Update eslint spacing rules (#366)

* Add space-infix-ops rule

* Add no-multi-spaces

---------

Co-authored-by: Darius Jahandarie <djahandarie@gmail.com>

46 files changed, 130 insertions, 95 deletions

diff --git a/ext/js/app/frontend.js b/ext/js/app/frontend.js
index e1f8d8c9..a1bbb217 100644
--- a/ext/js/app/frontend.js
+++ b/ext/js/app/frontend.js
@@ -41,9 +41,9 @@ export class Frontend {
         parentPopupId,
         parentFrameId,
         useProxyPopup,
-        canUseWindowPopup=true,
+        canUseWindowPopup = true,
         allowRootFramePopupProxy,
-        childrenSupported=true,
+        childrenSupported = true,
         hotkeyHandler
     }) {
         /** @type {import('frontend').PageType} */
@@ -106,6 +106,7 @@ export class Frontend {
         /** @type {?import('settings').OptionsContext} */
         this._optionsContextOverride = null;
 
+        /* eslint-disable no-multi-spaces */
         /** @type {import('core').MessageHandlerMap} */
         this._runtimeMessageHandlers = new Map(/** @type {import('core').MessageHandlerArray} */ ([
             ['Frontend.requestReadyBroadcast',   {async: false, handler: this._onMessageRequestFrontendReadyBroadcast.bind(this)}],
@@ -117,6 +118,7 @@ export class Frontend {
             ['scanSelectedText', this._onActionScanSelectedText.bind(this)],
             ['scanTextAtCaret',  this._onActionScanTextAtCaret.bind(this)]
         ]);
+        /* eslint-enable no-multi-spaces */
     }
 
     /**
@@ -174,6 +176,7 @@ export class Frontend {
         this._textScanner.on('clear', this._onTextScannerClear.bind(this));
         this._textScanner.on('searched', this._onSearched.bind(this));
 
+        /* eslint-disable no-multi-spaces */
         yomitan.crossFrame.registerHandlers([
             ['Frontend.closePopup',       {async: false, handler: this._onApiClosePopup.bind(this)}],
             ['Frontend.copySelection',    {async: false, handler: this._onApiCopySelection.bind(this)}],
@@ -181,6 +184,7 @@ export class Frontend {
             ['Frontend.getPopupInfo',     {async: false, handler: this._onApiGetPopupInfo.bind(this)}],
             ['Frontend.getPageInfo',      {async: false, handler: this._onApiGetPageInfo.bind(this)}]
         ]);
+        /* eslint-enable no-multi-spaces */
 
         this._prepareSiteSpecific();
         this._updateContentScale();
diff --git a/ext/js/app/popup-factory.js b/ext/js/app/popup-factory.js
index 6fa50796..41984841 100644
--- a/ext/js/app/popup-factory.js
+++ b/ext/js/app/popup-factory.js
@@ -47,6 +47,7 @@ export class PopupFactory {
      */
     prepare() {
         this._frameOffsetForwarder.prepare();
+        /* eslint-disable no-multi-spaces */
         yomitan.crossFrame.registerHandlers([
             ['PopupFactory.getOrCreatePopup',     {async: true,  handler: this._onApiGetOrCreatePopup.bind(this)}],
             ['PopupFactory.setOptionsContext',    {async: true,  handler: this._onApiSetOptionsContext.bind(this)}],
@@ -64,6 +65,7 @@ export class PopupFactory {
             ['PopupFactory.getFrameSize',         {async: true,  handler: this._onApiGetFrameSize.bind(this)}],
             ['PopupFactory.setFrameSize',         {async: true,  handler: this._onApiSetFrameSize.bind(this)}]
         ]);
+        /* eslint-enable no-multi-spaces */
     }
 
     /**
@@ -72,12 +74,12 @@ export class PopupFactory {
      * @returns {Promise<import('popup').PopupAny>}
      */
     async getOrCreatePopup({
-        frameId=null,
-        id=null,
-        parentPopupId=null,
-        depth=null,
-        popupWindow=false,
-        childrenSupported=false
+        frameId = null,
+        id = null,
+        parentPopupId = null,
+        depth = null,
+        popupWindow = false,
+        childrenSupported = false
     }) {
         // Find by existing id
         if (id !== null) {
diff --git a/ext/js/app/popup.js b/ext/js/app/popup.js
index 7419785b..a2aa204a 100644
--- a/ext/js/app/popup.js
+++ b/ext/js/app/popup.js
@@ -718,7 +718,7 @@ export class Popup extends EventDispatcher {
      * @param {string} action
      * @param {import('core').SerializableObject} params
      */
-    _invokeWindow(action, params={}) {
+    _invokeWindow(action, params = {}) {
         const contentWindow = this._frame.contentWindow;
         if (this._frameClient === null || !this._frameClient.isConnected() || contentWindow === null) { return; }
 
diff --git a/ext/js/background/backend.js b/ext/js/background/backend.js
index 3eefed53..749c81a6 100644
--- a/ext/js/background/backend.js
+++ b/ext/js/background/backend.js
@@ -147,6 +147,7 @@ export class Backend {
         /** @type {PermissionsUtil} */
         this._permissionsUtil = new PermissionsUtil();
 
+        /* eslint-disable no-multi-spaces */
         /** @type {import('backend').MessageHandlerMap} */
         this._messageHandlers = new Map(/** @type {import('backend').MessageHandlerMapInit} */ ([
             ['requestBackendReadySignal',    {async: false, contentScript: true,  handler: this._onApiRequestBackendReadySignal.bind(this)}],
@@ -193,6 +194,7 @@ export class Backend {
             ['loadExtensionScripts',         {async: true,  contentScript: true,  handler: this._onApiLoadExtensionScripts.bind(this)}],
             ['openCrossFramePort',           {async: false, contentScript: true,  handler: this._onApiOpenCrossFramePort.bind(this)}]
         ]));
+        /* eslint-enable no-multi-spaces */
         /** @type {import('backend').MessageHandlerWithProgressMap} */
         this._messageHandlersWithProgress = new Map(/** @type {import('backend').MessageHandlerWithProgressMapInit} */ ([
             // Empty
@@ -201,10 +203,10 @@ export class Backend {
         /** @type {Map<string, (params?: import('core').SerializableObject) => void>} */
         this._commandHandlers = new Map(/** @type {[name: string, handler: (params?: import('core').SerializableObject) => void][]} */ ([
             ['toggleTextScanning', this._onCommandToggleTextScanning.bind(this)],
-            ['openInfoPage',       this._onCommandOpenInfoPage.bind(this)],
-            ['openSettingsPage',   this._onCommandOpenSettingsPage.bind(this)],
-            ['openSearchPage',     this._onCommandOpenSearchPage.bind(this)],
-            ['openPopupWindow',    this._onCommandOpenPopupWindow.bind(this)]
+            ['openInfoPage', this._onCommandOpenInfoPage.bind(this)],
+            ['openSettingsPage', this._onCommandOpenSettingsPage.bind(this)],
+            ['openSearchPage', this._onCommandOpenSearchPage.bind(this)],
+            ['openPopupWindow', this._onCommandOpenPopupWindow.bind(this)]
         ]));
     }
 
