refactor(v2): convert synchronous file write to asynchronous (#2936)

* perf(v2): convert synchronous filewrite to asynchronous in feed file generate

This looks like should return a Promise list , other than a sync io operation

* perf(v2): convert synchronous filewrite to asynchronous in sitemap generate

* perf(v2): convert  Promise style to async/await style

for consistency

packages/docusaurus-plugin-content-blog/src/index.ts

@@ -441,15 +441,15 @@ export default function pluginContentBlog(
  const feedTypes = getFeedTypes(options.feedOptions?.type);
 
  await Promise.all(
- feedTypes.map((feedType) => {
+ feedTypes.map(async (feedType) => {
  const feedPath = path.join(
  outDir,
  options.routeBasePath,
  `${feedType}.xml`,
  );
  const feedContent = feedType === 'rss' ? feed.rss2() : feed.atom1();
  try {
- fs.writeFileSync(feedPath, feedContent);
+ await fs.outputFile(feedPath, feedContent);
  } catch (err) {
  throw new Error(`Generating ${feedType} feed failed: ${err}`);
  }

packages/docusaurus-plugin-sitemap/src/index.ts

@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import fs from 'fs';
+import fs from 'fs-extra';
 import path from 'path';
 import {PluginOptions} from './types';
 import createSitemap from './createSitemap';
@@ -37,7 +37,7 @@ export default function pluginSitemap(
  // Write sitemap file.
  const sitemapPath = path.join(outDir, 'sitemap.xml');
  try {
- fs.writeFileSync(sitemapPath, generatedSitemap);
+ await fs.outputFile(sitemapPath, generatedSitemap);
  } catch (err) {
  throw new Error(`Sitemap error: ${err}`);
  }