feat: add SyncFn and SyncFnWithThis to type utilities

Author: GoodbyeNJN

src/types/fn.d.ts

@@ -17,3 +17,14 @@ export type AsyncFnWithThis<Return = any, Args extends readonly any[] = any[], T
 ) => Promise<Return>) & {
     prototype: This;
 };
+
+export type SyncFn<Return = any, Args extends readonly any[] = any[]> = (
+    ...args: Args
+) => Return extends Promise<any> ? never : Return;
+
+export type SyncFnWithThis<Return = any, Args extends readonly any[] = any[], This = unknown> = ((
+    this: This,
+    ...args: Args
+) => Return extends Promise<any> ? never : Return) & {
+    prototype: This;
+};

src/types/global-types.d.ts

@@ -63,6 +63,12 @@ declare global {
         Args extends readonly any[] = any[],
         This = unknown,
     > = Types.FnWithThis<Return, Args, This>;
+    type SyncFn<Return = any, Args extends readonly any[] = any[]> = Types.SyncFn<Return, Args>;
+    type SyncFnWithThis<
+        Return = any,
+        Args extends readonly any[] = any[],
+        This = unknown,
+    > = Types.SyncFnWithThis<Return, Args, This>;
 
     type Entries<BaseType> = Types.Entries<BaseType>;
     type Entry<BaseType> = Types.Entry<BaseType>;

src/types/index.ts

@@ -1,4 +1,4 @@
-export type { AsyncFn, AsyncFnWithThis, Fn, FnWithThis } from "./fn";
+export type { AsyncFn, AsyncFnWithThis, Fn, FnWithThis, SyncFn, SyncFnWithThis } from "./fn";
 export type { Nullable } from "./nullable";
 export type { OmitByKey } from "./omit-by-key";
 export type { YieldType } from "./yield-type";