Files F2: Convert android_app_list_model to TS

Bug: b:289003444
Change-Id: I431baf9e5e52747ecc40f33d07b15287f8688ee1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5086348
Commit-Queue: Jeremie Boulic <jboulic@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1233220}

diff --git a/ui/file_manager/file_manager/foreground/js/android_app_list_model.js b/ui/file_manager/file_manager/foreground/js/android_app_list_model.js
deleted file mode 100644
index feffc2f7..0000000
--- a/ui/file_manager/file_manager/foreground/js/android_app_list_model.js
+++ /dev/null

@@ -1,65 +0,0 @@
-// Copyright 2019 The Chromium Authors
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-import {NativeEventTarget as EventTarget} from 'chrome://resources/ash/common/event_target.js';
-
-import {addAndroidApps} from '../../state/ducks/android_apps.js';
-import {getStore} from '../../state/store.js';
-
-/**
- * Model for managing a list of Android apps.
- */
-export class AndroidAppListModel extends EventTarget {
-  /**
-   * @param {boolean} showAndroidPickerApps Whether to show picker apps in file
-   *     selector.
-   * @param {boolean} includeAllFiles Corresponds to LaunchParam.includeAllFiles
-   * @param {!Array<!Object>} typeList Corresponds to LaunchParam.typeList
-   */
-  constructor(showAndroidPickerApps, includeAllFiles, typeList) {
-    super();
-
-    /** @private @type {!Array<!chrome.fileManagerPrivate.AndroidApp>} */
-    this.apps_ = [];
-
-    if (!showAndroidPickerApps) {
-      return;
-    }
-
-    // @ts-ignore: error TS7034: Variable 'extensions' implicitly has type
-    // 'any[]' in some locations where its type cannot be determined.
-    let extensions = [];
-    if (!includeAllFiles) {
-      for (let i = 0; i < typeList.length; i++) {
-        // @ts-ignore: error TS2339: Property 'extensions' does not exist on
-        // type 'Object'.
-        extensions = extensions.concat(typeList[i].extensions);
-      }
-    }
-
-    chrome.fileManagerPrivate.getAndroidPickerApps(extensions, apps => {
-      this.apps_ = apps;
-      getStore().dispatch(addAndroidApps({apps}));
-      this.dispatchEvent(new CustomEvent('permuted'));
-    });
-  }
-
-  /**
-   * @return {number} Number of picker apps.
-   */
-  length() {
-    return this.apps_.length;
-  }
-
-  /**
-   * @param {number} index Index of the picker app to be retrieved.
-   * @return {chrome.fileManagerPrivate.AndroidApp} The value of the |index|-th
-   *     picker app.
-   */
-  item(index) {
-    // @ts-ignore: error TS2322: Type 'AndroidApp | undefined' is not assignable
-    // to type 'AndroidApp'.
-    return this.apps_[index];
-  }
-}

diff --git a/ui/file_manager/file_manager/foreground/js/android_app_list_model.ts b/ui/file_manager/file_manager/foreground/js/android_app_list_model.ts
new file mode 100644
index 0000000..6de2f05
--- /dev/null
+++ b/ui/file_manager/file_manager/foreground/js/android_app_list_model.ts

@@ -0,0 +1,60 @@
+// Copyright 2019 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import {NativeEventTarget as EventTarget} from 'chrome://resources/ash/common/event_target.js';
+
+import type {TypeList} from '../../common/js/files_app_state.js';
+import {addAndroidApps} from '../../state/ducks/android_apps.js';
+import {getStore} from '../../state/store.js';
+
+/**
+ * Model for managing a list of Android apps.
+ */
+export class AndroidAppListModel extends EventTarget {
+  private apps_: chrome.fileManagerPrivate.AndroidApp[] = [];
+  /**
+   * @param showAndroidPickerApps Whether to show picker apps in file
+   *     selector.
+   * @param includeAllFiles Corresponds to LaunchParam.includeAllFiles
+   * @param typeList Corresponds to LaunchParam.typeList
+   */
+  constructor(
+      showAndroidPickerApps: boolean, includeAllFiles: boolean,
+      typeList: TypeList[]) {
+    super();
+
+    if (!showAndroidPickerApps) {
+      return;
+    }
+
+    let extensions: string[] = [];
+    if (!includeAllFiles) {
+      for (const type of typeList) {
+        extensions = extensions.concat(type.extensions);
+      }
+    }
+
+    chrome.fileManagerPrivate.getAndroidPickerApps(extensions, apps => {
+      this.apps_ = apps;
+      getStore().dispatch(addAndroidApps({apps}));
+      this.dispatchEvent(new CustomEvent('permuted'));
+    });
+  }
+
+  /**
+   * @return Number of picker apps.
+   */
+  length(): number {
+    return this.apps_.length;
+  }
+
+  /**
+   * @param index Index of the picker app to be retrieved.
+   * @return The value of the |index|-th
+   *     picker app.
+   */
+  item(index: number): chrome.fileManagerPrivate.AndroidApp|undefined {
+    return this.apps_[index];
+  }
+}

diff --git a/ui/file_manager/file_manager/foreground/js/navigation_list_model.js b/ui/file_manager/file_manager/foreground/js/navigation_list_model.js
index edc7e5a..84cc104 100644
--- a/ui/file_manager/file_manager/foreground/js/navigation_list_model.js
+++ b/ui/file_manager/file_manager/foreground/js/navigation_list_model.js

@@ -347,7 +347,9 @@
 
     this.androidAppList_ = [];
     for (let i = 0; i < this.androidAppListModel_.length(); i++) {
-      this.androidAppList_.push(this.androidAppListModel_.item(i));
+      this.androidAppList_.push(
+          /** @type {chrome.fileManagerPrivate.AndroidApp} */ (
+              this.androidAppListModel_.item(i)));
     }
 
     // Reorder volumes, shortcuts, and optional items for initial display.

diff --git a/ui/file_manager/file_names.gni b/ui/file_manager/file_names.gni
index a41fdaa..cfae43a 100644
--- a/ui/file_manager/file_names.gni
+++ b/ui/file_manager/file_names.gni

@@ -40,7 +40,6 @@
   "file_manager/externs/ts/store.js",
 
   # Files app Foreground:
-  "file_manager/foreground/js/android_app_list_model.js",
   "file_manager/foreground/js/app_state_controller.js",
   "file_manager/foreground/js/constants.js",
   "file_manager/foreground/js/crostini_controller.js",
@@ -287,6 +286,7 @@
   # Foreground.
   "file_manager/foreground/js/actions_model.ts",
   "file_manager/foreground/js/actions_controller.ts",
+  "file_manager/foreground/js/android_app_list_model.ts",
   "file_manager/foreground/js/banner_controller.ts",
   "file_manager/foreground/js/crossover_search_utils.ts",
   "file_manager/foreground/js/dialog_action_controller.ts",