[mobx-task] Fixed property decorator definition (#34851)

* [mobx-task] Fixed property decorator definition

* Revert "[mobx-task] Fixed property decorator definition"

This reverts commit 20bd533e

* test for decorators & last change

* [mobx-task] Fixed property decorator definition

types/mobx-task/index.d.ts

@@ -45,7 +45,8 @@ export interface TaskStatusAware<Result = any, Args extends any[] = any[]> exten
 export interface TaskCreator<K extends keyof TaskOptions<any>> extends MethodDecorator, PropertyDecorator {
     <R, A extends any[]>(func: TaskFunc<R, A>, options?: Pick<TaskOptions<WithoutPromise<R>>, K>): TaskStatusAware<WithoutPromise<R>, A>;
 
-    (options: Pick<TaskOptions<WithoutPromise<any>>, K>): PropertyDecorator | MethodDecorator;
+    (options: Pick<TaskOptions<WithoutPromise<any>>, K>): PropertyDecorator;
+    (options: Pick<TaskOptions<WithoutPromise<any>>, K>): MethodDecorator;
 }
 
 export interface TaskFactory extends TaskCreator<keyof TaskOptions<any>> {

types/mobx-task/mobx-task-tests.ts

@@ -23,6 +23,13 @@ task1.match({
     rejected: error => error.message,
 });
 
+// $ExpectType string | number
+task1.match({
+    resolved: res => 1,
+    pending: (txt, num) => txt,
+    rejected: error => error.message,
+});
+
 // wrap
 const task2 = task(func);
 const task2ToString = task2.wrap(inner => {
@@ -36,3 +43,13 @@ task2ToString.result; // $ExpectType string | undefined
 const task3 = task(func, { result: 1, state: 'resolved' });
 task3.setState({ result: 2, state: 'pending' });
 task3.setState({ result: '2', state: 'pending' }); // $ExpectError
+
+class TestClass {
+    @task fieldWithArrowFn = () => {};
+    @task({ swallow: true }) fieldWithArrowFn2 = () => {};
+    fieldWithArrowFn3 = task(() => {}, { swallow: true });
+
+    @task method() {}
+
+    @task({ swallow: true }) method2() {}
+}

types/mobx-task/tsconfig.json

@@ -8,6 +8,7 @@
         "noImplicitThis": true,
         "strictNullChecks": true,
         "strictFunctionTypes": true,
+        "experimentalDecorators": true,
         "baseUrl": "../",
         "typeRoots": [
             "../"