1 files changed, 25 insertions, 0 deletions
diff --git a/content-system/registry/singleton.ts b/content-system/registry/singleton.ts
new file mode 100644
index 0000000..d8a556e
--- /dev/null
+++ b/content-system/registry/singleton.ts
@@ -0,0 +1,25 @@
+import type { ContentRegistry } from '@hollowdark/content-system/registry/registry'
+
+let instance: ContentRegistry | null = null
+
+/** Record the registry populated during session startup. */
+export function setContentRegistry(registry: ContentRegistry): void {
+  instance = registry
+}
+
+/**
+ * Access the shared content registry. Throws if called before the
+ * loading pipeline has populated it — simulation code should never run
+ * until initial load is complete.
+ */
+export function getContentRegistry(): ContentRegistry {
+  if (instance === null) {
+    throw new Error('Content registry not initialised. Initial load must complete first.')
+  }
+  return instance
+}
+
+/** True once the registry has been populated. */
+export function hasContentRegistry(): boolean {
+  return instance !== null
+}