1 files changed, 22 insertions, 7 deletions
diff --git a/ext/js/pages/settings/persistent-storage-controller.js b/ext/js/pages/settings/persistent-storage-controller.js
index aa060c14..e85bfc6b 100644
--- a/ext/js/pages/settings/persistent-storage-controller.js
+++ b/ext/js/pages/settings/persistent-storage-controller.js
@@ -21,22 +21,27 @@ import {yomitan} from '../../yomitan.js';
 
 export class PersistentStorageController {
     constructor() {
-        this._persistentStorageCheckbox = false;
+        /** @type {?HTMLInputElement} */
+        this._persistentStorageCheckbox = null;
     }
 
+    /** */
     async prepare() {
-        this._persistentStorageCheckbox = document.querySelector('#storage-persistent-checkbox');
+        this._persistentStorageCheckbox = /** @type {HTMLInputElement} */ (document.querySelector('#storage-persistent-checkbox'));
         this._persistentStorageCheckbox.addEventListener('change', this._onPersistentStorageCheckboxChange.bind(this), false);
 
         if (!this._isPersistentStorageSupported()) { return; }
 
-        const info = document.querySelector('#storage-persistent-info');
+        const info = /** @type {?HTMLElement} */ (document.querySelector('#storage-persistent-info'));
         if (info !== null) { info.hidden = false; }
 
         const isStoragePeristent = await this.isStoragePeristent();
         this._updateCheckbox(isStoragePeristent);
     }
 
+    /**
+     * @returns {Promise<boolean>}
+     */
     async isStoragePeristent() {
         try {
             return await navigator.storage.persisted();
@@ -48,8 +53,11 @@ export class PersistentStorageController {
 
     // Private
 
+    /**
+     * @param {Event} e
+     */
     _onPersistentStorageCheckboxChange(e) {
-        const node = e.currentTarget;
+        const node = /** @type {HTMLInputElement} */ (e.currentTarget);
         if (node.checked) {
             node.checked = false;
             this._attemptPersistStorage();
@@ -58,6 +66,7 @@ export class PersistentStorageController {
         }
     }
 
+    /** */
     async _attemptPersistStorage() {
         let isStoragePeristent = false;
         try {
@@ -68,18 +77,24 @@ export class PersistentStorageController {
 
         this._updateCheckbox(isStoragePeristent);
 
-        const node = document.querySelector('#storage-persistent-fail-warning');
+        const node = /** @type {?HTMLElement} */ (document.querySelector('#storage-persistent-fail-warning'));
         if (node !== null) { node.hidden = isStoragePeristent; }
 
         yomitan.trigger('storageChanged');
     }
 
+    /**
+     * @returns {boolean}
+     */
     _isPersistentStorageSupported() {
         return isObject(navigator.storage) && typeof navigator.storage.persist === 'function';
     }
 
+    /**
+     * @param {boolean} isStoragePeristent
+     */
     _updateCheckbox(isStoragePeristent) {
-        this._persistentStorageCheckbox.checked = isStoragePeristent;
-        this._persistentStorageCheckbox.readOnly = isStoragePeristent;
+        /** @type {HTMLInputElement} */ (this._persistentStorageCheckbox).checked = isStoragePeristent;
+        /** @type {HTMLInputElement} */ (this._persistentStorageCheckbox).readOnly = isStoragePeristent;
     }
 }