Change WASM plugin to return the instance object and not only the exported methods

[hetsch]

Clear and concise description of the problem

I'm currently using the WASM plugin and need to have access to the WASM instance object itself, not only to the exported methods.

vite/packages/vite/src/node/plugins/wasm.ts

Line 40 in a44f480

return result.instance.exports

I have to agree that in the majority of usecases returning the exports might be more convenient, but for people that need more control (in my case a custom wrapper around the exported methods), returning the instance object provides more options for customizations.

Suggested solution

Instead of return result.instance.exports using return result.instance

Alternative

What I have done so far is making a copy of packages/vite/src/node/plugins/wasm.ts, changing return result.instance.exports to return result.instance and registering a custom plugin via

plugins: [
  vue(),
  {
    ...customWASMPlugin(),
    enforce: "pre",
  },
],

That has worked until lately. The original file uses the fileToUrl method

vite/packages/vite/src/node/plugins/wasm.ts

Line 3 in a44f480

import { fileToUrl } from './asset'

vite/packages/vite/src/node/plugins/wasm.ts

Line 64 in a44f480

const url = await fileToUrl(id, config, this)

which is - as far as I know - not exported and therefore not available to custom plugins.
In short, import { fileToUrl, Plugin, ResolvedConfig } from "vite"; in my custom WASM Plugin throws an error that the fileToUrl method is not exported. I again could make a copy of that method and all the methods it invokes ... but that's no fun at all.

Additional context

No response

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