Andreas Kling aka @awesomekling wrote:
We’ve been evaluating a number of C++ successor languages for @ladybirdbrowser , and the one best suited to our needs appears to be @SwiftLang 🪶
Over the last few months, I’ve asked a bunch of folks to pick some little part of our project and try rewriting it in the different languages we were evaluating. The feedback was very clear: everyone preferred Swift!
Why do we like Swift?
First off, Swift has both memory & data race safety (as of v6). It’s also a modern language with solid ergonomics.
Something that matters to us a lot is OO. Web specs & browser internals tend to be highly object-oriented, and life is easier when you can model specs closely in your code. Swift has first-class OO support, in many ways even nicer than C++.
The Swift team is also investing heavily in C++ interop, which means there’s a real path to incremental adoption, not just gigantic rewrites.
Strong ties to Apple?
Swift has historically been strongly tied to Apple and their platforms, but in the last year, there’s been a push for “swiftlang” to become more independent. (It’s now in a separate GitHub org, no longer in “apple”, for example).
Support for non-Apple platforms is also improving, as is the support for other, LSP-based development environments.
What happens next?
We aren’t able to start using it just yet, as the current release of Swift ships with a version of Clang that’s too old to grok our existing C++ codebase. But when Swift 6 comes out of beta this fall, we will begin using it!
No language is perfect, and there are a lot of things here that we don’t know yet. I’m not aware of anyone doing browser engine stuff in Swift before, so we’ll probably end up with feedback for the Swift team as well.
I’m super excited about this! We must steer Ladybird towards memory safety, and the first step is selecting a successor language that we can begin adopting very soon. 🤓🐞
Actually, this isn’t true. Apple has a vested interest in cross platform Swift. They’ve been pushing hard for Swift on Linux because they want Swift to run on servers, and they’re right to. Look at how hard JavaScript dominates on the server-side because of one language everywhere.
https://swift.org/
That same page lists cross-platform CLI and server as intended use cases.
So the Ladybird browser will have no trouble running on Linux servers? Great! Now how about platforms where people use web browsers? i.e. Android, and Windows… Apple has no vested interest in cross platform support to platforms that matter for a web browser.
Swift already works on Android and Windows. The support for Windows is improving and on the way to being official instead of questionable. The Browser Company is already building their app on Windows with Swift.
Swift’s governance has had some bumps in the past but is improving. Apple does have a vested interest in Swift adoption outside of their platforms. The more popular it is in general, the better the community and ecosystem get.