@@ -805,7 +807,7 @@ export class Backend {
     }
 
     /** @type {import('api').Handler<import('api').GetOrCreateSearchPopupDetails, import('api').GetOrCreateSearchPopupResult>} */
-    async _onApiGetOrCreateSearchPopup({focus=false, text}) {
+    async _onApiGetOrCreateSearchPopup({focus = false, text}) {
         const {tab, created} = await this._getOrCreateSearchPopup();
         if (focus === true || (focus === 'ifCreated' && created)) {
             await this._focusTab(tab);
@@ -1979,7 +1981,7 @@ export class Backend {
      * @param {?number} [timeout=null]
      * @returns {Promise<void>}
      */
-    _waitUntilTabFrameIsReady(tabId, frameId, timeout=null) {
+    _waitUntilTabFrameIsReady(tabId, frameId, timeout = null) {
         return new Promise((resolve, reject) => {
             /** @type {?import('core').Timeout} */
             let timer = null;
diff --git a/ext/js/background/offscreen.js b/ext/js/background/offscreen.js
index 4b57514d..85b6847b 100644
--- a/ext/js/background/offscreen.js
+++ b/ext/js/background/offscreen.js
@@ -50,6 +50,7 @@ export class Offscreen {
             richContentPasteTargetSelector: '#clipboard-rich-content-paste-target'
         });
 
+        /* eslint-disable no-multi-spaces */
         /** @type {import('offscreen').MessageHandlerMap} */
         const messageHandlers = new Map([
             ['clipboardGetTextOffscreen',    {async: true,  handler: this._getTextHandler.bind(this)}],
@@ -65,6 +66,7 @@ export class Offscreen {
             ['getTermFrequenciesOffscreen',  {async: true,  handler: this._getTermFrequenciesHandler.bind(this)}],
             ['clearDatabaseCachesOffscreen', {async: false, handler: this._clearDatabaseCachesHandler.bind(this)}]
         ]);
+        /* eslint-enable no-multi-spaces */
         /** @type {import('offscreen').MessageHandlerMap<string>} */
         this._messageHandlers = messageHandlers;
 
diff --git a/ext/js/background/profile-conditions-util.js b/ext/js/background/profile-conditions-util.js
index ceade070..b1bbe1d5 100644
--- a/ext/js/background/profile-conditions-util.js
+++ b/ext/js/background/profile-conditions-util.js
@@ -34,11 +34,11 @@ export class ProfileConditionsUtil {
                 'popupLevel',
                 {
                     operators: new Map(/** @type {import('profile-conditions-util').OperatorMapArray} */ ([
-                        ['equal',              this._createSchemaPopupLevelEqual.bind(this)],
-                        ['notEqual',           this._createSchemaPopupLevelNotEqual.bind(this)],
-                        ['lessThan',           this._createSchemaPopupLevelLessThan.bind(this)],
-                        ['greaterThan',        this._createSchemaPopupLevelGreaterThan.bind(this)],
-                        ['lessThanOrEqual',    this._createSchemaPopupLevelLessThanOrEqual.bind(this)],
+                        ['equal', this._createSchemaPopupLevelEqual.bind(this)],
+                        ['notEqual', this._createSchemaPopupLevelNotEqual.bind(this)],
+                        ['lessThan', this._createSchemaPopupLevelLessThan.bind(this)],
+                        ['greaterThan', this._createSchemaPopupLevelGreaterThan.bind(this)],
+                        ['lessThanOrEqual', this._createSchemaPopupLevelLessThanOrEqual.bind(this)],
                         ['greaterThanOrEqual', this._createSchemaPopupLevelGreaterThanOrEqual.bind(this)]
                     ]))
                 }
diff --git a/ext/js/comm/anki-connect.js b/ext/js/comm/anki-connect.js
index 7ff8d0e1..bd9a69a2 100644
--- a/ext/js/comm/anki-connect.js
+++ b/ext/js/comm/anki-connect.js
@@ -318,7 +318,7 @@ export class AnkiConnect {
      * @param {?string[]} actions A list of actions to check for
      * @returns {Promise<import('anki').ApiReflectResult>} Information about the APIs.
      */
-    async apiReflect(scopes, actions=null) {
+    async apiReflect(scopes, actions = null) {
         const result = await this._invoke('apiReflect', {scopes, actions});
         if (!(typeof result === 'object' && result !== null)) {
             throw this._createUnexpectedResultError('object', result);
diff --git a/ext/js/comm/api.js b/ext/js/comm/api.js
index 26218595..35a66d9e 100644
--- a/ext/js/comm/api.js
+++ b/ext/js/comm/api.js
@@ -482,7 +482,7 @@ export class API {
      * @param {number} [timeout]
      * @returns {Promise<TReturn>}
      */
-    _invokeWithProgress(action, params, onProgress0, timeout=5000) {
+    _invokeWithProgress(action, params, onProgress0, timeout = 5000) {
         return new Promise((resolve, reject) => {
             /** @type {?chrome.runtime.Port} */
             let port = null;
@@ -554,7 +554,7 @@ export class API {
      * @param {import('core').SerializableObject} [params]
      * @returns {Promise<TReturn>}
      */
-    _invoke(action, params={}) {
+    _invoke(action, params = {}) {
         const data = {action, params};
         return new Promise((resolve, reject) => {
             try {
diff --git a/ext/js/comm/clipboard-reader.js b/ext/js/comm/clipboard-reader.js
index 364e31a3..a6d1c068 100644
--- a/ext/js/comm/clipboard-reader.js
+++ b/ext/js/comm/clipboard-reader.js
@@ -26,7 +26,7 @@ export class ClipboardReader {
      * Creates a new instances of a clipboard reader.
      * @param {{document: ?Document, pasteTargetSelector: ?string, richContentPasteTargetSelector: ?string}} details Details about how to set up the instance.
      */
-    constructor({document=null, pasteTargetSelector=null, richContentPasteTargetSelector=null}) {
+    constructor({document = null, pasteTargetSelector = null, richContentPasteTargetSelector = null}) {
         /** @type {?Document} */
         this._document = document;
         /** @type {?import('environment').Browser} */
diff --git a/ext/js/comm/frame-ancestry-handler.js b/ext/js/comm/frame-ancestry-handler.js
index e4d08f28..b91046bc 100644
--- a/ext/js/comm/frame-ancestry-handler.js
+++ b/ext/js/comm/frame-ancestry-handler.js
@@ -109,7 +109,7 @@ export class FrameAncestryHandler {
      * @param {number} [timeout]
      * @returns {Promise<number[]>}
      */
-    _getFrameAncestryInfo(timeout=5000) {
+    _getFrameAncestryInfo(timeout = 5000) {
         return new Promise((resolve, reject) => {
             const targetWindow = window.parent;
             if (window === targetWindow) {
diff --git a/ext/js/comm/frame-client.js b/ext/js/comm/frame-client.js
index 8aa8c6d6..b07bb796 100644
--- a/ext/js/comm/frame-client.js
+++ b/ext/js/comm/frame-client.js
@@ -41,7 +41,7 @@ export class FrameClient {
      * @param {import('frame-client').SetupFrameFunction} setupFrame
      * @param {number} [timeout]
      */
-    async connect(frame, targetOrigin, hostFrameId, setupFrame, timeout=10000) {
+    async connect(frame, targetOrigin, hostFrameId, setupFrame, timeout = 10000) {
         const {secret, token, frameId} = await this._connectInternal(frame, targetOrigin, hostFrameId, setupFrame, timeout);
         this._secret = secret;
         this._token = token;
diff --git a/ext/js/core.js b/ext/js/core.js
index 14d0ef56..5c0c964b 100644
--- a/ext/js/core.js
+++ b/ext/js/core.js
@@ -600,7 +600,7 @@ export class DynamicProperty extends EventDispatcher {
      * @returns {import('core').TokenString} A string token which can be passed to the clearOverride function
      *   to remove the override.
      */
-    setOverride(value, priority=0) {
+    setOverride(value, priority = 0) {
         const overridesCount = this._overrides.length;
         let i = 0;
         for (; i < overridesCount; ++i) {
@@ -670,7 +670,7 @@ export class Logger extends EventDispatcher {
      *   Other values will be logged at a non-error level.
      * @param {?import('log').LogContext} [context] An optional context object for the error which should typically include a `url` field.
      */
-    log(error, level, context=null) {
+    log(error, level, context = null) {
         if (typeof context !== 'object' || context === null) {
             context = {url: location.href};
         }
@@ -745,7 +745,7 @@ export class Logger extends EventDispatcher {
      * @param {unknown} error The error to log. This is typically an `Error` or `Error`-like object.
      * @param {?import('log').LogContext} context An optional context object for the error which should typically include a `url` field.
      */
-    warn(error, context=null) {
+    warn(error, context = null) {
         this.log(error, 'warn', context);
     }
 
