypeScript track is live!), and found during beta testing that a lot of Deno behaviour was confusing, especially things like deno.lock and deno.json.

We’re instead migrating to Bun. If you’ve already created a TypeScript repository you should soon see an email that points to this post.

Upgrade instructions

When you run tests / git push on your old typescript repository, you’ll now see this error message:

If you aren’t far along in the challenge, deleting your current repository and creating a new one is a simple way to fix everything. You’ll find the delete button here:

If you do want to retain progress on the current repository:

1. Change the value of language_pack in your codecrafters.yml from deno-1.42 to bun-1.1:

2. Run bun install locally so that you get the following files created:

You can use the default options for package name, entry point etc.

3. Finally, change spawn_redis_server.sh:

That should be it! Tests should run fine on your next git push.

Please let us know here if you run into any issues.