Return {path,id,stat} from Resolver.prototype.resolve.

The id property is an absolute module identifer, suitable for passing to a
native Node require function.

tools/isobuild/compiler-plugin.js

@@ -349,7 +349,7 @@ class InputFile extends buildPluginModule.InputFile {
     const resolver = batch.getResolver();
 
     return this._resolveCacheStore(
-      id, parentPath, resolver.resolve(id, parentPath).path);
+      id, parentPath, resolver.resolve(id, parentPath).id);
   }
 
   require(id, parentPath) {

tools/isobuild/resolver.js

@@ -12,6 +12,8 @@ import {
   pathNormalize,
   pathDirname,
   statOrNull as realStatOrNull,
+  convertToOSPath,
+  convertToPosixPath,
 } from "../fs/files.js";
 
 const nativeModulesMap = Object.create(null);
@@ -108,6 +110,13 @@ export default class Resolver {
       resolved = this._joinAndStat(dirPath, "index.js");
     }
 
+    if (resolved) {
+      resolved.id = convertToPosixPath(
+        convertToOSPath(resolved.path),
+        true
+      );
+    }
+
     return resolved;
   }