@@ -754,7 +754,7 @@ export class Logger extends EventDispatcher {
      * @param {unknown} error The error to log. This is typically an `Error` or `Error`-like object.
      * @param {?import('log').LogContext} context An optional context object for the error which should typically include a `url` field.
      */
-    error(error, context=null) {
+    error(error, context = null) {
         this.log(error, 'error', context);
     }
 }
diff --git a/ext/js/data/anki-note-builder.js b/ext/js/data/anki-note-builder.js
index 4920db39..864bd2d4 100644
--- a/ext/js/data/anki-note-builder.js
+++ b/ext/js/data/anki-note-builder.js
@@ -51,15 +51,15 @@ export class AnkiNoteBuilder {
         deckName,
         modelName,
         fields,
-        tags=[],
-        requirements=[],
-        checkForDuplicates=true,
-        duplicateScope='collection',
-        duplicateScopeCheckAllModels=false,
-        resultOutputMode='split',
-        glossaryLayoutMode='default',
-        compactTags=false,
-        mediaOptions=null
+        tags = [],
+        requirements = [],
+        checkForDuplicates = true,
+        duplicateScope = 'collection',
+        duplicateScopeCheckAllModels = false,
+        resultOutputMode = 'split',
+        glossaryLayoutMode = 'default',
+        compactTags = false,
+        mediaOptions = null
     }) {
         let duplicateScopeDeckName = null;
         let duplicateScopeCheckChildren = false;
@@ -130,9 +130,9 @@ export class AnkiNoteBuilder {
         dictionaryEntry,
         mode,
         context,
-        resultOutputMode='split',
-        glossaryLayoutMode='default',
-        compactTags=false,
+        resultOutputMode = 'split',
+        glossaryLayoutMode = 'default',
+        compactTags = false,
         marker
     }) {
         const commonData = this._createData(dictionaryEntry, mode, context, resultOutputMode, glossaryLayoutMode, compactTags, void 0);
diff --git a/ext/js/data/database.js b/ext/js/data/database.js
index 026945ca..8b9e7354 100644
--- a/ext/js/data/database.js
+++ b/ext/js/data/database.js
@@ -265,7 +265,7 @@ export class Database {
      * @param {?(completedCount: number, totalCount: number) => void} onProgress
      * @returns {Promise<void>}
      */
-    bulkDelete(objectStoreName, indexName, query, filterKeys=null, onProgress=null) {
+    bulkDelete(objectStoreName, indexName, query, filterKeys = null, onProgress = null) {
         return new Promise((resolve, reject) => {
             const transaction = this._readWriteTransaction([objectStoreName], resolve, reject);
             const objectStore = transaction.objectStore(objectStoreName);
diff --git a/ext/js/data/options-util.js b/ext/js/data/options-util.js
index 70c1622f..c3c0e685 100644
--- a/ext/js/data/options-util.js
+++ b/ext/js/data/options-util.js
@@ -39,7 +39,7 @@ export class OptionsUtil {
      * @param {?number} [targetVersion]
      * @returns {Promise<import('settings').Options>}
      */
-    async update(optionsInput, targetVersion=null) {
+    async update(optionsInput, targetVersion = null) {
         // Invalid options
         let options = /** @type {{[key: string]: unknown}} */ (
             typeof optionsInput === 'object' && optionsInput !== null && !Array.isArray(optionsInput) ?
@@ -530,6 +530,7 @@ export class OptionsUtil {
      * @returns {import('options-util').ModernUpdate[]}
      */
     _getVersionUpdates(targetVersion) {
+        /* eslint-disable no-multi-spaces */
         const result = [
             {async: false, update: this._updateVersion1.bind(this)},
             {async: false, update: this._updateVersion2.bind(this)},
@@ -553,6 +554,7 @@ export class OptionsUtil {
             {async: false, update: this._updateVersion20.bind(this)},
             {async: true,  update: this._updateVersion21.bind(this)}
         ];
+        /* eslint-enable no-multi-spaces */
         if (typeof targetVersion === 'number' && targetVersion < result.length) {
             result.splice(targetVersion);
         }
@@ -818,6 +820,7 @@ export class OptionsUtil {
             };
             delete profile.options.anki.sentenceExt;
             profile.options.general.popupActionBarLocation = 'top';
+            /* eslint-disable no-multi-spaces */
             profile.options.inputs = {
                 hotkeys: [
                     {action: 'close',             key: 'Escape',    modifiers: [],       scopes: ['popup'], enabled: true},
@@ -838,6 +841,7 @@ export class OptionsUtil {
                     {action: 'copyHostSelection', key: 'KeyC',      modifiers: ['ctrl'], scopes: ['popup'], enabled: true}
