refactor: dedupe plugin runtime stores

src/plugin-sdk/index.ts

@@ -194,6 +194,7 @@ export { buildOauthProviderAuthResult } from "./provider-auth-result.js";
 export { formatResolvedUnresolvedNote } from "./resolution-notes.js";
 export { buildChannelSendResult } from "./channel-send-result.js";
 export type { ChannelSendRawResult } from "./channel-send-result.js";
+export { createPluginRuntimeStore } from "./runtime-store.js";
 export type { ChannelDock } from "../channels/dock.js";
 export { getChatChannelMeta } from "../channels/registry.js";
 export { resolveAllowlistMatchByCandidates } from "../channels/allowlist-match.js";

src/plugin-sdk/runtime-store.ts

@@ -0,0 +1,26 @@
+export function createPluginRuntimeStore<T>(errorMessage: string): {
+  setRuntime: (next: T) => void;
+  clearRuntime: () => void;
+  tryGetRuntime: () => T | null;
+  getRuntime: () => T;
+} {
+  let runtime: T | null = null;
+
+  return {
+    setRuntime(next: T) {
+      runtime = next;
+    },
+    clearRuntime() {
+      runtime = null;
+    },
+    tryGetRuntime() {
+      return runtime;
+    },
+    getRuntime() {
+      if (!runtime) {
+        throw new Error(errorMessage);
+      }
+      return runtime;
+    },
+  };
+}