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docs(wasm-languages): swift updates #1407

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Oct 31, 2024
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docs(wasm-languages): swift updates #1407

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31 changes: 19 additions & 12 deletions content/wasm-languages/swift.md
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Expand Up @@ -14,6 +14,10 @@ But it is no longer just for iOS apps.
Thanks to a recent community-led project, it is possible to [compile Swift into WebAssembly](https://swiftwasm.org/)
destined either for the browser or for a WASI environment.

## Compatibility

The latest [5.10 version of the SwiftWasm tools](https://book.swiftwasm.org/getting-started/setup.html#installation---latest-release-swiftwasm-510) uses an older version of wasi-libc that is not supported by Spin 3+. Therefore, Spin 2.x is necessary for running example Swift apps at this time. Assuming Swift 6.0 ships with an updated wasi-libc version, compatibility with Spin 3+ should then be possible.

## Available Implementations

The [SwiftWasm](https://swiftwasm.org/) project compiles Swift to WebAssembly. While this is a community-led project, the [stated goal](https://book.swiftwasm.org/index.html) of the project is:
Expand All @@ -32,8 +36,8 @@ Once that is done, the `swift` tool should report SwiftWasm support:

```
$ swift --version
SwiftWasm Swift version 5.5 (swiftlang-5.5.0)
Target: arm64-apple-darwin21.1.0
SwiftWasm Swift version 5.10-dev (LLVM e98989b1092ff3a, Swift 23e8e340a7a32a7)
Target: arm64-apple-darwin24.0.0
```

From there, the `swift` tool works as usual.
Expand Down Expand Up @@ -69,8 +73,8 @@ Once you have installed SwiftWasm, it is easy to build applications for the Ferm
The simplest Swift program for Spin (or Wagi) looks like this:

```swift
print("content-type: text/plain\n\n")
print("Hello, World!\n")
print("content-type: text/plain\n")
print("Hello, World!")
```

To compile, set the target to `wasm32-unknown-wasi` (which ensures that WASI support is enabled):
Expand All @@ -91,19 +95,22 @@ Hello, World!
To run it as a Spin web application, we can add a `spin.toml` that looks like this:

```toml
spin_version = "1"
authors = ["Fermyon Engineering <[email protected]>"]
description = "Hello world app."
spin_manifest_version = 2

[application]
name = "spin-hello"
trigger = { type = "http", base = "/" }
version = "1.0.0"
description = "Hello world app."
authors = ["Fermyon Engineering <[email protected]>"]

[[component]]
id = "hello"
source = "hello.wasm"
[component.trigger]
[[trigger.http]]
id = "trigger-hello"
component = "hello"
route = "/"
executor = { type = "wagi" }

[component.hello]
source = "hello.wasm"
```

Note that we use the `wagi` executor.
Expand Down
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