feat: local and preview detection

apps/website/src/util/fetchSitemap.ts

@@ -0,0 +1,26 @@
+import { readFile } from 'node:fs/promises';
+import { join } from 'node:path';
+import { ENV } from './env';
+
+export async function fetchSitemap({
+	packageName,
+	version,
+}: {
+	readonly packageName: string;
+	readonly version: string;
+}) {
+	if (ENV.IS_LOCAL_DEV) {
+		const fileContent = await readFile(
+			join(process.cwd(), `../../packages/${packageName}/docs/split/${version}.sitemap.api.json`),
+			'utf8',
+		);
+		return JSON.parse(fileContent);
+	}
+
+	const isMainVersion = version === 'main';
+	const fileContent = await fetch(
+		`${process.env.BLOB_STORAGE_URL}/rewrite/${packageName}/${version}.sitemap.api.json`,
+		{ next: isMainVersion ? { revalidate: 0 } : { revalidate: 604_800 } },
+	);
+	return fileContent.json();
+}