feat: add FallbackIfNever type

joshunrau · joshunrau · commit d29628bc572e · 2025-03-16T11:53:00.000-04:00
diff --git a/src/types.ts b/src/types.ts
@@ -42,3 +42,5 @@ export type SingleKeyMap<K extends PropertyKey, V> =
         }
       : never
     : never;
+
+export type FallbackIfNever<T, U> = [T] extends [never] ? U : T;

Original file line number	Diff line number	Diff line change
`@@ -42,3 +42,5 @@ export type SingleKeyMap<K extends PropertyKey, V> =`
`42`	`42`	`}`
`43`	`43`	`: never`
`44`	`44`	`: never;`
	`45`	`+`
	`46`	`+export type FallbackIfNever<T, U> = [T] extends [never] ? U : T;`