release: WRNexusJS 0.6.0

packages/csr/src/outputs.ts

@@ -0,0 +1,39 @@
+export type OutputHandler<T = unknown> = (payload: T) => void | Promise<void>;
+export interface OutputHost extends HTMLElement {
+  __wrnexusOutputHandlers?: Map<string, Set<OutputHandler>>;
+}
+
+export function registerOutputHandler<T>(
+  host: OutputHost,
+  name: string,
+  handler: OutputHandler<T>,
+): () => void {
+  const registry = (host.__wrnexusOutputHandlers ??= new Map());
+  const handlers = registry.get(name) ?? new Set();
+  handlers.add(handler as OutputHandler);
+  registry.set(name, handlers);
+  return () => {
+    handlers.delete(handler as OutputHandler);
+    if (!handlers.size) registry.delete(name);
+  };
+}
+
+export async function invokeOutput<T>(host: OutputHost, name: string, payload?: T): Promise<void> {
+  const handlers = host.__wrnexusOutputHandlers?.get(name);
+  if (handlers?.size) {
+    for (const handler of handlers) await handler(payload);
+    return;
+  }
+  // Compatibility path for legacy listeners outside a hydrated WRN parent.
+  host.dispatchEvent(new CustomEvent(name, { detail: payload }));
+  host.dispatchEvent(new CustomEvent(`wrnexus:${name}`, { detail: payload }));
+}
+
+export function createOutputProxy<T extends Record<string, (...args: any[]) => void>>(
+  host: OutputHost,
+): T {
+  return new Proxy({} as T, {
+    get: (_target, property) => (payload?: unknown) =>
+      invokeOutput(host, String(property), payload),
+  });
+}