                 ]
             };
+            /* eslint-enable no-multi-spaces */
             profile.options.anki.suspendNewCards = false;
             profile.options.popupWindow = {
                 width: profile.options.general.popupWidth,
diff --git a/ext/js/display/display-anki.js b/ext/js/display/display-anki.js
index 81791285..322237da 100644
--- a/ext/js/display/display-anki.js
+++ b/ext/js/display/display-anki.js
@@ -108,12 +108,14 @@ export class DisplayAnki {
     /** */
     prepare() {
         this._noteContext = this._getNoteContext();
+        /* eslint-disable no-multi-spaces */
         this._display.hotkeyHandler.registerActions([
             ['addNoteKanji',      () => { this._tryAddAnkiNoteForSelectedEntry('kanji'); }],
             ['addNoteTermKanji',  () => { this._tryAddAnkiNoteForSelectedEntry('term-kanji'); }],
             ['addNoteTermKana',   () => { this._tryAddAnkiNoteForSelectedEntry('term-kana'); }],
             ['viewNote',          this._viewNoteForSelectedEntry.bind(this)]
         ]);
+        /* eslint-enable no-multi-spaces */
         this._display.on('optionsUpdated', this._onOptionsUpdated.bind(this));
         this._display.on('contentClear', this._onContentClear.bind(this));
         this._display.on('contentUpdateStart', this._onContentUpdateStart.bind(this));
diff --git a/ext/js/display/display-audio.js b/ext/js/display/display-audio.js
index 1f279030..8cd1ccc3 100644
--- a/ext/js/display/display-audio.js
+++ b/ext/js/display/display-audio.js
@@ -83,6 +83,7 @@ export class DisplayAudio {
     /** */
     prepare() {
         this._audioSystem.prepare();
+        /* eslint-disable no-multi-spaces */
         this._display.hotkeyHandler.registerActions([
             ['playAudio',           this._onHotkeyActionPlayAudio.bind(this)],
             ['playAudioFromSource', this._onHotkeyActionPlayAudioFromSource.bind(this)]
@@ -90,6 +91,7 @@ export class DisplayAudio {
         this._display.registerDirectMessageHandlers([
             ['Display.clearAutoPlayTimer', {async: false, handler: this._onMessageClearAutoPlayTimer.bind(this)}]
         ]);
+        /* eslint-enable no-multi-spaces */
         this._display.on('optionsUpdated', this._onOptionsUpdated.bind(this));
         this._display.on('contentClear', this._onContentClear.bind(this));
         this._display.on('contentUpdateEntry', this._onContentUpdateEntry.bind(this));
@@ -120,7 +122,7 @@ export class DisplayAudio {
      * @param {number} headwordIndex
      * @param {?string} [sourceType]
      */
-    async playAudio(dictionaryEntryIndex, headwordIndex, sourceType=null) {
+    async playAudio(dictionaryEntryIndex, headwordIndex, sourceType = null) {
         let sources = this._audioSources;
         if (sourceType !== null) {
             sources = [];
diff --git a/ext/js/display/display-generator.js b/ext/js/display/display-generator.js
index eb464001..7bedfa12 100644
--- a/ext/js/display/display-generator.js
+++ b/ext/js/display/display-generator.js
@@ -28,7 +28,7 @@ export class DisplayGenerator {
     /**
      * @param {import('display').DisplayGeneratorConstructorDetails} details
      */
-    constructor({japaneseUtil, contentManager, hotkeyHelpController=null}) {
+    constructor({japaneseUtil, contentManager, hotkeyHelpController = null}) {
         /** @type {import('../language/sandbox/japanese-util.js').JapaneseUtil} */
         this._japaneseUtil = japaneseUtil;
         /** @type {import('./display-content-manager.js').DisplayContentManager} */
diff --git a/ext/js/display/display-history.js b/ext/js/display/display-history.js
index f9d2e35d..af6d734e 100644
--- a/ext/js/display/display-history.js
+++ b/ext/js/display/display-history.js
@@ -25,7 +25,7 @@ export class DisplayHistory extends EventDispatcher {
     /**
      * @param {{clearable?: boolean, useBrowserHistory?: boolean}} details
      */
-    constructor({clearable=true, useBrowserHistory=false}) {
+    constructor({clearable = true, useBrowserHistory = false}) {
         super();
         /** @type {boolean} */
         this._clearable = clearable;
diff --git a/ext/js/display/display-notification.js b/ext/js/display/display-notification.js
index a0e9e35c..df475adf 100644
--- a/ext/js/display/display-notification.js
+++ b/ext/js/display/display-notification.js
@@ -67,7 +67,7 @@ export class DisplayNotification {
     /**
      * @param {boolean} [animate]
      */
-    close(animate=false) {
+    close(animate = false) {
         if (this.isClosed()) { return; }
 
