TypeScript feature parity: relations, activities, graph traversal, utility tools

lib/typescript/src/activity.ts

@@ -0,0 +1,28 @@
+/**
+ * Activity entity definition and helpers for upjack apps.
+ *
+ * Activities are entities that record events against other entities. They
+ * use the existing CRUD, search, and relationship infrastructure so they
+ * get indexing, querying, and MCP tools for free.
+ *
+ * Opt-in via "activities": true in the manifest's upjack extension.
+ */
+
+import { readFileSync } from "node:fs";
+import { dirname, join } from "node:path";
+import { fileURLToPath } from "node:url";
+import type { EntityDefinition } from "./entity.js";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const SCHEMA_PATH = join(__dirname, "schemas", "activity.schema.json");
+
+export const ACTIVITY_ENTITY_DEF: EntityDefinition = {
+  name: "activity",
+  plural: "activities",
+  prefix: "act",
+  schema: SCHEMA_PATH,
+};
+
+export function getActivitySchema(): Record<string, unknown> {
+  return JSON.parse(readFileSync(SCHEMA_PATH, "utf-8"));
+}