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If you are using a fairly new version of chrome any wasm should indeed show up under sources, under a special wasm domain. It looks like this https://webassemblycode.com/wp-content/uploads/Chrome-Wasm-D...

It doesn't show the source file because the browser is not actually aware of where the js on the page got the wasm its running from. From the browser's perspective it just fetched an opaque file and then separately got told to run some wasm.

You can see the actual source file for the wasm for one of the demos here, it still shows up in the network tab (but for example if the js on the page generated the wasm then it wouldn't). https://webassembly.z19.web.core.windows.net/mono.wasm

You already cannot get anything usefull out from minified JavaScript.

It's there, if you look at the Network tab in the Dev Tools you will find the mono.wasm binary.