introduce plugin:@typescript-eslint/stylistic-type-checked, fix lint issues

Author: NomarCub

.eslintrc.json

@@ -16,6 +16,7 @@
     "eslint:recommended",
     "plugin:@typescript-eslint/eslint-recommended",
     "plugin:@typescript-eslint/strict-type-checked",
+    "plugin:@typescript-eslint/stylistic-type-checked",
     "plugin:@stylistic/recommended-extends"
   ],
   "rules": {
@@ -26,6 +27,12 @@
         "allowNumber": true
       }
     ],
+    "@typescript-eslint/prefer-nullish-coalescing": [
+      "error",
+      {
+        "ignoreConditionalTests": true
+      }
+    ],
     "@stylistic/indent": [
       "warn",
       4

src/main.ts

@@ -11,7 +11,7 @@ import { CopyUrlInPreviewSettingTab, CopyUrlInPreviewSettings, DEFAULT_SETTINGS
 export default class CopyUrlInPreview extends Plugin {
     longTapTimeoutId?: number;
     openPdfMenu?: Menu;
-    preventReopenPdfMenu: boolean = false;
+    preventReopenPdfMenu = false;
     lastHoveredLinkTarget?: string;
     canvasCardMenu?: HTMLElement;
     settings!: CopyUrlInPreviewSettings;
@@ -35,7 +35,7 @@ export default class CopyUrlInPreview extends Plugin {
         // register the image menu for canvas
         this.registerEvent(this.app.workspace.on("file-menu", (menu, file, source) => {
             if (source === "canvas-menu" && file instanceof TFile
-              && (file.extension.match(imageFileRegex) || file.extension === "pdf")) {
+              && (file.extension.match(imageFileRegex) ?? file.extension === "pdf")) {
                 menu.addItem(item => setMenuItem(item, "open-in-new-tab")
                     .onClick(() => { openTfileInNewTab(this.app, file); })
                 );