feat: add utility-types

Author: Ohh-889

primitives/type-utils/src/fn.ts

@@ -12,7 +12,11 @@ export type Noop = () => void;
  *   d: (x: number) => string;
  *   e?: () => void;     // optional also can be recognized
  * }
- * type FooFnTypes  = FunctionUnion<Foo>;  // (() => void) | ((x:number)=>string) | (()=>void)
+ * type FooFnTypes = {
+ *   c: () => void;
+ *   d: (x: number) => string;
+ *   e?: (() => void) | undefined;
+   }
  */
 export type OnlyFunctions<T> = {
   [K in keyof T as NonNullable<T[K]> extends Fn ? K : never]: T[K];
@@ -26,7 +30,7 @@ export type OnlyFunctions<T> = {
  *   b?: string;
  *   c(): void;
  *   d: (x: number) => string;
- *   e?: () => void;     // 可选也能识别
+ *   e?: () => void;
  * }
  * type FooFnKeys  = FunctionKeys<Foo>;  // 'c' | 'd' | 'e'
  */
@@ -42,7 +46,7 @@ export type FunctionKeys<T> = {
  *   b?: string;
  *   c(): void;
  *   d: (x: number) => string;
- *   e?: () => void;     // 可选也能识别
+ *   e?: () => void;
  * }
  * type FooFnTypes  = FunctionUnion<Foo>;  // (() => void) | ((x:number)=>string) | (()=>void)
  */

primitives/type-utils/src/index.ts

@@ -2,4 +2,6 @@ export * from './fn';
 
 export * from './form';
 
+export * from './utility-types';
+
 export * from './utils';

primitives/type-utils/src/utility-types.ts

@@ -0,0 +1,17 @@
+/**
+ * DeepPartial<T>
+ * @example
+ * type User = {
+ *   name: string;
+ *   age: number;
+ *   address: {
+ *     city: string;
+ *     street: string;
+ *   };
+ * };
+ * type PartialUser = DeepPartial<User>;
+ * // => { name?: string; age?: number; address?: { city?: string; street?: string } }
+ */
+export type DeepPartial<T> = {
+  [K in keyof T]?: T[K] extends object ? (T[K] extends (...args: any[]) => any ? T[K] : DeepPartial<T[K]>) : T[K];
+};