build: add a typescript declaration file for MDX

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

2 files changed, 13 insertions, 0 deletions

diff --git a/mdx.d.ts b/mdx.d.ts
new file mode 100644
index 0000000..b77b39d
--- /dev/null
+++ b/mdx.d.ts
@@ -0,0 +1,7 @@
+declare module '*.mdx' {
+  import { Meta } from '@ts/types/app';
+
+  let MDXComponent: (props: any) => JSX.Element;
+  export default MDXComponent;
+  export const meta: Meta;
+}
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;