         if (animate) {
diff --git a/ext/js/display/display.js b/ext/js/display/display.js
index b6a818ba..945ec0b9 100644
--- a/ext/js/display/display.js
+++ b/ext/js/display/display.js
@@ -196,6 +196,7 @@ export class Display extends EventDispatcher {
         /** @type {ThemeController} */
         this._themeController = new ThemeController(document.documentElement);
 
+        /* eslint-disable no-multi-spaces */
         this._hotkeyHandler.registerActions([
             ['close',             () => { this._onHotkeyClose(); }],
             ['nextEntry',         this._onHotkeyActionMoveRelative.bind(this, 1)],
@@ -219,6 +220,7 @@ export class Display extends EventDispatcher {
         this.registerWindowMessageHandlers([
             ['Display.extensionUnloaded', {async: false, handler: this._onMessageExtensionUnloaded.bind(this)}]
         ]);
+        /* eslint-enable no-multi-spaces */
     }
 
     /** @type {DisplayGenerator} */
@@ -586,7 +588,7 @@ export class Display extends EventDispatcher {
      * @param {import('core').SerializableObject} [params]
      * @returns {Promise<TReturn>}
      */
-    async invokeContentOrigin(action, params={}) {
+    async invokeContentOrigin(action, params = {}) {
         if (this._contentOriginTabId === this._tabId && this._contentOriginFrameId === this._frameId) {
             throw new Error('Content origin is same page');
         }
@@ -602,7 +604,7 @@ export class Display extends EventDispatcher {
      * @param {import('core').SerializableObject} [params]
      * @returns {Promise<TReturn>}
      */
-    async invokeParentFrame(action, params={}) {
+    async invokeParentFrame(action, params = {}) {
         if (this._parentFrameId === null || this._parentFrameId === this._frameId) {
             throw new Error('Invalid parent frame');
         }
diff --git a/ext/js/display/search-display-controller.js b/ext/js/display/search-display-controller.js
index b512a16d..44850cbb 100644
--- a/ext/js/display/search-display-controller.js
+++ b/ext/js/display/search-display-controller.js
@@ -94,11 +94,13 @@ export class SearchDisplayController {
         this._display.hotkeyHandler.registerActions([
             ['focusSearchBox', this._onActionFocusSearchBox.bind(this)]
         ]);
+        /* eslint-disable no-multi-spaces */
         this._registerMessageHandlers([
             ['SearchDisplayController.getMode',           {async: false, handler: this._onMessageGetMode.bind(this)}],
             ['SearchDisplayController.setMode',           {async: false, handler: this._onMessageSetMode.bind(this)}],
             ['SearchDisplayController.updateSearchQuery', {async: false, handler: this._onExternalSearchUpdate.bind(this)}]
         ]);
+        /* eslint-enable no-multi-spaces */
 
         this._updateClipboardMonitorEnabled();
 
@@ -285,7 +287,7 @@ export class SearchDisplayController {
     /**
      * @param {{text: string, animate?: boolean}} details
      */
-    _onExternalSearchUpdate({text, animate=true}) {
+    _onExternalSearchUpdate({text, animate = true}) {
         const options = this._display.getOptions();
         if (options === null) { return; }
         const {clipboard: {autoSearchContent, maximumSearchLength}} = options;
diff --git a/ext/js/dom/document-focus-controller.js b/ext/js/dom/document-focus-controller.js
index 32ea2ce8..fd88a35d 100644
--- a/ext/js/dom/document-focus-controller.js
+++ b/ext/js/dom/document-focus-controller.js
@@ -28,7 +28,7 @@ export class DocumentFocusController {
      * @param {?string} autofocusElementSelector A selector string which can be used to specify an element which
      *   should be automatically focused on prepare.
      */
-    constructor(autofocusElementSelector=null) {
+    constructor(autofocusElementSelector = null) {
         /** @type {?HTMLElement} */
         this._autofocusElement = (autofocusElementSelector !== null ? document.querySelector(autofocusElementSelector) : null);
         /** @type {?HTMLElement} */
diff --git a/ext/js/dom/document-util.js b/ext/js/dom/document-util.js
index 0153e74a..fe10d670 100644
--- a/ext/js/dom/document-util.js
+++ b/ext/js/dom/document-util.js
@@ -349,7 +349,7 @@ export class DocumentUtil {
      * @param {EventListener} onFullscreenChanged The event callback.
      * @param {?import('../core.js').EventListenerCollection} eventListenerCollection An optional `EventListenerCollection` to add the registration to.
      */
-    static addFullscreenChangeEventListener(onFullscreenChanged, eventListenerCollection=null) {
+    static addFullscreenChangeEventListener(onFullscreenChanged, eventListenerCollection = null) {
         const target = document;
         const options = false;
         const fullscreenEventNames = [
diff --git a/ext/js/dom/dom-data-binder.js b/ext/js/dom/dom-data-binder.js
index cf98a243..e2558338 100644
--- a/ext/js/dom/dom-data-binder.js
+++ b/ext/js/dom/dom-data-binder.js
@@ -27,7 +27,7 @@ export class DOMDataBinder {
     /**
      * @param {import('dom-data-binder').ConstructorDetails<T>} details
      */
-    constructor({selector, createElementMetadata, compareElementMetadata, getValues, setValues, onError=null}) {
+    constructor({selector, createElementMetadata, compareElementMetadata, getValues, setValues, onError = null}) {
         /** @type {string} */
         this._selector = selector;
         /** @type {import('dom-data-binder').CreateElementMetadataCallback<T>} */
diff --git a/ext/js/dom/dom-text-scanner.js b/ext/js/dom/dom-text-scanner.js
index 42e0acc9..df097688 100644
--- a/ext/js/dom/dom-text-scanner.js
+++ b/ext/js/dom/dom-text-scanner.js
@@ -31,7 +31,7 @@ export class DOMTextScanner {
      *   regardless of CSS styling.
      * @param {boolean} generateLayoutContent Whether or not newlines should be added based on CSS styling.
      */
-    constructor(node, offset, forcePreserveWhitespace=false, generateLayoutContent=true) {
+    constructor(node, offset, forcePreserveWhitespace = false, generateLayoutContent = true) {
         const ruby = DOMTextScanner.getParentRubyElement(node);
         const resetOffset = (ruby !== null);
         if (resetOffset) { node = ruby; }
diff --git a/ext/js/dom/panel-element.js b/ext/js/dom/panel-element.js
index 748c3a36..d4cb28fd 100644
--- a/ext/js/dom/panel-element.js
+++ b/ext/js/dom/panel-element.js
@@ -57,7 +57,7 @@ export class PanelElement extends EventDispatcher {
      * @param {boolean} value
      * @param {boolean} [animate]
      */
-    setVisible(value, animate=true) {
+    setVisible(value, animate = true) {
         value = !!value;
         if (this.isVisible() === value) { return; }
 
diff --git a/ext/js/dom/popup-menu.js b/ext/js/dom/popup-menu.js
index 33cdd1ae..72df82a0 100644
--- a/ext/js/dom/popup-menu.js
+++ b/ext/js/dom/popup-menu.js
@@ -96,7 +96,7 @@ export class PopupMenu extends EventDispatcher {
      * @param {boolean} [cancelable]
      * @returns {boolean}
      */
-    close(cancelable=true) {
+    close(cancelable = true) {
         return this._close(null, 'close', cancelable, null);
     }
 
