feat: update src/js/.eslintrc.js

enable no-undefined rule, and disable no-void rule

src/js/.eslintrc.js

@@ -12,6 +12,8 @@ module.exports = {
     'plugin:compat/recommended'
   ],
   rules: {
+    'no-undefined': 'error',
+    'no-void': 0,
     'object-shorthand': [
       'error',
       'always'

src/js/dashboard.js

@@ -763,7 +763,7 @@ page.getUploads = (params = {}) => {
         div.className = 'image-container column'
         div.dataset.id = upload.id
 
-        if (upload.thumb === undefined) {
+        if (typeof upload.thumb === 'undefined') {
           div.innerHTML = `<a class="image" href="${upload.file}" target="_blank"><h1 class="title">${upload.extname || 'N/A'}</h1></a>`
         } else {
           div.innerHTML = `<a class="image" href="${upload.file}" target="_blank"><img alt="${upload.name}" data-src="${upload.thumb}"/></a>`
@@ -934,7 +934,7 @@ page.setUploadsView = (view, element) => {
 
   if (view === 'list') {
     delete localStorage[lsKeys.viewType[page.currentView]]
-    page.views[page.currentView].type = undefined
+    page.views[page.currentView].type = void 0
   } else {
     localStorage[lsKeys.viewType[page.currentView]] = view
     page.views[page.currentView].type = view
@@ -3127,7 +3127,7 @@ page.getStatistics = (params = {}) => {
               case 'byteUsage': {
                 if (typeof value === 'object') {
                   // Reasoning: https://github.com/sebhildebrandt/systeminformation/issues/464#issuecomment-756406053
-                  const totalForPercentage = value.available !== undefined
+                  const totalForPercentage = typeof value.available !== 'undefined'
                     ? (value.used + value.available)
                     : value.total
                   parsed = `${page.getPrettyBytes(value.used)} / ${page.getPrettyBytes(value.total)} (${(value.used / totalForPercentage * 100).toFixed(2)}%)`

src/js/home.js

@@ -850,7 +850,7 @@ page.prepareUploadConfig = () => {
             default: page.fileIdentifierLength.default,
             round: true
           }
-        : undefined,
+        : void 0,
       help: true, // true means auto-generated, for number-based configs only
       disabled: fileIdentifierLength && page.fileIdentifierLength.force
     },
@@ -979,9 +979,9 @@ page.prepareUploadConfig = () => {
       } else {
         const stored = localStorage[lsKeys[key]]
         if (Array.isArray(conf.select)) {
-          value = conf.select.find(sel => sel.value === stored)
-            ? stored
-            : undefined
+          if (conf.select.find(sel => sel.value === stored)) {
+            value = stored
+          }
         } else {
           value = stored
         }

src/js/misc/render.js

@@ -52,7 +52,7 @@ render.showTogglePrompt = () => {
     if (value === 'reload') {
       render.do(true)
     } else if (value) {
-      const newValue = div.querySelector('#swalRender').checked ? undefined : '0'
+      const newValue = div.querySelector('#swalRender').checked ? void 0 : '0'
       if (newValue !== localStorage[render.lsKey]) {
         if (newValue) localStorage[render.lsKey] = newValue
         else localStorage.removeItem(render.lsKey)