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[browser] single file JavaScript and custom loader #89510

@elringus

Description

@elringus

Description

I'm attempting to run browser-wasm with a minimal custom config under .NET 8:

import { dotnet } from './dotnet.js'

const config = {
    "mainAssemblyName": "Test.dll",
    "assemblyRootFolder": "managed",
    "assets": [
	    {
	      "behavior": "dotnetwasm",
	      "name": "dotnet.native.wasm",
	    },
	    {
	      "behavior": "js-module-native",
	      "name": "dotnet.native.js",
	    },
	    {
	      "behavior": "js-module-dotnet",
	      "name": "dotnet.js",
	    },
	    {
	      "behavior": "js-module-runtime",
	      "name": "dotnet.runtime.js",
	    },
	    {
	      "behavior": "assembly",
	      "name": "System.Console.wasm",
	    },
	    {
	      "behavior": "assembly",
	      "name": "System.Linq.wasm",
	    },
	    {
	      "behavior": "assembly",
	      "name": "System.Private.CoreLib.wasm",
	    },
	    {
	      "behavior": "assembly",
	      "name": "Test.wasm",
	    }
    ]
};
const runtime = await dotnet.withConfig(config).create();

But getting nullref here: https://github.com/dotnet/runtime/blob/v8.0.0-preview.6.23329.7/src/mono/wasm/runtime/loader/assets.ts#L145C28

It worked in .NET 7 fine before.

Reproduction Steps

Publish browser-wasm and try running it with a custom config under "AppBundle" dir.

Full repro project with steps: https://github.com/Elringus/JSInteropTest

Expected behavior

No errors.

Actual behavior

Error in mono_download_assets: TypeError: pendingDownloadInternal is null

Regression?

Yes, it worked in .NET 7.

Known Workarounds

None.

Configuration

.NET v8.0.0-preview.6.23329.7
Windows 10
Local http server under AppBundle dir with serve under powershell.

Other information

No response

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