diff --git a/ext/js/dom/selector-observer.js b/ext/js/dom/selector-observer.js
index 2cf46543..8dd18242 100644
--- a/ext/js/dom/selector-observer.js
+++ b/ext/js/dom/selector-observer.js
@@ -25,7 +25,7 @@ export class SelectorObserver {
      * Creates a new instance.
      * @param {import('selector-observer').ConstructorDetails<T>} details The configuration for the object.
      */
-    constructor({selector, ignoreSelector=null, onAdded=null, onRemoved=null, onChildrenUpdated=null, isStale=null}) {
+    constructor({selector, ignoreSelector = null, onAdded = null, onRemoved = null, onChildrenUpdated = null, isStale = null}) {
         /** @type {string} */
         this._selector = selector;
         /** @type {?string} */
@@ -65,7 +65,7 @@ export class SelectorObserver {
      * @throws {Error} An error if element is null.
      * @throws {Error} An error if an element is already being observed.
      */
-    observe(element, attributes=false) {
+    observe(element, attributes = false) {
         if (element === null) {
             throw new Error('Invalid element');
         }
diff --git a/ext/js/general/text-source-map.js b/ext/js/general/text-source-map.js
index b03f6eb2..cfccf7c9 100644
--- a/ext/js/general/text-source-map.js
+++ b/ext/js/general/text-source-map.js
@@ -21,7 +21,7 @@ export class TextSourceMap {
      * @param {string} source
      * @param {number[]|null} [mapping=null]
      */
-    constructor(source, mapping=null) {
+    constructor(source, mapping = null) {
         /** @type {string} */
         this._source = source;
         /** @type {?number[]} */
diff --git a/ext/js/input/hotkey-util.js b/ext/js/input/hotkey-util.js
index 10328924..601f5d55 100644
--- a/ext/js/input/hotkey-util.js
+++ b/ext/js/input/hotkey-util.js
@@ -24,7 +24,7 @@ export class HotkeyUtil {
      * Creates a new instance.
      * @param {?import('environment').OperatingSystem} os The operating system for this instance.
      */
-    constructor(os=null) {
+    constructor(os = null) {
         /** @type {?import('environment').OperatingSystem} */
         this._os = os;
         /** @type {string} */
diff --git a/ext/js/language/deinflector.js b/ext/js/language/deinflector.js
index b7a235d0..537a4556 100644
--- a/ext/js/language/deinflector.js
+++ b/ext/js/language/deinflector.js
@@ -103,6 +103,8 @@ export class Deinflector {
     }
 }
 
+
+/* eslint-disable no-multi-spaces */
 /** @type {Map<string, import('translation-internal').DeinflectionRuleFlags>} */
 // eslint-disable-next-line no-underscore-dangle
 Deinflector._ruleTypes = new Map([
@@ -114,3 +116,4 @@ Deinflector._ruleTypes = new Map([
     ['adj-i', /** @type {import('translation-internal').DeinflectionRuleFlags} */ (0b00100000)], // Adjective i
     ['iru',   /** @type {import('translation-internal').DeinflectionRuleFlags} */ (0b01000000)] // Intermediate -iru endings for progressive or perfect tense
 ]);
+/* eslint-enable no-multi-spaces */
diff --git a/ext/js/language/dictionary-importer.js b/ext/js/language/dictionary-importer.js
index 08fcf86b..dfbd9590 100644
--- a/ext/js/language/dictionary-importer.js
+++ b/ext/js/language/dictionary-importer.js
@@ -112,11 +112,11 @@ export class DictionaryImporter {
         const dataBankSchemas = this._getDataBankSchemas(version);
 
         // Files
-        const termFiles      = this._getArchiveFiles(fileMap, 'term_bank_?.json');
-        const termMetaFiles  = this._getArchiveFiles(fileMap, 'term_meta_bank_?.json');
-        const kanjiFiles     = this._getArchiveFiles(fileMap, 'kanji_bank_?.json');
+        const termFiles = this._getArchiveFiles(fileMap, 'term_bank_?.json');
+        const termMetaFiles = this._getArchiveFiles(fileMap, 'term_meta_bank_?.json');
+        const kanjiFiles = this._getArchiveFiles(fileMap, 'kanji_bank_?.json');
         const kanjiMetaFiles = this._getArchiveFiles(fileMap, 'kanji_meta_bank_?.json');
-        const tagFiles       = this._getArchiveFiles(fileMap, 'tag_bank_?.json');
+        const tagFiles = this._getArchiveFiles(fileMap, 'tag_bank_?.json');
 
         // Load data
         this._progressNextStep(termFiles.length + termMetaFiles.length + kanjiFiles.length + kanjiMetaFiles.length + tagFiles.length);
@@ -538,7 +538,7 @@ export class DictionaryImporter {
          */
         const createError = (message) => {
             const {expression, reading} = entry;
-            const readingSource = reading.length > 0 ? ` (${reading})`: '';
+            const readingSource = reading.length > 0 ? ` (${reading})` : '';
             return new Error(`${message} at path ${JSON.stringify(path)} for ${expression}${readingSource} in ${dictionary}`);
         };
 
diff --git a/ext/js/language/sandbox/japanese-util.js b/ext/js/language/sandbox/japanese-util.js
index 6f4fc8e0..9d36497a 100644
--- a/ext/js/language/sandbox/japanese-util.js
+++ b/ext/js/language/sandbox/japanese-util.js
@@ -88,7 +88,7 @@ const JAPANESE_RANGES = [
     [0xff1a, 0xff1f], // Fullwidth punctuation 2
     [0xff3b, 0xff3f], // Fullwidth punctuation 3
     [0xff5b, 0xff60], // Fullwidth punctuation 4
-    [0xffe0, 0xffee]  // Currency markers
+    [0xffe0, 0xffee] // Currency markers
 ];
 
 const SMALL_KANA_SET = new Set(Array.from('ぁぃぅぇぉゃゅょゎァィゥェォャュョヮ'));
@@ -235,7 +235,7 @@ export class JapaneseUtil {
     /**
      * @param {?import('wanakana')|import('../../../lib/wanakana.js')} wanakana
      */
-    constructor(wanakana=null) {
+    constructor(wanakana = null) {
         /** @type {?import('wanakana')} */
         this._wanakana = /** @type {import('wanakana')} */ (wanakana);
     }
@@ -386,7 +386,7 @@ export class JapaneseUtil {
      * @param {boolean} [keepProlongedSoundMarks]
      * @returns {string}
      */
-    convertKatakanaToHiragana(text, keepProlongedSoundMarks=false) {
+    convertKatakanaToHiragana(text, keepProlongedSoundMarks = false) {
         let result = '';
         const offset = (HIRAGANA_CONVERSION_RANGE[0] - KATAKANA_CONVERSION_RANGE[0]);
         for (let char of text) {
@@ -469,7 +469,7 @@ export class JapaneseUtil {
      * @param {?import('../../general/text-source-map.js').TextSourceMap} [sourceMap]
      * @returns {string}
      */
-    convertHalfWidthKanaToFullWidth(text, sourceMap=null) {
+    convertHalfWidthKanaToFullWidth(text, sourceMap = null) {
         let result = '';
 
         // This function is safe to use charCodeAt instead of codePointAt, since all
@@ -516,7 +516,7 @@ export class JapaneseUtil {
      * @param {?import('../../general/text-source-map.js').TextSourceMap} sourceMap
      * @returns {string}
      */
-    convertAlphabeticToKana(text, sourceMap=null) {
+    convertAlphabeticToKana(text, sourceMap = null) {
         let part = '';
         let result = '';
 
