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webassembly-component-development

스타21

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업데이트2026년 5월 22일 16:54

Comprehensive guide to WebAssembly component development covering WASI fundamentals, component composition patterns, language interoperability, runtime compatibility, and troubleshooting. Use this skill when building WebAssembly components, writing or editing WIT (WebAssembly Interface Types) definitions, composing components with wac or wasm-tools, targeting wasip1/wasip2/wasip3, working with `.wit` or `.wasm` files, or whenever the user mentions WASI, the component model, wkg, wstd, or component composition.

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cosmonic-labs

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WebAssembly Component Development

This skill provides comprehensive expertise in developing WebAssembly components, including WASI fundamentals, composition patterns, runtime compatibility, and troubleshooting.

Key Defaults

Build: Use wash build when the project has .wash/config.yaml. Use wash build --skip-fetch for plugins (since wasmcloud:wash interface isn't published). Otherwise cargo build --target wasm32-wasip2 --release.
Target: wasm32-wasip2 (Rust 1.82+ tier-2 target). WASI 0.2 (wasip2) is the current standard.
Async: Pick one — tokio 1.50+ with RUSTFLAGS="--cfg tokio_unstable", or wstd (lighter, Wasm-native). Do not mix.
Strings: Always UTF-8 on wasip2. Avoid as_encoded_bytes().
Threading: Unsupported. Design single-threaded. Avoid rayon, threaded tokio, std::thread::spawn.
wasmCloud docs: Always use https://wasmcloud.com/docs/ — never /docs/v1/.

Reference Files

Load the relevant file when working on the matching topic:

Topic	File
Component Model fundamentals, benefits, WASI (wasip2) basics	core-concepts.md
Composition patterns (simple dependency, adapter, middleware, facade), boundary design, building with `wash build` / `cargo`, `wac`, `.wash/config.yaml`	composition-and-building.md
Cross-language composition, supported languages (Rust, Python, JS/TS, Go, C/C++, C#), data type / performance / error handling considerations	language-interop.md
WASI gotchas (no threading, UTF-8 string assumptions, network capabilities), unknown-import errors, runtime-specific compatibility (wasmtime flags, wasmCloud), version alignment strategies	gotchas-and-runtime.md
Async with `tokio` on wasip2, `wstd` (Wasm-native async stdlib), when to choose which	async.md
Testing (host harness, mocks, wash integration, feature flags, env setup), debugging workflow, common error patterns, `wasm-tools`/`wash inspect`, performance (minimize cross-component calls, streaming, batching)	testing-debugging-performance.md
Documentation links, development/component-design/runtime-compat best practices, CI/CD examples, common architecture patterns (microservices, plugin, data pipeline)	patterns-and-best-practices.md

Summary

Component Model enables language-agnostic, composable WebAssembly applications
WASI 0.2 (wasip2) is the current standard with full networking and UTF-8 guarantees
Design coarse-grained interfaces for better performance
Test in target runtime early and often
Use wash build for wasmCloud projects — handles compatibility automatically
Document runtime requirements and maintain compatibility matrices

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name	webassembly-component-development
description	Comprehensive guide to WebAssembly component development covering WASI fundamentals, component composition patterns, language interoperability, runtime compatibility, and troubleshooting. Use this skill when building WebAssembly components, writing or editing WIT (WebAssembly Interface Types) definitions, composing components with wac or wasm-tools, targeting wasip1/wasip2/wasip3, working with `.wit` or `.wasm` files, or whenever the user mentions WASI, the component model, wkg, wstd, or component composition.
license	Apache-2.0

WebAssembly Component Development

This skill provides comprehensive expertise in developing WebAssembly components, including WASI fundamentals, composition patterns, runtime compatibility, and troubleshooting.

Key Defaults

Build: Use wash build when the project has .wash/config.yaml. Use wash build --skip-fetch for plugins (since wasmcloud:wash interface isn't published). Otherwise cargo build --target wasm32-wasip2 --release.
Target: wasm32-wasip2 (Rust 1.82+ tier-2 target). WASI 0.2 (wasip2) is the current standard.
Async: Pick one — tokio 1.50+ with RUSTFLAGS="--cfg tokio_unstable", or wstd (lighter, Wasm-native). Do not mix.
Strings: Always UTF-8 on wasip2. Avoid as_encoded_bytes().
Threading: Unsupported. Design single-threaded. Avoid rayon, threaded tokio, std::thread::spawn.
wasmCloud docs: Always use https://wasmcloud.com/docs/ — never /docs/v1/.

Reference Files

Load the relevant file when working on the matching topic:

Topic	File
Component Model fundamentals, benefits, WASI (wasip2) basics	core-concepts.md
Composition patterns (simple dependency, adapter, middleware, facade), boundary design, building with `wash build` / `cargo`, `wac`, `.wash/config.yaml`	composition-and-building.md
Cross-language composition, supported languages (Rust, Python, JS/TS, Go, C/C++, C#), data type / performance / error handling considerations	language-interop.md
WASI gotchas (no threading, UTF-8 string assumptions, network capabilities), unknown-import errors, runtime-specific compatibility (wasmtime flags, wasmCloud), version alignment strategies	gotchas-and-runtime.md
Async with `tokio` on wasip2, `wstd` (Wasm-native async stdlib), when to choose which	async.md
Testing (host harness, mocks, wash integration, feature flags, env setup), debugging workflow, common error patterns, `wasm-tools`/`wash inspect`, performance (minimize cross-component calls, streaming, batching)	testing-debugging-performance.md
Documentation links, development/component-design/runtime-compat best practices, CI/CD examples, common architecture patterns (microservices, plugin, data pipeline)	patterns-and-best-practices.md

Summary

Component Model enables language-agnostic, composable WebAssembly applications
WASI 0.2 (wasip2) is the current standard with full networking and UTF-8 guarantees
Design coarse-grained interfaces for better performance
Test in target runtime early and often
Use wash build for wasmCloud projects — handles compatibility automatically
Document runtime requirements and maintain compatibility matrices