Assign a locateFile to the Module that corrects the prefix

Fix that prefix argument does not indicate the location where the script exists when dotnet.wasm is loaded

src/mono/wasm/runtime/es6/dotnet.es6.pre.js

@@ -18,4 +18,31 @@ else {
     throw new Error("MONO_WASM: Can't use moduleFactory callback of createDotnetRuntime function.")
 }
 var require = require || undefined;
-var __dirname = __dirname || '';
+var __dirname = __dirname || '';
+if (Module["locateFile"] === undefined) {
+    // URL class is undefined on V8(ENVIRONMENT_IS_SHELL)
+    // To bypass assigning wasmBinaryFile variable in https://github.com/emscripten-core/emscripten/blob/4b5c4f0694174e081661944ab3ffdb43dd1949b8/src/preamble.js#L792-L793 ,
+    // pass implementation of locateFile to Module
+    Module["locateFile"] = function(path, prefix) {
+        // Constants for environment are defined later.
+        // https://github.com/emscripten-core/emscripten/blob/ae675c6abdd7e4a73dfc100b7cd258ef0cec01a2/src/shell.js#L93-L111
+        // emcc emits _scriptDir variable top-level, it's initialized by import.meta.url
+        if (ENVIRONMENT_IS_SHELL) {
+            // it's only used when load dotnet.wasm
+            if (prefix === "") {
+                return _scriptDir.slice(0, _scriptDir.lastIndexOf("/")) + "/" + path;
+            }
+            return prefix + path;
+        }
+        if (ENVIRONMENT_IS_NODE) {
+            // it's only used when load dotnet.wasm
+            if (prefix === "/") {
+                const fileExtensionTrimmedScriptDir = _scriptDir.replace(/^file:\/\//, "");
+                return fileExtensionTrimmedScriptDir.slice(0, fileExtensionTrimmedScriptDir.lastIndexOf("/")) + "/" + path;
+            }
+            return prefix + path;
+        }
+
+        return prefix + path;
+    }
+}