Merge pull request #27428 from software-mansion-labs/ts-migration/kow…

…czarz/app-state-monitor

[No QA][TS migration] Migrate 'AppStateMonitor' lib to TypeScript

src/libs/AppStateMonitor/index.js → src/libs/AppStateMonitor/index.ts

@@ -1,20 +1,15 @@
-import {AppState} from 'react-native';
+import {AppState, AppStateStatus} from 'react-native';
 import CONST from '../../CONST';
 import shouldReportActivity from './shouldReportActivity';
 
-let appState = CONST.APP_STATE.ACTIVE;
+let appState: AppStateStatus = CONST.APP_STATE.ACTIVE;
 
 /**
  * Listener that will only fire the callback when the user has become active.
- *
- * @param {Function} callback
- * @returns {Function} to unsubscribe
+ * @returns callback to unsubscribe
  */
-function addBecameActiveListener(callback) {
-    /**
-     * @param {String} state
-     */
-    function appStateChangeCallback(state) {
+function addBecameActiveListener(callback: () => void): () => void {
+    function appStateChangeCallback(state: AppStateStatus) {
         if (shouldReportActivity && (appState === CONST.APP_STATE.INACTIVE || appState === CONST.APP_STATE.BACKGROUND) && state === CONST.APP_STATE.ACTIVE) {
             callback();
         }

src/libs/AppStateMonitor/shouldReportActivity/index.native.ts

@@ -0,0 +1,5 @@
+import ShouldReportActivity from './types';
+
+const shouldReportActivity: ShouldReportActivity = true;
+
+export default shouldReportActivity;

src/libs/AppStateMonitor/shouldReportActivity/index.js → src/libs/AppStateMonitor/shouldReportActivity/index.ts

@@ -1,4 +1,8 @@
+import ShouldReportActivity from './types';
+
 // We only need to report when the app becomes active on native since web maintains most of it's network functions while
 // in the "background" and the concept is not quite the same on mobile. We avoid setting this to true for web since
 // the event would fire much more frequently than it does on native causing performance issues.
-export default false;
+const shouldReportActivity: ShouldReportActivity = false;
+
+export default shouldReportActivity;

src/libs/AppStateMonitor/shouldReportActivity/types.ts

@@ -0,0 +1,3 @@
+type ShouldReportActivity = boolean;
+
+export default ShouldReportActivity;