refact: extract duplicated File/Folder types

src/types/index.d.ts

@@ -0,0 +1,32 @@
+export interface IFile {
+  title: string
+  type: "file"
+  path: string
+}
+
+export interface IFolder {
+  title: string
+  type: "folder"
+  path: string
+  children: IFileOrFolder[]
+}
+
+export type IFileOrFolder = IFile | IFolder
+
+export interface IFileQuery {
+  node: {
+    relativePath: string
+    childMarkdownRemark: {
+      frontmatter: {
+        author: string
+        date: string
+      }
+    }
+  }
+}
+
+export interface IAllResourcesQuery {
+  allFile: {
+    edges: IFileQuery[]
+  }
+}