【发布时间】：2021-03-17 11:40:52
【问题描述】：
对于注释，我已经多次推送我的 Rails / ReactJS 应用程序，在 Heroku 上没有任何问题。
经过一些更改后，我尝试重新推送它，但出现以下错误 =>
-----> Building on the Heroku-18 stack
-----> Using buildpacks:
1. heroku/nodejs
2. heroku/ruby
-----> Node.js app detected
-----> Creating runtime environment
NPM_CONFIG_LOGLEVEL=error
USE_YARN_CACHE=true
NODE_ENV=production
NODE_MODULES_CACHE=true
NODE_VERBOSE=false
-----> Installing binaries
engines.node (package.json): unspecified
engines.npm (package.json): unspecified (use default)
engines.yarn (package.json): unspecified (use default)
Resolving node version 14.x...
Downloading and installing node 14.16.0...
Using default npm version: 6.14.11
Resolving yarn version 1.22.x...
Downloading and installing yarn (1.22.10)
Installed yarn 1.22.10
-----> Installing dependencies
Installing node modules (yarn.lock)
yarn install v1.22.10
[1/4] Resolving packages...
[2/4] Fetching packages...
info fsevents@2.3.1: The platform "linux" is incompatible with this module.
info "fsevents@2.3.1" is an optional dependency and failed compatibility check. Excluding it from installation.
info fsevents@1.2.13: The platform "linux" is incompatible with this module.
info "fsevents@1.2.13" is an optional dependency and failed compatibility check. Excluding it from installation.
[3/4] Linking dependencies...
warning " > @babel/preset-react@7.12.10" has unmet peer dependency "@babel/core@^7.0.0-0".
warning "@babel/preset-react > @babel/plugin-transform-react-display-name@7.12.1" has unmet peer dependency "@babel/core@^7.0.0-0".
warning "@babel/preset-react > @babel/plugin-transform-react-jsx@7.12.12" has unmet peer dependency "@babel/core@^7.0.0-0".
warning "@babel/preset-react > @babel/plugin-transform-react-jsx-development@7.12.12" has unmet peer dependency "@babel/core@^7.0.0-0".
warning "@babel/preset-react > @babel/plugin-transform-react-pure-annotations@7.12.1" has unmet peer dependency "@babel/core@^7.0.0-0".
warning "@babel/preset-react > @babel/plugin-transform-react-jsx > @babel/plugin-syntax-jsx@7.12.1" has unmet peer dependency "@babel/core@^7.0.0-0".
warning " > @bumaga/tabs@0.2.0" has incorrect peer dependency "react@^16.8.0".
warning " > @bumaga/tabs@0.2.0" has incorrect peer dependency "react-dom@^16.8.0".
warning " > react-stripe-elements@6.1.2" has incorrect peer dependency "react@^15.5.4 || ^16.0.0-0".
warning " > react-stripe-elements@6.1.2" has incorrect peer dependency "react-dom@^15.5.4 || ^16.0.0-0".
warning " > redux-form@8.3.7" has incorrect peer dependency "react@^16.4.2".
warning " > webpack-dev-server@3.11.1" has unmet peer dependency "webpack@^4.0.0 || ^5.0.0".
warning "webpack-dev-server > webpack-dev-middleware@3.7.3" has unmet peer dependency "webpack@^4.0.0 || ^5.0.0".
[4/4] Building fresh packages...
Done in 54.06s.
-----> Build
-----> Pruning devDependencies
yarn install v1.22.10
[1/4] Resolving packages...
[2/4] Fetching packages...
info fsevents@2.3.1: The platform "linux" is incompatible with this module.
info "fsevents@2.3.1" is an optional dependency and failed compatibility check. Excluding it from installation.
info fsevents@1.2.13: The platform "linux" is incompatible with this module.
info "fsevents@1.2.13" is an optional dependency and failed compatibility check. Excluding it from installation.
