Rust WebAssembly module in an ES module wrapper from wasm-pack fails to load in Next.js

### What version of Next.js are you using? 11.1.2 ### What version of Node.js are you using? 14.17.6 ### What browser are you using? Firefox, Chrome ### What operating system are you using? macOS ### How are you deploying your application? Not yet deployed ### Describe the Bug A simple Rust WebAssembly module packaged with its glue code into an ES module with wasm-pack (patched as in https://github.com/rustwasm/wasm-pack/pull/1061) loads and works just fine under webpack, as illustrated in https://github.com/webpack/webpack/pull/14313, but fails to import under Next.js. This is apparently because Next.js generates the `.wasm` generated at one path but then tries to load it from a different path. ### Expected Behavior I expected the `npm run dev` to successfully run the application and render a page with the greeting from inside the WebAssembly module. I expected `npm run build` to successfully build a production distribution that would do the same. ### To Reproduce This is demonstrated in https://github.com/gthb/try-to-use-wasm-in-next.js/ — the README there recounts my circuitous path of trying to get this to work, but [the current state] serves to illustrate the problem I'm reporting here. [the current state]: https://github.com/gthb/try-to-use-wasm-in-next.js/tree/038198128768b480cef30e0505a6c8c2544d3aa8 In that repo, first setup: ``` yarn install yarn run build-wasm # or just copy the `pkg` from https://github.com/webpack/webpack/pull/14313 into `hi-wasm/pkg` yarn run link-wasm ``` Then try `yarn run dev` — it fails like this: ``` yarn run v1.22.11 $ next dev ready - started server on 0.0.0.0:3000, url: http://localhost:3000 info - Using webpack 5. Reason: Enabled by default https://nextjs.org/docs/messages/webpack5 warn - You have enabled experimental feature(s). warn - Experimental features are not covered by semver, and may cause unexpected or broken application behavior. Use them at your own risk. event - compiled successfully event - build page: /next/di…