Use the latest stable release of webpacker

Gemfile

@@ -15,7 +15,7 @@ gem "selenium-webdriver", ">= 3.5.0", "< 3.13.0"
 gem "rack-cache", "~> 1.2"
 gem "sass-rails"
 gem "turbolinks", "~> 5"
-gem "webpacker", ">= 4.0.0.rc.3", require: ENV["SKIP_REQUIRE_WEBPACKER"] != "true"
+gem "webpacker", "~> 4.0.0", require: ENV["SKIP_REQUIRE_WEBPACKER"] != "true"
 # require: false so bcrypt is loaded only when has_secure_password is used.
 # This is to avoid Active Model (and by extension the entire framework)
 # being dependent on a binary library.

Gemfile.lock

@@ -505,7 +505,7 @@ GEM
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
       hashdiff
-    webpacker (4.0.0.rc.3)
+    webpacker (4.0.2)
       activesupport (>= 4.2)
       rack-proxy (>= 0.6.1)
       railties (>= 4.2)
@@ -588,7 +588,7 @@ DEPENDENCIES
   w3c_validators
   wdm (>= 0.1.0)
   webmock
-  webpacker (>= 4.0.0.rc.3)
+  webpacker (~> 4.0.0)
   websocket-client-simple!
 
 BUNDLED WITH

actionmailbox/test/dummy/package.json

@@ -2,7 +2,7 @@
   "name": "dummy",
   "private": true,
   "dependencies": {
-    "@rails/webpacker": "^3.2.2",
+    "@rails/webpacker": "^4.0.2",
     "activetext": "file:../.."
   },
   "devDependencies": {

actiontext/test/dummy/package.json

@@ -2,7 +2,7 @@
   "name": "dummy",
   "private": true,
   "dependencies": {
-    "@rails/webpacker": "^3.2.2",
+    "@rails/webpacker": "^4.0.2",
     "actiontext": "file:../.."
   },
   "devDependencies": {

railties/lib/rails/generators/app_base.rb

@@ -316,7 +316,7 @@ module Rails
         if options.dev? || options.edge?
           GemfileEntry.github "webpacker", "rails/webpacker", nil, "Use development version of Webpacker"
         else
-          GemfileEntry.version "webpacker", ">= 4.0.0.rc.3", "Transpile app-like JavaScript. Read more: https://github.com/rails/webpacker"
+          GemfileEntry.version "webpacker", "~> 4.0.0", "Transpile app-like JavaScript. Read more: https://github.com/rails/webpacker"
         end
       end