build: add a typescript declaration file for MDX

I need to inform Typescript than I am exporting a meta constant from
MDX files.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/ts/types/app.ts b/src/ts/types/app.ts
index e1d8917..a8c552d 100644
--- a/src/ts/types/app.ts
+++ b/src/ts/types/app.ts
@@ -83,6 +83,12 @@ export type Heading = {
   title: string;
 };
 
+export type Meta = {
+  title: string;
+  publishedOn: string;
+  updatedOn: string;
+};
+
 export type PageInfo = {
   endCursor: string;
   hasNextPage: boolean;