Summary

Track WASI Preview 2 implementation in wasd using the same execution-ordered issue roadmap style as Preview1, but with component-model foundations first and package capabilities layered on top.

Current repo state:

• README.md currently marks Preview 2 as not implemented.
• lib/src/wasm/backend/native/interpreter/module.dart still notes that component-model binary format support is not implemented yet.
• Preview 2 cannot reuse node:wasi; node support must be implemented through JS interop host adapters for each package capability.

Execution rules:

• Each capability issue is expected to bring its own focused tests.
• The checklist below is already sorted by dependency order; reading it top-to-bottom is the intended implementation path.
• The Blocked by notes explain why a later item is placed where it is; if you follow the checklist order, you should not need extra dependency triage.

References

• Preview2 overview: https://github.com/WebAssembly/WASI/blob/main/docs/Preview2.md
• Component-model WIT: https://github.com/WebAssembly/component-model/blob/c7176a512c0bbe4654849f4ba221c1a71c7cf514/design/mvp/WIT.md
• Component-model binary: https://github.com/WebAssembly/component-model/blob/c7176a512c0bbe4654849f4ba221c1a71c7cf514/design/mvp/Binary.md
• Component-model Canonical ABI: https://github.com/WebAssembly/component-model/blob/c7176a512c0bbe4654849f4ba221c1a71c7cf514/design/mvp/CanonicalABI.md
• Component-model linking: https://github.com/WebAssembly/component-model/blob/c7176a512c0bbe4654849f4ba221c1a71c7cf514/design/mvp/Linking.md

Execution Order

Phase 1: Component Foundations

• Implement component-model binary decoding and validation required for WASI Preview 2 #56 Implement component-model binary decoding and validation required for WASI Preview 2. Refs: https://github.com/WebAssembly/WASI/blob/main/docs/Preview2.md , https://github.com/WebAssembly/component-model/blob/c7176a512c0bbe4654849f4ba221c1a71c7cf514/design/mvp/Binary.md , https://github.com/WebAssembly/component-model/blob/c7176a512c0bbe4654849f4ba221c1a71c7cf514/design/mvp/Explainer.md
• Implement Canonical ABI value lifting and lowering required for WASI Preview 2 #57 Implement Canonical ABI value lifting and lowering required for WASI Preview 2. Refs: https://github.com/WebAssembly/WASI/blob/main/docs/Preview2.md , https://github.com/WebAssembly/component-model/blob/c7176a512c0bbe4654849f4ba221c1a71c7cf514/design/mvp/WIT.md , https://github.com/WebAssembly/component-model/blob/c7176a512c0bbe4654849f4ba221c1a71c7cf514/design/mvp/CanonicalABI.md Blocked by: Implement component-model binary decoding and validation required for WASI Preview 2 #56
• Implement resource handle tables and lifecycle semantics required for WASI Preview 2 #58 Implement resource handle tables and lifecycle semantics required for WASI Preview 2. Refs: https://github.com/WebAssembly/WASI/blob/main/docs/Preview2.md , https://github.com/WebAssembly/component-model/blob/c7176a512c0bbe4654849f4ba221c1a71c7cf514/design/mvp/Explainer.md , https://github.com/WebAssembly/component-model/blob/c7176a512c0bbe4654849f4ba221c1a71c7cf514/design/mvp/CanonicalABI.md Blocked by: Implement Canonical ABI value lifting and lowering required for WASI Preview 2 #57
• Implement component instantiation and WIT world linking required for WASI Preview 2 #59 Implement component instantiation and WIT world linking required for WASI Preview 2. Refs: https://github.com/WebAssembly/WASI/blob/main/docs/Preview2.md , https://github.com/WebAssembly/component-model/blob/c7176a512c0bbe4654849f4ba221c1a71c7cf514/design/mvp/Linking.md , https://github.com/WebAssembly/component-model/blob/c7176a512c0bbe4654849f4ba221c1a71c7cf514/design/mvp/WIT.md , https://github.com/WebAssembly/component-model/blob/c7176a512c0bbe4654849f4ba221c1a71c7cf514/design/mvp/Explainer.md Blocked by: Implement component-model binary decoding and validation required for WASI Preview 2 #56, Implement resource handle tables and lifecycle semantics required for WASI Preview 2 #58
• Add Preview 2 host binding scaffolding for native, web, and node backends #60 Add Preview 2 host binding scaffolding for native, web, and node backends. Refs: https://github.com/WebAssembly/WASI/blob/main/docs/Preview2.md , https://github.com/WebAssembly/component-model/blob/c7176a512c0bbe4654849f4ba221c1a71c7cf514/design/mvp/WIT.md , https://github.com/WebAssembly/wasi-io/blob/v0.2.8/imports.md Blocked by: Implement component instantiation and WIT world linking required for WASI Preview 2 #59

