refactor: improve type safety (#155)

* Fix to make it type safe.

* The build is failing, fix it.

src/pages/archive/tag/[tag].astro

@@ -1,27 +1,27 @@
 ---
-import { getSortedPosts } from '@utils/content-utils'
-import MainGridLayout from '@layouts/MainGridLayout.astro'
 import ArchivePanel from '@components/ArchivePanel.astro'
-import { i18n } from '@i18n/translation'
 import I18nKey from '@i18n/i18nKey'
+import { i18n } from '@i18n/translation'
+import MainGridLayout from '@layouts/MainGridLayout.astro'
+import { getSortedPosts } from '@utils/content-utils'
 
 export async function getStaticPaths() {
-  let posts = await getSortedPosts()
+  const posts = await getSortedPosts()
 
-  const allTags = posts.reduce((acc, post) => {
+  // タグを集めるための Set の型を指定
+  const allTags = posts.reduce<Set<string>>((acc, post) => {
+    // biome-ignore lint/complexity/noForEach: <explanation>
     post.data.tags.forEach(tag => acc.add(tag))
     return acc
   }, new Set())
 
   const allTagsArray = Array.from(allTags)
 
-  return allTagsArray.map(tag => {
-    return {
-      params: {
-        tag: tag,
-      },
-    }
-  })
+  return allTagsArray.map(tag => ({
+    params: {
+      tag: tag,
+    },
+  }))
 }
 
 const tag = Astro.params.tag as string
@@ -29,4 +29,4 @@ const tag = Astro.params.tag as string
 
 <MainGridLayout title={i18n(I18nKey.archive)} description={i18n(I18nKey.archive)}>
     <ArchivePanel tags={[tag]}></ArchivePanel>
-</MainGridLayout>
+</MainGridLayout>

src/pages/rss.xml.ts

@@ -1,25 +1,31 @@
-import rss from '@astrojs/rss'
 import { siteConfig } from '@/config'
-import sanitizeHtml from 'sanitize-html'
+import rss from '@astrojs/rss'
+import { getSortedPosts } from '@utils/content-utils'
+import type { APIContext } from 'astro'
 import MarkdownIt from 'markdown-it'
-import { getSortedPosts } from '@utils/content-utils.ts'
+import sanitizeHtml from 'sanitize-html'
+
 const parser = new MarkdownIt()
 
-export async function GET(context: any) {
+export async function GET(context: APIContext) {
   const blog = await getSortedPosts()
+
   return rss({
     title: siteConfig.title,
     description: siteConfig.subtitle || 'No description',
-    site: context.site,
-    items: blog.map(post => ({
-      title: post.data.title,
-      pubDate: post.data.published,
-      description: post.data.description,
-      link: `/posts/${post.slug}/`,
-      content: sanitizeHtml(parser.render(post.body), {
-        allowedTags: sanitizeHtml.defaults.allowedTags.concat(['img']),
-      }),
-    })),
+    site: context.site ?? 'https://fuwari.vercel.app',
+    items: blog.map(post => {
+      const body = typeof post.data.body === 'string' ? post.data.body : ''
+      return {
+        title: post.data.title,
+        pubDate: post.data.published,
+        description: post.data.description || '',
+        link: `/posts/${post.slug}/`,
+        content: sanitizeHtml(parser.render(body), {
+          allowedTags: sanitizeHtml.defaults.allowedTags.concat(['img']),
+        }),
+      }
+    }),
     customData: `<language>${siteConfig.lang}</language>`,
   })
 }