2 files changed, 6 insertions, 0 deletions
diff --git a/src/types/generics.ts b/src/types/generics.ts
new file mode 100644
index 0000000..5377c54
--- /dev/null
+++ b/src/types/generics.ts
@@ -0,0 +1,5 @@
+export type Maybe<T> = T | undefined;
+
+export type Nullable<T> = T | null;
+
+export type DataValidator<T> = (data: T) => boolean | Promise<boolean>;
diff --git a/src/types/index.ts b/src/types/index.ts
index c9820db..e2f0f55 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -1,4 +1,5 @@
 export * from './app';
+export * from './generics';
 export * from './graphql';
 export * from './mdx';
 export * from './raw-data';