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> 1. Spidermonkey.wasm is the basis of Fastly's JavaScript on Compute@Edge support.

How difficult is staying up to date with SpiderMonkey's latest or pre-release upstream versions? Do have to maintain your own SpiderMonkey patches to make upstream work for you?

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We worked with Igalia to upstream the SpiderMonkey patches required to build for wasm32-wasi. We point to a fixed version (see: https://github.com/fastly/spidermonkey-wasi-embedding) which we haven't updated for a minute.

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