feat: add Owner.document shallow property

The document property can be used to store document instances other than window.document. This property is copied to child owners and computations.

packages/solid/src/reactive/signal.ts

@@ -88,6 +88,7 @@ export interface Owner {
   context: any | null;
   sourceMap?: SourceMapValue[];
   name?: string;
+  document?: Document;
 }
 
 export interface Computation<Init, Next extends Init = Init> extends Owner {
@@ -148,7 +149,8 @@ export function createRoot<T>(fn: RootFunction<T>, detachedOwner?: typeof Owner)
           owned: null,
           cleanups: null,
           context: null,
-          owner: detachedOwner === undefined ? owner : detachedOwner
+          owner: detachedOwner === undefined ? owner : detachedOwner,
+          document: detachedOwner?.document ?? owner?.document
         },
     updateFn = unowned
       ? "_SOLID_DEV_"
@@ -1397,6 +1399,7 @@ function createComputation<Next, Init = unknown>(
     cleanups: null,
     value: init,
     owner: Owner,
+    document: Owner?.document,
     context: null,
     pure
   };