Phase 2: Base WASI Packages

• Implement wasi:[email protected] for WASI Preview 2 #61 Implement wasi:[email protected] for WASI Preview 2. Refs: https://github.com/WebAssembly/WASI/blob/main/docs/Preview2.md , https://github.com/WebAssembly/wasi-io/tree/v0.2.8 , https://github.com/WebAssembly/wasi-io/blob/v0.2.8/imports.md , https://github.com/WebAssembly/wasi-io/blob/v0.2.8/wit/world.wit , https://github.com/WebAssembly/wasi-io/blob/v0.2.8/wit/error.wit , https://github.com/WebAssembly/wasi-io/blob/v0.2.8/wit/poll.wit , https://github.com/WebAssembly/wasi-io/blob/v0.2.8/wit/streams.wit Blocked by: Add Preview 2 host binding scaffolding for native, web, and node backends #60
• Implement wasi:[email protected] for WASI Preview 2 #62 Implement wasi:[email protected] for WASI Preview 2. Refs: https://github.com/WebAssembly/WASI/blob/main/docs/Preview2.md , https://github.com/WebAssembly/wasi-clocks/tree/v0.2.8 , https://github.com/WebAssembly/wasi-clocks/blob/v0.2.8/imports.md , https://github.com/WebAssembly/wasi-clocks/blob/v0.2.8/wit/world.wit , https://github.com/WebAssembly/wasi-clocks/blob/v0.2.8/wit/monotonic-clock.wit , https://github.com/WebAssembly/wasi-clocks/blob/v0.2.8/wit/wall-clock.wit , https://github.com/WebAssembly/wasi-clocks/blob/v0.2.8/wit/timezone.wit Blocked by: Implement wasi:[email protected] for WASI Preview 2 #61
• Implement wasi:[email protected] for WASI Preview 2 #63 Implement wasi:[email protected] for WASI Preview 2. Refs: https://github.com/WebAssembly/WASI/blob/main/docs/Preview2.md , https://github.com/WebAssembly/wasi-random/tree/v0.2.8 , https://github.com/WebAssembly/wasi-random/blob/v0.2.8/imports.md , https://github.com/WebAssembly/wasi-random/blob/v0.2.8/wit/world.wit , https://github.com/WebAssembly/wasi-random/blob/v0.2.8/wit/random.wit , https://github.com/WebAssembly/wasi-random/blob/v0.2.8/wit/insecure.wit , https://github.com/WebAssembly/wasi-random/blob/v0.2.8/wit/insecure-seed.wit Blocked by: Add Preview 2 host binding scaffolding for native, web, and node backends #60
• Implement wasi:[email protected] for WASI Preview 2 #64 Implement wasi:[email protected] for WASI Preview 2. Refs: https://github.com/WebAssembly/WASI/blob/main/docs/Preview2.md , https://github.com/WebAssembly/wasi-filesystem/tree/v0.2.8 , https://github.com/WebAssembly/wasi-filesystem/blob/v0.2.8/imports.md , https://github.com/WebAssembly/wasi-filesystem/blob/v0.2.8/path-resolution.md , https://github.com/WebAssembly/wasi-filesystem/blob/v0.2.8/wit/world.wit , https://github.com/WebAssembly/wasi-filesystem/blob/v0.2.8/wit/types.wit , https://github.com/WebAssembly/wasi-filesystem/blob/v0.2.8/wit/preopens.wit Blocked by: Implement wasi:[email protected] for WASI Preview 2 #61, Implement wasi:[email protected] for WASI Preview 2 #62
• Implement wasi:[email protected] for WASI Preview 2 #65 Implement wasi:[email protected] for WASI Preview 2. Refs: https://github.com/WebAssembly/WASI/blob/main/docs/Preview2.md , https://github.com/WebAssembly/wasi-sockets/tree/v0.2.8 , https://github.com/WebAssembly/wasi-sockets/blob/v0.2.8/imports.md , https://github.com/WebAssembly/wasi-sockets/blob/v0.2.8/TcpSocketOperationalSemantics.md , https://github.com/WebAssembly/wasi-sockets/blob/v0.2.8/wit/world.wit , https://github.com/WebAssembly/wasi-sockets/blob/v0.2.8/wit/network.wit , https://github.com/WebAssembly/wasi-sockets/blob/v0.2.8/wit/tcp.wit , https://github.com/WebAssembly/wasi-sockets/blob/v0.2.8/wit/udp.wit Blocked by: Implement wasi:[email protected] for WASI Preview 2 #61, Implement wasi:[email protected] for WASI Preview 2 #62
• Implement wasi:[email protected] command support for WASI Preview 2 #66 Implement wasi:[email protected] command support for WASI Preview 2. Refs: https://github.com/WebAssembly/WASI/blob/main/docs/Preview2.md , https://github.com/WebAssembly/wasi-cli/tree/v0.2.8 , https://github.com/WebAssembly/wasi-cli/blob/v0.2.8/README.md , https://github.com/WebAssembly/wasi-cli/blob/v0.2.8/command.md , https://github.com/WebAssembly/wasi-cli/blob/v0.2.8/wit/imports.wit , https://github.com/WebAssembly/wasi-cli/blob/v0.2.8/wit/command.wit , https://github.com/WebAssembly/wasi-cli/blob/v0.2.8/wit/environment.wit , https://github.com/WebAssembly/wasi-cli/blob/v0.2.8/wit/stdio.wit , https://github.com/WebAssembly/wasi-cli/blob/v0.2.8/wit/terminal.wit , https://github.com/WebAssembly/wasi-cli/blob/v0.2.8/wit/exit.wit , https://github.com/WebAssembly/wasi-cli/blob/v0.2.8/wit/run.wit Blocked by: Implement wasi:[email protected] for WASI Preview 2 #61, Implement wasi:[email protected] for WASI Preview 2 #62, Implement wasi:[email protected] for WASI Preview 2 #63, Implement wasi:[email protected] for WASI Preview 2 #64, Implement wasi:[email protected] for WASI Preview 2 #65
• Implement wasi:[email protected] proxy support for WASI Preview 2 #67 Implement wasi:[email protected] proxy support for WASI Preview 2. Refs: https://github.com/WebAssembly/WASI/blob/main/docs/Preview2.md , https://github.com/WebAssembly/wasi-http/tree/v0.2.8 , https://github.com/WebAssembly/wasi-http/blob/v0.2.8/imports.md , https://github.com/WebAssembly/wasi-http/blob/v0.2.8/proxy.md , https://github.com/WebAssembly/wasi-http/blob/v0.2.8/wit/proxy.wit , https://github.com/WebAssembly/wasi-http/blob/v0.2.8/wit/handler.wit , https://github.com/WebAssembly/wasi-http/blob/v0.2.8/wit/types.wit Blocked by: Implement wasi:[email protected] command support for WASI Preview 2 #66

