change to getter

src/service/index.ts

@@ -47,7 +47,7 @@ export class ServiceState {
    * Check if state is `loading`.
    * @returns in `loading` state or not.
    */
-  isLoading(): boolean {
+  get loading(): boolean {
     return this.state == 'loading';
   }
 
@@ -55,7 +55,7 @@ export class ServiceState {
    * Check if state is `success`.
    * @returns in `success state or not.
    */
-  isSuccess(): boolean {
+  get success(): boolean {
     return this.state == 'success';
   }
 
@@ -63,7 +63,7 @@ export class ServiceState {
    * Check if state is `failed`.
    * @returns in `failed` state or not.
    */
-  isFailed(): boolean {
+  get failed(): boolean {
     return this.state == 'failed';
   }
 }