@@ -679,7 +679,7 @@ export class JapaneseUtil {
      * @param {?import('../../general/text-source-map.js').TextSourceMap} [sourceMap]
      * @returns {string}
      */
-    collapseEmphaticSequences(text, fullCollapse, sourceMap=null) {
+    collapseEmphaticSequences(text, fullCollapse, sourceMap = null) {
         let result = '';
         let collapseCodePoint = -1;
         const hasSourceMap = (sourceMap !== null);
diff --git a/ext/js/language/text-scanner.js b/ext/js/language/text-scanner.js
index 3de16f54..800e3697 100644
--- a/ext/js/language/text-scanner.js
+++ b/ext/js/language/text-scanner.js
@@ -31,12 +31,12 @@ export class TextScanner extends EventDispatcher {
     constructor({
         node,
         getSearchContext,
-        ignoreElements=null,
-        ignorePoint=null,
-        searchTerms=false,
-        searchKanji=false,
-        searchOnClick=false,
-        searchOnClickOnly=false
+        ignoreElements = null,
+        ignorePoint = null,
+        searchTerms = false,
+        searchKanji = false,
+        searchOnClick = false,
+        searchOnClickOnly = false
     }) {
         super();
         /** @type {HTMLElement|Window} */
diff --git a/ext/js/pages/settings/backup-controller.js b/ext/js/pages/settings/backup-controller.js
index 94f85416..85803077 100644
--- a/ext/js/pages/settings/backup-controller.js
+++ b/ext/js/pages/settings/backup-controller.js
@@ -540,7 +540,7 @@ export class BackupController {
      * @param {string} message
      * @param {boolean} [isWarning]
      */
-    _databaseExportImportErrorMessage(message, isWarning=false) {
+    _databaseExportImportErrorMessage(message, isWarning = false) {
         /** @type {HTMLElement} */
         const errorMessageContainer = querySelectorNotNull(document, '#db-ops-error-report');
         errorMessageContainer.style.display = 'block';
diff --git a/ext/js/pages/settings/dictionary-controller.js b/ext/js/pages/settings/dictionary-controller.js
index 0d84ccbf..63671feb 100644
--- a/ext/js/pages/settings/dictionary-controller.js
+++ b/ext/js/pages/settings/dictionary-controller.js
@@ -324,7 +324,7 @@ class DictionaryExtraInfo {
                 node.parentNode.removeChild(node);
             }
         }
-        this._nodes.length =0;
+        this._nodes.length = 0;
     }
 
     // Private
diff --git a/ext/js/pages/settings/keyboard-mouse-input-field.js b/ext/js/pages/settings/keyboard-mouse-input-field.js
index f0a53f1a..99af3941 100644
--- a/ext/js/pages/settings/keyboard-mouse-input-field.js
+++ b/ext/js/pages/settings/keyboard-mouse-input-field.js
@@ -30,7 +30,7 @@ export class KeyboardMouseInputField extends EventDispatcher {
      * @param {?import('environment').OperatingSystem} os
      * @param {?(pointerType: string) => boolean} [isPointerTypeSupported]
      */
-    constructor(inputNode, mouseButton, os, isPointerTypeSupported=null) {
+    constructor(inputNode, mouseButton, os, isPointerTypeSupported = null) {
         super();
         /** @type {HTMLInputElement} */
         this._inputNode = inputNode;
@@ -65,7 +65,7 @@ export class KeyboardMouseInputField extends EventDispatcher {
      * @param {boolean} [mouseModifiersSupported]
      * @param {boolean} [keySupported]
      */
-    prepare(key, modifiers, mouseModifiersSupported=false, keySupported=false) {
+    prepare(key, modifiers, mouseModifiersSupported = false, keySupported = false) {
         this.cleanup();
 
         this._mouseModifiersSupported = mouseModifiersSupported;
diff --git a/ext/js/pages/settings/keyboard-shortcuts-controller.js b/ext/js/pages/settings/keyboard-shortcuts-controller.js
index 0734faa1..cbdae77d 100644
--- a/ext/js/pages/settings/keyboard-shortcuts-controller.js
+++ b/ext/js/pages/settings/keyboard-shortcuts-controller.js
@@ -46,6 +46,7 @@ export class KeyboardShortcutController {
         this._stringComparer = new Intl.Collator('en-US'); // Invariant locale
         /** @type {HTMLElement} */
         this._scrollContainer = querySelectorNotNull(document, '#keyboard-shortcuts-modal .modal-body');
+        /* eslint-disable no-multi-spaces */
         /** @type {Map<string, import('keyboard-shortcut-controller').ActionDetails>} */
         this._actionDetails = new Map([
             ['',                                 {scopes: new Set()}],
@@ -70,6 +71,7 @@ export class KeyboardShortcutController {
             ['scanTextAtCaret',                  {scopes: new Set(['web'])}],
             ['toggleOption',                     {scopes: new Set(['popup', 'search']), argument: {template: 'hotkey-argument-setting-path', default: ''}}]
         ]);
+        /* eslint-enable no-multi-spaces */
     }
 
     /** @type {import('./settings-controller.js').SettingsController} */
diff --git a/ext/js/pages/settings/popup-preview-frame.js b/ext/js/pages/settings/popup-preview-frame.js
index e5cc6580..7828a025 100644
--- a/ext/js/pages/settings/popup-preview-frame.js
+++ b/ext/js/pages/settings/popup-preview-frame.js
@@ -57,6 +57,7 @@ export class PopupPreviewFrame {
         /** @type {string} */
         this._targetOrigin = chrome.runtime.getURL('/').replace(/\/$/, '');
 
+        /* eslint-disable no-multi-spaces */
         /** @type {Map<string, (params: import('core').SerializableObjectAny) => void>} */
         this._windowMessageHandlers = new Map(/** @type {[key: string, handler: (params: import('core').SerializableObjectAny) => void][]} */ ([
             ['PopupPreviewFrame.setText',              this._onSetText.bind(this)],
@@ -64,6 +65,7 @@ export class PopupPreviewFrame {
             ['PopupPreviewFrame.setCustomOuterCss',    this._setCustomOuterCss.bind(this)],
             ['PopupPreviewFrame.updateOptionsContext', this._updateOptionsContext.bind(this)]
         ]));
+        /* eslint-enable no-multi-spaces */
     }
 
