Misc JS linting and naming tweaks (#10652)

- lowercase all js filenames except Vue components
- enable new lint rules, mostly focused on shorter code
- autofix new lint violations
- apply misc transformations indexOf -> includes and onevent-> addEventListener

Co-authored-by: Antoine GIRARD <sapk@users.noreply.github.com>

webpack.config.js

@@ -9,11 +9,11 @@ const PostCSSSafeParser = require('postcss-safe-parser');
 const SpriteLoaderPlugin = require('svg-sprite-loader/plugin');
 const TerserPlugin = require('terser-webpack-plugin');
 const VueLoaderPlugin = require('vue-loader/lib/plugin');
-const { statSync } = require('fs');
-const { resolve, parse } = require('path');
-const { SourceMapDevToolPlugin } = require('webpack');
+const {statSync} = require('fs');
+const {resolve, parse} = require('path');
+const {SourceMapDevToolPlugin} = require('webpack');
 
-const glob = (pattern) => fastGlob.sync(pattern, { cwd: __dirname, absolute: true });
+const glob = (pattern) => fastGlob.sync(pattern, {cwd: __dirname, absolute: true});
 
 const themes = {};
 for (const path of glob('web_src/less/themes/*.less')) {
@@ -157,7 +157,7 @@ module.exports = {
               extract: true,
               spriteFilename: 'img/svg/icons.svg',
               symbolId: (path) => {
-                const { name } = parse(path);
+                const {name} = parse(path);
                 if (/@primer[/\\]octicons/.test(path)) {
                   return `octicon-${name}`;
                 }
@@ -194,7 +194,7 @@ module.exports = {
     }),
     new CopyPlugin([
       // workaround for https://github.com/go-gitea/gitea/issues/10653
-      { from: 'node_modules/fomantic-ui/dist/semantic.min.css', to: 'fomantic/semantic.min.css' },
+      {from: 'node_modules/fomantic-ui/dist/semantic.min.css', to: 'fomantic/semantic.min.css'},
     ]),
   ],
   performance: {