Update webpacker

.babelrc

@@ -1,18 +1,23 @@
 {
   "presets": [
-    ["env", {
-      "modules": false,
-      "targets": {
-        "browsers": "> 1%",
-        "uglify": true
-      },
-      "useBuiltIns": true
-    }]
+    [
+      "@babel/preset-env",
+      {
+        "modules": false,
+        "targets": {
+          "browsers": "> 1%",
+        }
+      }
+    ]
   ],
-
   "plugins": [
-    "syntax-dynamic-import",
-    "transform-object-rest-spread",
-    ["transform-class-properties", { "spec": true }]
+    "@babel/plugin-syntax-dynamic-import",
+    "@babel/plugin-proposal-object-rest-spread",
+    [
+      "@babel/plugin-proposal-class-properties",
+      {
+        "spec": true
+      }
+    ]
   ]
 }

Gemfile.lock

@@ -186,7 +186,7 @@ GEM
       activemodel (>= 5.0)
       bindex (>= 0.4.0)
       railties (>= 5.0)
-    webpacker (3.5.5)
+    webpacker (4.0.2)
       activesupport (>= 4.2)
       rack-proxy (>= 0.6.1)
       railties (>= 4.2)

bin/webpack

@@ -12,4 +12,8 @@ require "bundler/setup"
 
 require "webpacker"
 require "webpacker/webpack_runner"
-Webpacker::WebpackRunner.run(ARGV)
+
+APP_ROOT = File.expand_path("..", __dir__)
+Dir.chdir(APP_ROOT) do
+  Webpacker::WebpackRunner.run(ARGV)
+end

bin/webpack-dev-server

@@ -12,4 +12,8 @@ require "bundler/setup"
 
 require "webpacker"
 require "webpacker/dev_server_runner"
-Webpacker::DevServerRunner.run(ARGV)
+
+APP_ROOT = File.expand_path("..", __dir__)
+Dir.chdir(APP_ROOT) do
+  Webpacker::DevServerRunner.run(ARGV)
+end

package.json

@@ -2,10 +2,10 @@
   "name": "stimulus-search",
   "private": true,
   "dependencies": {
-    "@rails/webpacker": "3.5",
+    "@rails/webpacker": "4.0.2",
     "stimulus": "^1.1.0"
   },
   "devDependencies": {
-    "webpack-dev-server": "2.11.2"
+    "webpack-dev-server": "3.3.1"
   }
 }