feat: add SDK function for creating node from application and version

packages/sdk/src/create.ts

@@ -6,6 +6,17 @@ import { CreateWakuNodeOptions, WakuNode, WakuOptions } from "./waku.js";
 
 export { Libp2pComponents };
 
+export async function createApplicationNode(
+  application: string,
+  version: string,
+  options?: ProtocolCreateOptions &
+    Partial<WakuOptions> &
+    Partial<RelayCreateOptions>
+): Promise<LightNode> {
+  options = options ?? {};
+  options.shardInfo = { application, version };
+  return createNode(options);
+}
 /**
  * Create a Waku node configured to use autosharding or static sharding.
  */

packages/tests/tests/sdk/application_version.spec.ts

@@ -0,0 +1,21 @@
+import { createApplicationNode, WakuNode } from "@waku/sdk";
+import {
+  contentTopicToPubsubTopic,
+  ensureValidContentTopic
+} from "@waku/utils";
+import { expect } from "chai";
+
+describe("SDK: Creating by Application and Version", function () {
+  const ContentTopic = "/myapp/1/latest/proto";
+
+  it("given an application and version, creates a waku node with the correct pubsub topic", async function () {
+    const contentTopic = ensureValidContentTopic(ContentTopic);
+    const waku = await createApplicationNode(
+      contentTopic.application,
+      contentTopic.version
+    );
+    const expectedPubsubTopic = contentTopicToPubsubTopic(ContentTopic);
+
+    expect((waku as WakuNode).pubsubTopics).to.include(expectedPubsubTopic);
+  });
+});