fix: remove lit-specific code which is unneeded after a previous fix

Author: calebdwilliams

Diff for: src/element-internals.ts

@@ -11,7 +11,6 @@ import {
 import {
   createHiddenInput,
   findParentForm,
-  getHostRoot,
   initRef,
   overrideFormMethod,
   removeHiddenInputs,
@@ -127,7 +126,7 @@ export class ElementInternals implements IElementInternals {
     const ref = refMap.get(this);
     throwIfNotFormAssociated(ref, `Failed to read the 'labels' property from 'ElementInternals': The target element is not a form-associated custom element.`);
     const id = ref.getAttribute('id');
-    const hostRoot = getHostRoot(ref);
+    const hostRoot = ref.getRootNode() as Element;
     if (hostRoot && id) {
       return hostRoot ? hostRoot.querySelectorAll(`[for=${id}]`) : [];
     }

Diff for: src/index.ts

@@ -1,6 +1,6 @@
 import { ElementInternals } from './element-internals';
-import './element-internals';
 import { CustomStateSet } from './CustomStateSet';
+import './element-internals';
 export * from './types';
 
 declare global {

Diff for: src/types.ts

@@ -75,8 +75,4 @@ export interface ICustomElement extends HTMLElement {
   disabled?: boolean;
 }
 
-export interface ILitElement extends ICustomElement {
-  updateComplete: Promise<void>;
-}
-
 export type LabelsList = NodeListOf<HTMLLabelElement> | [];

Diff for: src/utils.ts

@@ -1,5 +1,5 @@
-import { hiddenInputMap, formsMap, formElementsMap, internalsMap, documentFragmentMap } from './maps.js';
-import { ICustomElement, IElementInternals, ILitElement, LabelsList } from './types.js';
+import { hiddenInputMap, formsMap, formElementsMap, internalsMap } from './maps.js';
+import { ICustomElement, IElementInternals, LabelsList } from './types.js';
 
 const observerConfig: MutationObserverInit = { attributes: true, attributeFilter: ['disabled'] };
 
@@ -15,18 +15,6 @@ const observer = new MutationObserver((mutationsList: MutationRecord[]) => {
   }
 });
 
-/** Recursively get the host root */
-export const getHostRoot = (node: Node): Node&ParentNode => {
-  if (node instanceof Document) {
-    return node;
-  }
-  let parent = node.parentNode;
-  if (parent && parent.toString() !== '[object ShadowRoot]') {
-    parent = getHostRoot(parent);
-  }
-  return parent;
-};
-
 /**
  * Removes all hidden inputs for the given element internals instance
  * @param {IElementInternals} internals - The element internals instance
@@ -46,15 +34,11 @@ export const removeHiddenInputs = (internals: IElementInternals): void => {
  * @param {IElementInternals} internals - The element internals instance for the ref
  * @return {HTMLInputElement} The hidden input
  */
-export const createHiddenInput = (ref: ICustomElement | ILitElement, internals: IElementInternals): HTMLInputElement | null => {
+export const createHiddenInput = (ref: ICustomElement, internals: IElementInternals): HTMLInputElement | null => {
   const input = document.createElement('input');
   input.type = 'hidden';
   input.name = ref.getAttribute('name');
-  if ((<ILitElement>ref).updateComplete) {
-    (<ILitElement>ref).updateComplete.then(() => ref.after(input));
-  } else {
-    ref.after(input);
-  }
+  ref.after(input);
   hiddenInputMap.get(internals).push(input);
   return input;
 }