B2B-88: add starter kit structure and elements

packages/cms/keystatic/src/create-keystatic-cms.ts

@@ -0,0 +1,37 @@
+import { CmsClient } from '@kit/cms-types';
+
+/**
+ * Creates a new Keystatic client instance.
+ */
+export async function createKeystaticClient() {
+  if (
+    process.env.NEXT_RUNTIME === 'nodejs' ||
+    process.env.KEYSTATIC_STORAGE_KIND !== 'local'
+  ) {
+    const { createKeystaticClient: createClient } = await import(
+      './keystatic-client'
+    );
+
+    return createClient();
+  }
+
+  console.error(
+    `[CMS] Keystatic client using "Local" mode is only available in Node.js runtime. Please choose a different CMS client. Returning a mock client instead of throwing an error.`,
+  );
+
+  return mockCMSClient() as unknown as CmsClient;
+}
+
+function mockCMSClient() {
+  return {
+    getContentItems() {
+      return Promise.resolve({
+        items: [],
+        total: 0,
+      });
+    },
+    getContentItemBySlug() {
+      return Promise.resolve(undefined);
+    },
+  };
+}