Add 'nodejs' buildback (Ref: rails/webpacker#739)

.gitignore

@@ -10,6 +10,7 @@
 # Ignore the default SQLite database.
 /db/*.sqlite3
 /db/*.sqlite3-journal
+/config/database.yml
 
 # Ignore all logfiles and tempfiles.
 /log/*

app.json

@@ -1,24 +1,31 @@
 {
   "name": "elmsanity",
   "description": "",
-  "scripts": {
-    "postdeploy": "cp config/database.yml.postgresql config/database.yml; bundle exec rails db:create; bundle exec rails db:migrate; NODE_ENV=production bundle exec rails webpacker:compile"
-  },
+  "scripts": {},
   "env": {
     "SECRET_KEY_BASE": {
       "generator": "secret"
-    },
-    "RACK_ENV": "staging",
-    "RAILS_ENV": "staging",
-    "LOG_LEVEL": "DEBUG",
-    "HEROKU": "true"
+    }
   },
   "formation": {
+    "web": {
+      "quantity": 1
+    }
   },
   "addons": [
-
+    {
+      "plan": "heroku-postgresql",
+      "options": {
+        "version": "9.5"
+      }
+    }
   ],
   "buildpacks": [
-
+    {
+      "url": "heroku/nodejs"
+    },
+    {
+      "url": "heroku/ruby"
+    }
   ]
 }

config/webpacker.yml

@@ -66,4 +66,6 @@ production:
 staging:
   <<: *default
   compile: false
+
+  # Cache manifest.json for performance
   cache_manifest: true

lib/tasks/assets.rake

@@ -0,0 +1,6 @@
+namespace :assets do
+  desc "Compile assets"
+  task precompile: [:environment] do
+    Rake::Task["webpacker:compile"].invoke
+  end
+end

yarn.lock

@@ -1722,8 +1722,8 @@ error-ex@^1.2.0:
     is-arrayish "^0.2.1"
 
 es-abstract@^1.7.0:
-  version "1.9.0"
-  resolved "https://registry.yarnpkg.com/es-abstract/-/es-abstract-1.9.0.tgz#690829a07cae36b222e7fd9b75c0d0573eb25227"
+  version "1.10.0"
+  resolved "https://registry.yarnpkg.com/es-abstract/-/es-abstract-1.10.0.tgz#1ecb36c197842a00d8ee4c2dfd8646bb97d60864"
   dependencies:
     es-to-primitive "^1.1.1"
     function-bind "^1.1.1"
@@ -1887,7 +1887,7 @@ expand-range@^1.8.1:
   dependencies:
     fill-range "^2.1.0"
 
-express@^4.13.3:
+express@^4.16.2:
   version "4.16.2"
   resolved "https://registry.yarnpkg.com/express/-/express-4.16.2.tgz#e35c6dfe2d64b7dca0a5cd4f21781be3299e076c"
   dependencies:
@@ -5397,8 +5397,8 @@ webpack-dev-middleware@^1.11.0:
     time-stamp "^2.0.0"
 
 webpack-dev-server@^2.9.4:
-  version "2.9.4"
-  resolved "https://registry.yarnpkg.com/webpack-dev-server/-/webpack-dev-server-2.9.4.tgz#7883e61759c6a4b33e9b19ec4037bd4ab61428d1"
+  version "2.9.5"
+  resolved "https://registry.yarnpkg.com/webpack-dev-server/-/webpack-dev-server-2.9.5.tgz#79336fba0087a66ae491f4869f6545775b18daa8"
   dependencies:
     ansi-html "0.0.7"
     array-includes "^3.0.3"
@@ -5408,7 +5408,7 @@ webpack-dev-server@^2.9.4:
     connect-history-api-fallback "^1.3.0"
     debug "^3.1.0"
     del "^3.0.0"
-    express "^4.13.3"
+    express "^4.16.2"
     html-entities "^1.2.0"
     http-proxy-middleware "~0.17.4"
     import-local "^0.1.1"