     /** */
diff --git a/ext/js/pages/settings/profile-conditions-ui.js b/ext/js/pages/settings/profile-conditions-ui.js
index e02d2585..715aeb69 100644
--- a/ext/js/pages/settings/profile-conditions-ui.js
+++ b/ext/js/pages/settings/profile-conditions-ui.js
@@ -50,6 +50,7 @@ export class ProfileConditionsUI extends EventDispatcher {
         const normalizeInteger = this._normalizeInteger.bind(this);
         const validateFlags = this._validateFlags.bind(this);
         const normalizeFlags = this._normalizeFlags.bind(this);
+        /* eslint-disable no-multi-spaces */
         /** @type {Map<import('profile-conditions-ui').DescriptorType, import('profile-conditions-ui').Descriptor>} */
         this._descriptors = new Map([
             [
@@ -105,6 +106,7 @@ export class ProfileConditionsUI extends EventDispatcher {
                 }
             ]
         ]);
+        /* eslint-enable no-multi-spaces */
         /** @type {Set<string>} */
         this._validFlags = new Set([
             'clipboard'
@@ -217,12 +219,12 @@ export class ProfileConditionsUI extends EventDispatcher {
         const info = this._getOperatorDetails(type, operator);
 
         const {
-            displayName=operator,
-            type: type2='string',
-            defaultValue='',
-            resetDefaultOnChange=false,
-            validate=null,
-            normalize=null
+            displayName = operator,
+            type: type2 = 'string',
+            defaultValue = '',
+            resetDefaultOnChange = false,
+            validate = null,
+            normalize = null
         } = (typeof info === 'undefined' ? {} : info);
 
         return {
diff --git a/ext/js/script/dynamic-loader.js b/ext/js/script/dynamic-loader.js
index 75bf7b8b..8fdb77e9 100644
--- a/ext/js/script/dynamic-loader.js
+++ b/ext/js/script/dynamic-loader.js
@@ -64,7 +64,7 @@ export const dynamicLoader = (() => {
      * @returns {Promise<?HTMLStyleElement|HTMLLinkElement>}
      * @throws {Error}
      */
-    async function loadStyle(id, type, value, useWebExtensionApi=false, parentNode=null) {
+    async function loadStyle(id, type, value, useWebExtensionApi = false, parentNode = null) {
         if (useWebExtensionApi && yomitan.isExtensionUrl(window.location.href)) {
             // Permissions error will occur if trying to use the WebExtension API to inject into an extension page
             useWebExtensionApi = false;
diff --git a/ext/js/templates/sandbox/anki-template-renderer.js b/ext/js/templates/sandbox/anki-template-renderer.js
index dbf395e9..857922bf 100644
--- a/ext/js/templates/sandbox/anki-template-renderer.js
+++ b/ext/js/templates/sandbox/anki-template-renderer.js
@@ -74,6 +74,7 @@ export class AnkiTemplateRenderer {
      * Prepares the data that is necessary before the template renderer can be safely used.
      */
     async prepare() {
+        /* eslint-disable no-multi-spaces */
         this._templateRenderer.registerHelpers([
             ['dumpObject',       this._dumpObject.bind(this)],
             ['furigana',         this._furigana.bind(this)],
@@ -103,6 +104,7 @@ export class AnkiTemplateRenderer {
             ['hiragana',         this._hiragana.bind(this)],
             ['katakana',         this._katakana.bind(this)]
         ]);
+        /* eslint-enable no-multi-spaces */
         this._templateRenderer.registerDataType('ankiNote', {
             modifier: ({marker, commonData}) => this._ankiNoteDataCreator.create(marker, commonData),
             composeData: ({marker}, commonData) => ({marker, commonData})
@@ -392,9 +394,9 @@ export class AnkiTemplateRenderer {
             case '!=': return operand1 != operand2; // eslint-disable-line eqeqeq
             case '===': return operand1 === operand2;
             case '!==': return operand1 !== operand2;
-            case '<':  return operand1 < operand2;
+            case '<': return operand1 < operand2;
             case '<=': return operand1 <= operand2;
-            case '>':  return operand1 > operand2;
+            case '>': return operand1 > operand2;
             case '>=': return operand1 >= operand2;
             case '<<': return operand1 << operand2;
             case '>>': return operand1 >> operand2;
diff --git a/ext/js/templates/sandbox/template-renderer-media-provider.js b/ext/js/templates/sandbox/template-renderer-media-provider.js
index d8a0a16d..0a7f5d9b 100644
--- a/ext/js/templates/sandbox/template-renderer-media-provider.js
+++ b/ext/js/templates/sandbox/template-renderer-media-provider.js
@@ -79,7 +79,7 @@ export class TemplateRendererMediaProvider {
      */
     _getFormattedValue(data, namedArgs) {
         let {value} = data;
-        const {escape=true} = namedArgs;
+        const {escape = true} = namedArgs;
         if (escape) {
             value = Handlebars.Utils.escapeExpression(value);
         }
diff --git a/ext/js/templates/template-renderer-proxy.js b/ext/js/templates/template-renderer-proxy.js
index 642eea8b..7cbab3c8 100644
--- a/ext/js/templates/template-renderer-proxy.js
+++ b/ext/js/templates/template-renderer-proxy.js
@@ -99,7 +99,7 @@ export class TemplateRendererProxy {
      * @param {number} [timeout]
      * @returns {Promise<void>}
      */
-    _loadFrame(frame, url, timeout=5000) {
+    _loadFrame(frame, url, timeout = 5000) {
         return new Promise((resolve, reject) => {
             let state = 0x0; // 0x1 = frame added; 0x2 = frame loaded; 0x4 = frame ready
             const cleanup = () => {
@@ -165,7 +165,7 @@ export class TemplateRendererProxy {
      * @param {?number} [timeout]
      * @returns {Promise<unknown>}
      */
-    _invoke(action, params, timeout=null) {
+    _invoke(action, params, timeout = null) {
         return new Promise((resolve, reject) => {
             const frameWindow = (this._frame !== null ? this._frame.contentWindow : null);
             if (frameWindow === null) {
diff --git a/ext/js/yomitan.js b/ext/js/yomitan.js
index 7cf67aec..37455d00 100644
--- a/ext/js/yomitan.js
+++ b/ext/js/yomitan.js
@@ -88,6 +88,7 @@ export class Yomitan extends EventDispatcher {
         /** @type {?(() => void)} */
         this._isBackendReadyPromiseResolve = resolve;
 
+        /* eslint-disable no-multi-spaces */
         /** @type {import('core').MessageHandlerMap} */
         this._messageHandlers = new Map(/** @type {import('core').MessageHandlerArray} */ ([
             ['Yomitan.isReady',         {async: false, handler: this._onMessageIsReady.bind(this)}],
@@ -97,6 +98,7 @@ export class Yomitan extends EventDispatcher {
             ['Yomitan.databaseUpdated', {async: false, handler: this._onMessageDatabaseUpdated.bind(this)}],
             ['Yomitan.zoomChanged',     {async: false, handler: this._onMessageZoomChanged.bind(this)}]
         ]));
+        /* eslint-enable no-multi-spaces */
     }
 
     /**
@@ -140,7 +142,7 @@ export class Yomitan extends EventDispatcher {
      * Prepares the instance for use.
      * @param {boolean} [isBackground=false] Assigns whether this instance is being used from the background page/service worker.
      */
-    async prepare(isBackground=false) {
+    async prepare(isBackground = false) {
         this._isBackground = isBackground;
         chrome.runtime.onMessage.addListener(this._onMessage.bind(this));