# carton 📦 ## Watcher, bundler, and test runner for your [SwiftWasm](https://swiftwasm.org/) apps The main goal of `carton` is to provide a smooth zero-config experience when developing for WebAssembly. It is still in development, but it aims to support these features (🐥 means "ready to use"): - 🥚 Creating basic package boilerplate for apps built with SwiftWasm with `carton init`. - 🐥 Watching the app for source code changes and reloading it in your browser with `carton dev`. - 🐣 Running your XCTest suite in the full JavaScript/DOM environment with `carton test`. - 🥚 Optimizing and packaging the app for distribution with `carton bundle`. It is currently work in progress, so watch the repository for imminent updates! ## Motivation The main motivation for `carton` came after I had enough struggles with [webpack.js](https://webpack.js.org), trying to make its config file work, looking for appropriate plugins. I'm convinced that the required use of `webpack` in SwiftWasm projects could limit the wider adoption of SwiftWasm itself. Hopefully, with `carton` you can avoid using `webpack` altogether. ## Requirements - macOS 10.15 and Xcode 11.4 or later for macOS users. - [Swift 5.2 or later](https://swift.org/download/) for Linux users. On either platform you should install cross-compilation SwiftWasm toolchain via [`swiftenv`](https://github.com/kylef/swiftenv) as described in [the SwiftWasm Book](https://swiftwasm.github.io/swiftwasm-book/GettingStarted.html), in addition to the host Swift 5.2 toolchain mentioned above. In the future, manual installation of SwiftWasm won't be required, please see issue [#3](https://github.com/swiftwasm/carton/issues/3) for more details. ## Installation On macOS `carton` can be installed with [Homebrew](https://brew.sh/). Make sure you have Homebrew installed and then run: ```sh brew tap swiftwasm/tap brew install carton ``` You'll have to build `carton` from sources on Linux. Clone the repository and run `swift build -c release`, the `carton` binary will be located in the `.build/release/carton` directory after that. ## How does it work? `carton` bundles a [WASI](wasi.dev) polyfill, which is currently required to run any SwiftWasm code, and the [JavaScriptKit](https://github.com/kateinoigakukun/JavaScriptKit/) runtime for convenience. `carton` also embeds an HTTP server for previewing your SwiftWasm app directly in a browser. The development version of the polyfill establishes a helper WebSocket connection to the server, so that it can reload development browser tabs when rebuilt binary is available. This brings the development experience closer to Xcode live previews, which you may have previously used when developing SwiftUI apps. `carton` does not require any config files for these basic development scenarios, while some configuration may be supported in the future, for example for complex asset pipelines if needed. The only requirement is that your `Package.swift` contains at least a single executable product, which then will be compiled for WebAssembly and served when you start `carton dev` in the directory where `Package.swift` is located. `carton` is built with [Vapor](https://vapor.codes/), [SwiftNIO](https://github.com/apple/swift-nio), [swift-tools-support-core](https://github.com/apple/swift-tools-support-core), and [OpenCombine](https://github.com/broadwaylamb/OpenCombine), and supports both macOS and Linux. (Many thanks to everyone supporting and maintaining those projects!) ## Roadmap Since a subset of Foundation and XCTest already work and are supplied in the latest snapshots of SwiftWasm SDK, the next top priority for `carton` is to allow running your XCTest suites directly in browsers and receiving test results back to the HTTP server, so that test results can be reported in CLI. This was blocked by [`XCTest` not allowing customized test report formats](https://bugs.swift.org/browse/SR-8436), which is now partially resolved with [a new argument available on `XCTMain`](https://github.com/apple/swift-corelibs-xctest/pull/306) and a custom [JSON test reporter](https://github.com/MaxDesiatov/XCTestJSONObserver/). After [a few other issues](https://github.com/swiftwasm/swift/pull/1233) are resolved with the SwiftWasm toolchain, I'll get `carton test` fully working with XCTest. There are a few more commands on the roadmap to be implemented, such as `carton init` for initializing basic SwiftWasm projects (potentially with configurable templates), `carton bundle` to produce an optimized production deployment bundle, SwiftPM resources support for bundled assets, `carton sdk` command for SDK installation and management and much more. As cross-compiling to WebAssembly and running apps and tests remotely is not too dissimilar to Android development, or even development on macOS for Linux through Docker, `carton` could potentially become a generic tool for cross-platform Swift developers. I'm not developing any Android apps currently, but if there are interested Swift for Android developers, I'd be very happy to review and merge their contributions enabling that. ## Contributing ### Sponsorship If this tool saved you any amount of time or money, please consider [sponsoring the work of its maintainer](https://github.com/sponsors/MaxDesiatov). While some of the sponsorship tiers give you priority support or even consulting time, any amount is appreciated and helps in maintaining the project. ### Coding Style This project uses [SwiftFormat](https://github.com/nicklockwood/SwiftFormat) and [SwiftLint](https://github.com/realm/SwiftLint) to enforce formatting and coding style. We encourage you to run SwiftFormat within a local clone of the repository in whatever way works best for you either manually or automatically via an [Xcode extension](https://github.com/nicklockwood/SwiftFormat#xcode-source-editor-extension), [build phase](https://github.com/nicklockwood/SwiftFormat#xcode-build-phase) or [git pre-commit hook](https://github.com/nicklockwood/SwiftFormat#git-pre-commit-hook) etc. To guarantee that these tools run before you commit your changes on macOS, you're encouraged to run this once to set up the [pre-commit](https://pre-commit.com/) hook: ``` brew bundle # installs SwiftLint, SwiftFormat and pre-commit pre-commit install # installs pre-commit hook to run checks before you commit ``` Refer to [the pre-commit documentation page](https://pre-commit.com/) for more details and installation instructions for other platforms. SwiftFormat and SwiftLint also run on CI for every PR and thus a CI build can fail with incosistent formatting or style. We require CI builds to pass for all PRs before merging. ### Code of Conduct This project adheres to the [Contributor Covenant Code of Conduct](https://github.com/swiftwasm/carton/blob/main/CODE_OF_CONDUCT.md). By participating, you are expected to uphold this code. Please report unacceptable behavior to conduct@carton.dev.