This is CodeSandbox 1.5! I don't know how to call all updates anymore, so I decided to version CodeSandbox with arbitrary numbers.
This is a big update, I rewrote the editor, the preview screen and the packager. All these changes made the deployment quite exciting, but it's online now. Let's get started!
Peek Definition, Go to Definition, Find all References
The really cool thing about
monaco-editor is that you get the core editor
features (Go to Definition, Peek Definition, etc.) of vscode for free. The only
thing you need to do is wiring everything up correctly, I created a separate
build of the Monaco editor for better cross file integration in CodeSandbox.
Automatic Type Acquisition
Not only navigation gets easier, the
That's really cool, and even better if you have the typings of dependencies.
That's why I added 'Automatic Type Acquisition', this means that for every
'installed' dependency we search and download the type definitions on
https://unpkg.com. This way you get autocomplete for
ESLint, Prettier, Emmet.io
I ported almost all existing editor features over. This means that you have ESLint, Prettier and Emmet.io built in in the editor! Unfortunately I had to drop Vim Mode, you can still enable this, but this will disable Monaco and enable CodeMirror.
I'm really happy with the new editor, and want to state that this could never
monaco-editor, TypeScript, unpkg, Emmet.io, ESLint and Prettier.
I want to explicitly thank these tools, the only thing I had to do is wire
everything up and patch some integrations.
We have another tool that made CodeSandbox much better, namely
handling in CodeSandbox has been redone, and thanks to
now support async errors and deep linked errors + have a beautiful error
overlay. Furthermore I rewrote the error handling of the preview so errors now
show up in the right file.
CodeSandbox not only shows errors, it also offers suggestions for known errors.
In the example above
DeepComponent.js is importing
RawComponent, notice that
there is no extension. This will throw an
Invalid Tag error. We can easily
detect this and give the suggestion to rename the file. I'm thinking of writing
an API that allows library developers to add suggestions for errors for their
It's now possible to open sandboxes in an external url. You can use this to see the preview in a separate window during development, or to share a fullscreen version of your sandbox with friends. Note that this external frame is nowhere near a production version, I'm working together with Vercel to integrate 'Deploy to Vercel' so you can deploy a production version automagically ✨.
The external sandbox also works offline. Which takes me to the next point...
CodeSandbox is now backed by service workers. This means that you can open the editor and the preview while offline and see CodeSandbox instead of a dinosaur 🙃. Note that offline support is currently limited, you cannot save your sandboxes offline yet (you can still download though). I need to make some required changes to the server to be able to do this. You are able to edit sandboxes though! This feature is really an improvement in speed, it will save network roundtrips for e.g. dependencies.
Dependency Packager Rewrite
The packager of the dependencies has been rewritten. It's now hosted as a serverless solution, which means that it can scale (practically) indefinitely. We also saw a nice improvement in speed, we saw improvements between 40%-700%(!) in response time.
A new feature that comes with the new packager is that we support version ranges
instead besides absolute versions. You will be able to install
example, and it will update automatically as React updates.
This functionality will be deployed somewhere this week, I need to change some
server logic first.
After working with Serverless, I have to say that I'm really impressed by how it works in practice. Our hosting costs went down from ~$50 per month to a projected cost of $0.03 per month + we are now faster, more scalable and deployment is a breeze. I will write a post about this when I find the time.
NOTE: The packager has been rolled back for now, some package combinations couldn't be loaded because of disk space limitations, it's solvable.
You can see a trend in these features, every feature makes heavy use of some
existing technology. It saved me tons of time, and I want to specifically list
another thank you to the authors that made this possible.
- The VS Code team, for taking the effort
monaco-editorand being open source. This is really valuable for the online editor movement.
- https://unpkg.com for allowing us & making it easy to download typings automatically from npm.
- ESLint, Prettier and Emmet.io for not only making these valuable productivity boost tools, but also for keeping them compatible with the browser.
- Everyone behind
create-react-app, and specifically
react-error-overlay. Implementing this started as a joke, but turned out much easier than I expected and actually went through.
sw-precache, they made implementing offline support a breeze. Their config is superb.
- Serverless for their work in making serverless development and deployment easier & more accessible. They're doing a very important job and are doing it really well.