[JS] Try to fully target older browsers

app/javascript/src/javascripts/posts.js

@@ -966,6 +966,7 @@ Post.disapprove = function(post_id, reason, should_reload) {
 Post.update_tag_count = function(event) {
   let string = "0 tags";
   let count = 0;
+  let count2 = 0;
 
   if (event) {
     let tags = [...new Set($(event.target).val().match(/\S+/g))];

babel.config.js

@@ -25,7 +25,7 @@ module.exports = function (api) {
           useBuiltIns: 'entry',
           corejs: '3.8',
           modules: 'auto',
-          bugfixes: true,
+          forceAllTransforms: true,
           exclude: ['transform-typeof-symbol']
         }
       ],
@@ -42,7 +42,6 @@ module.exports = function (api) {
       ]
     ].filter(Boolean),
     plugins: [
-      ['@babel/plugin-proposal-class-properties', { loose: true }],
       ['@babel/plugin-transform-runtime', { helpers: false }],
       isProductionEnv &&
       moduleExists('babel-plugin-transform-react-remove-prop-types') && [

config/webpack/base.js

@@ -16,9 +16,13 @@ const customConfig = {
   output: {
     library: ["Danbooru"]
   },
+  optimization: {
+    runtimeChunk: false
+  },
   externals: {
     jquery: "jQuery"
-  }
+  },
+  target: ['web', 'es5']
 }
 
 module.exports = merge(vueConfig, webpackConfig, customConfig)