Phase 3: Verification and Documentation

• Add Preview 2 conformance fixtures and selected official suite coverage #68 Add Preview 2 conformance fixtures and selected official suite coverage. Refs: https://github.com/WebAssembly/WASI/blob/main/docs/Preview2.md , https://github.com/WebAssembly/component-model/tree/c7176a512c0bbe4654849f4ba221c1a71c7cf514/test , https://github.com/WebAssembly/wasi-io/tree/v0.2.8/test , https://github.com/WebAssembly/wasi-filesystem/tree/v0.2.8/test , https://github.com/WebAssembly/wasi-http/tree/v0.2.8 Blocked by: Implement wasi:[email protected] proxy support for WASI Preview 2 #67
• Document per-runtime WASI Preview 2 support matrix and update package docs #69 Document per-runtime WASI Preview 2 support matrix and update package docs. Refs: https://github.com/WebAssembly/WASI/blob/main/docs/Preview2.md , https://github.com/WebAssembly/wasi-cli/tree/v0.2.8 , https://github.com/WebAssembly/wasi-http/tree/v0.2.8 Blocked by: Add Preview 2 conformance fixtures and selected official suite coverage #68

Exit Criteria

Close this tracker only when one of these is true:

1. The component-model foundations and the selected Preview2 packages are implemented with tested behavior across the intended runtimes.
2. Any remaining Preview2 exclusions are explicitly documented, and package docs stop implying broader support than the runtime actually provides.