add deep-partial utility type

index.ts

@@ -5,3 +5,4 @@ export * from './nullables/index.js'
 export * from './raise/index.js'
 export * from './records/index.js'
 export * from './sequences/index.js'
+export * from './types/index.js'

types/DeepPartial.ts

@@ -0,0 +1,28 @@
+/**
+ * Partial<T>, but recursive for records.
+ */
+export type DeepPartial<T> =
+  T extends Record<PropertyKey, unknown>
+    ? { [P in keyof T]?: DeepPartial<T[P]> }
+    : T
+
+/*
+ * Example:
+ *   type Contact = {
+ *     id: string,
+ *     email: string,
+ *     address: {
+ *       street: string
+ *       city: string
+ *     }
+ *   }
+ *
+ *   type Inputs = DeepPartial<Omit<Contact, 'id'>>
+ *   // type: {
+ *        email?: string | undefined
+ *        address?: {
+ *          street?: string | undefined
+ *          city?: string | undefined
+ *        } | undefined
+ *      }
+ */

types/index.ts

@@ -0,0 +1 @@
+export * from './DeepPartial.js'