Agent skill

swift-wasm

Swift WASM development for setup, build, optimize, debug, and test workflows in Raven and related apps.

View SKILL.md on GitHub Repository
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Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/other/swift-wasm

SKILL.md

Swift WASM Development Skill

Comprehensive guidance for Swift 6.2 WebAssembly workflows used by Raven.

Quick Actions

  • setup: Set up Swift toolchain and WASM SDK
  • build: Build the current project for WASM
  • dev: Start development workflow/server
  • optimize: Build an optimized production bundle
  • debug: Diagnose build/runtime WASM issues
  • test: Run tests and browser validation

Project Docs To Prefer

  • QUICKSTART.md
  • Documentation/GettingStarted.md
  • Docs/bundle-size-quickstart.md

Setup Commands

bash
brew install swiftly
swiftly install 6.2.3
swiftly use 6.2.3
swift --version

swift sdk install \
  https://download.swift.org/swift-6.2.3-release/wasm-sdk/swift-6.2.3-RELEASE/swift-6.2.3-RELEASE_wasm.artifactbundle.tar.gz \
  --checksum 394040ecd5260e68bb02f6c20aeede733b9b90702c2204e178f3e42413edad2a

swift sdk list

Build Commands

bash
swift build --swift-sdk swift-6.2.3-RELEASE_wasm
swift build --swift-sdk swift-6.2.3-RELEASE_wasm -c release -Xswiftc -Osize

Optimization Commands

bash
swift build \
  --swift-sdk swift-6.2.3-RELEASE_wasm \
  -c release \
  -Xswiftc -Osize \
  -Xswiftc -whole-module-optimization \
  -Xlinker --lto-O3 \
  -Xlinker --gc-sections \
  -Xlinker --strip-debug

Typical Issues

  • "No available targets compatible with wasm32-unknown-wasip1": wrong Swift toolchain or missing WASM SDK
  • large WASM bundle: missing -Osize / LTO / strip
  • stale browser behavior: cached WASM artifact

Working Norms

  • Prefer official swift.org toolchains for reproducible builds.
  • For example apps, build inside each example directory when possible.
  • Confirm output location under .build/wasm32-unknown-wasip1/.

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