sunfishcode / wasi-preview2

WASI Preview2 Proposal

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This repo is collecting and proposing ideas and designs for a WASI concept tentatively called "Preview2", which would be a successor to "wasi_snapshot_preview1", featuring:

  • wit-based tooling
  • full sockets support
  • an improved preopen mechanism
  • static analyzability of environment variables
  • async "ready" (but not actual async execution yet; see below)
  • a design for dlls

This Preview2 iteration would not yet support:

  • Support for linking multiple components together.
  • Full async runtime support.

In return for this reduced scope, Preview2 is something we could plausibly roll out and start upstreaming into upstream toolchains in a shorter timeframe, and if we line everything up right, it'll help set up full async execution support in the future.

The Task List is a running list of the steps to get to Preview2.

The Toolchain Design discusses the overall design.

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WASI Preview2 Proposal