refactor: improve type safety (#155)

* Fix to make it type safe.

* The build is failing, fix it.

src/types/config.ts

@@ -1,4 +1,4 @@
-import type { LIGHT_MODE, DARK_MODE, AUTO_MODE } from '@constants/constants'
+import type { AUTO_MODE, DARK_MODE, LIGHT_MODE } from '@constants/constants'
 
 export type SiteConfig = {
   title: string
@@ -67,3 +67,18 @@ export type LIGHT_DARK_MODE =
   | typeof LIGHT_MODE
   | typeof DARK_MODE
   | typeof AUTO_MODE
+
+export type BlogPostData = {
+  body: string
+  title: string
+  published: Date
+  description: string
+  tags: string[]
+  draft?: boolean
+  image?: string
+  category?: string
+  prevTitle?: string
+  prevSlug?: string
+  nextTitle?: string
+  nextSlug?: string
+}