@tanstack/ai-mcp/dist/esm/events/memory-store.js

Host-side Model Context Protocol client for TanStack AI: discover and run MCP server tools, resources, and prompts in any adapter's chat() loop, with generated end-to-end types.

//#region src/events/memory-store.ts
/**
* In-process event subscription store. For development and tests only.
* Callers receive structured clones, so they cannot mutate stored state.
*
* @experimental
*
* @example
* ```ts
* import { inMemoryMCPEventStore } from '@tanstack/ai-mcp/events'
*
* const store = inMemoryMCPEventStore()
* ```
*/
function inMemoryMCPEventStore() {
	const byKey = /* @__PURE__ */ new Map();
	const byId = /* @__PURE__ */ new Map();
	function index(record) {
		if (typeof record.id === "string") byId.set(record.id, record.key);
	}
	function unindex(record) {
		if (record?.id !== void 0) byId.delete(record.id);
	}
	return {
		async get(key) {
			const stored = byKey.get(key);
			return stored === void 0 ? void 0 : structuredClone(stored);
		},
		async getById(id) {
			const key = byId.get(id);
			if (key === void 0) return void 0;
			const stored = byKey.get(key);
			return stored === void 0 ? void 0 : structuredClone(stored);
		},
		async set(subscription) {
			const previous = byKey.get(subscription.key);
			if (previous?.id !== void 0 && previous.id !== subscription.id) byId.delete(previous.id);
			const stored = structuredClone(subscription);
			byKey.set(stored.key, stored);
			index(stored);
		},
		async update(key, patch) {
			const stored = byKey.get(key);
			if (stored === void 0) return;
			if (patch.id !== void 0 && stored.id !== void 0 && patch.id !== stored.id) byId.delete(stored.id);
			Object.assign(stored, patch);
			index(stored);
		},
		async delete(key) {
			unindex(byKey.get(key));
			byKey.delete(key);
		},
		async *list() {
			for (const stored of byKey.values()) yield structuredClone(stored);
		}
	};
}
//#endregion
export { inMemoryMCPEventStore };

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