feat(partial): add support for returning type from partial if passed a type

docs/reference/utilities.md

@@ -92,7 +92,7 @@ partial(
 { name: 'Jane' }
 ```
 
-`partial` allows you to create a new struct based on an existing object struct, but with all of its properties being optional.
+`partial` allows you to create a new struct based on an existing object or type struct, but with all of its properties being optional.
 
 ### `pick`
 

src/structs/utilities.ts

@@ -170,7 +170,7 @@ export function omit<S extends ObjectSchema, K extends keyof S>(
 }
 
 /**
- * Create a new struct based on an existing object struct, but with all of its
+ * Create a new struct based on an existing object or type struct, but with all of its
  * properties allowed to be `undefined`.
  *
  * Like TypeScript's `Partial` utility.
@@ -186,7 +186,7 @@ export function partial<S extends ObjectSchema>(
     schema[key] = optional(schema[key])
   }
 
-  return object(schema) as any
+  return (struct.type === 'type' ? type : object)(schema) as any
 }
 
 /**

src/utils.ts

@@ -277,7 +277,7 @@ export type Optionalize<S extends object> = OmitBy<S, undefined> &
   Partial<PickBy<S, undefined>>
 
 /**
- * Transform an object schema type to represent a partial.
+ * Transform an object or type schema type to represent a partial.
  */
 
 export type PartialObjectSchema<S extends ObjectSchema> = {

test/validation/partial/composed-type.ts

@@ -0,0 +1,18 @@
+import { partial, type, string, number } from '../../..'
+
+export const Struct = partial(
+  type({
+    name: string(),
+    age: number(),
+  })
+)
+
+export const data = {
+  name: 'john',
+  location: 'mars',
+}
+
+export const output = {
+  name: 'john',
+  location: 'mars',
+}