Encapsulating WeakMap Private Metadata Registries within Svelte Component Context Contracts

import { setContext, getContext } from 'svelte';
 
const PRIVATE_REGISTRY_KEY = Symbol('PrivateRegistryKey');
const metadataRegistry = new WeakMap();
 
export function initPrivateContext(ownerToken, initialData) {
  metadataRegistry.set(ownerToken, initialData);
  setContext(PRIVATE_REGISTRY_KEY, ownerToken);
}
 
export function usePrivateContext(key) {
  const ownerToken = getContext(PRIVATE_REGISTRY_KEY);
  if (!ownerToken) return undefined;
  const metadata = metadataRegistry.get(ownerToken);
  return metadata ? metadata[key] : undefined;
}