Structured cloning of WebAssembly.Memory is not defined

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#2,155 opened on May 4, 2026 2 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 48/100

Issue type: Feature
Clarity: Mostly clear
Activity status: Quiet
Tech stack: wasm
Domain: api

Research direction

Start with the Web API serialization section linked in the issue and compare its treatment of WebAssembly.Module with browser behavior for WebAssembly.Memory. Check the Web Platform Tests coverage, then define the missing serialization behavior and add tests that cover structured cloning and deserialization.

Written by the indexing model from the issue text.

Description

At least Gecko and WebKit support serializing & deserializing WebAssembly.Memory objects. Yet https://webassembly.github.io/spec/web-api/#serialization only covers WebAssembly.Module.

I also couldn't find test coverage for this on WPT.

Dominant language: WebAssembly
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Forks: 539
Avg merge: 2d 1h
Merged PRs (30d): 13

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