Add Workers Emscripten Instructions and Gotchas #23945
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I spent two days figuring out how to get Emscripten WASM modules working in PartyKit, assembled from old Discord messages and abandoned example repos with out-dated WASM import mechanisms. The instructions here represent the cleanest and most useful way to get Emscripten modules working in Cloudflare Workers and Durable Objects.
zalo
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GregBrimble,
WalshyDev,
irvinebroque,
kodster28,
korinne and
mikenomitch
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irvinebroque,
kodster28,
korinne,
mikenomitch and
WalshyDev
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Pull Request Overview
This PR adds documentation for using Emscripten-compiled WebAssembly modules in Cloudflare Workers. The documentation addresses specific compilation flags and instantiation patterns needed to work around Workers' runtime limitations.
Key changes:
- Adds Emscripten-specific compilation flags and requirements
- Provides a code example for proper module instantiation in Workers
- References an example template repository
src/content/docs/workers/runtime-apis/webassembly/javascript.mdx
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src/content/docs/workers/runtime-apis/webassembly/javascript.mdx
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src/content/docs/workers/runtime-apis/webassembly/javascript.mdx
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Add Suggestions from Github Actions Co-authored-by: Copilot <[email protected]>
Switch from async/await to then/catch syntax to be called from the top level.
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Summary
I spent two days figuring out how to get Emscripten WASM modules working in PartyKit, assembled from old Discord messages and abandoned example repos with out-dated WASM import mechanisms.
The instructions here represent the cleanest and most useful way to get Emscripten modules working in Cloudflare Workers and Durable Objects.
This example can be seen in production using an Emscripten compilation of the
manifoldCSG library in a PartyKit server for doing shared multiplayer CSG operations:https://zalo.github.io/WorldParty/
https://github.com/zalo/WorldParty/blob/main/src/server.js#L82-L92
Documentation checklist