[3/4] Linking dependencies...
warning " > @babel/preset-react@7.12.10" has unmet peer dependency "@babel/core@^7.0.0-0".
warning "@babel/preset-react > @babel/plugin-transform-react-display-name@7.12.1" has unmet peer dependency "@babel/core@^7.0.0-0".
warning "@babel/preset-react > @babel/plugin-transform-react-jsx@7.12.12" has unmet peer dependency "@babel/core@^7.0.0-0".
warning "@babel/preset-react > @babel/plugin-transform-react-jsx-development@7.12.12" has unmet peer dependency "@babel/core@^7.0.0-0".
warning "@babel/preset-react > @babel/plugin-transform-react-pure-annotations@7.12.1" has unmet peer dependency "@babel/core@^7.0.0-0".
warning "@babel/preset-react > @babel/plugin-transform-react-jsx > @babel/plugin-syntax-jsx@7.12.1" has unmet peer dependency "@babel/core@^7.0.0-0".
warning " > @bumaga/tabs@0.2.0" has incorrect peer dependency "react@^16.8.0".
warning " > @bumaga/tabs@0.2.0" has incorrect peer dependency "react-dom@^16.8.0".
warning " > react-stripe-elements@6.1.2" has incorrect peer dependency "react@^15.5.4 || ^16.0.0-0".
warning " > react-stripe-elements@6.1.2" has incorrect peer dependency "react-dom@^15.5.4 || ^16.0.0-0".
warning " > redux-form@8.3.7" has incorrect peer dependency "react@^16.4.2".
warning " > webpack-dev-server@3.11.1" has unmet peer dependency "webpack@^4.0.0 || ^5.0.0".
warning "webpack-dev-server > webpack-dev-middleware@3.7.3" has unmet peer dependency "webpack@^4.0.0 || ^5.0.0".
[4/4] Building fresh packages...
warning Ignored scripts due to flag.
Done in 10.51s.
-----> Caching build
- yarn cache
-----> Build succeeded!
! This app may not specify any way to start a node process
https://devcenter.heroku.com/articles/nodejs-support#default-web-process-type
! Unmet dependencies don't fail yarn install but may cause runtime issues
https://github.com/npm/npm/issues/7494
-----> Ruby app detected
-----> Installing bundler 2.2.11
-----> Removing BUNDLED WITH version in the Gemfile.lock
-----> Compiling Ruby/Rails
###### WARNING:
Your app was upgraded to bundler 2.2.11.
Previously you had a successful deploy with bundler 2.1.4.
If you see problems related to the bundler version please refer to:
https://devcenter.heroku.com/articles/bundler-version#known-upgrade-issues
-----> Using Ruby version: ruby-2.7.0
-----> Installing dependencies using bundler 2.2.11
Running: BUNDLE_WITHOUT='development:test' BUNDLE_PATH=vendor/bundle BUNDLE_BIN=vendor/bundle/bin BUNDLE_DEPLOYMENT=1 bundle install -j4
Your Gemfile lists the gem dotenv-rails (>= 0) more than once.
You should probably keep only one of them.
Remove any duplicate entries and specify the gem only once.
While it's not a problem now, it could cause errors if you change the version of one of them later.
Fetching gem metadata from https://rubygems.org/..........
Fetching https://github.com/mailjet/mailjet-gem.git
Using rake 13.0.3
Using concurrent-ruby 1.1.7
Using minitest 5.14.3
Using thread_safe 0.3.6
Using builder 3.2.4
Using erubi 1.10.0
Using mini_portile2 2.4.0
Using crass 1.0.6
Using rack 2.2.3
Using nio4r 2.5.4
Using websocket-extensions 0.1.5
Using mini_mime 1.0.2
Using jsonapi-renderer 0.2.2
Using arel 9.0.0
Using mimemagic 0.3.5
Using public_suffix 4.0.6
Using execjs 2.7.0
Using base32 0.3.4
Using bcrypt 3.1.16
Using msgpack 1.3.3
Using bundler 2.2.11
Using mini_magick 4.11.0
Using ffi 1.14.2
Using multi_json 1.15.0
Using carrierwave_backgrounder 0.0.2
Using excon 0.78.1
Using formatador 0.2.5
Using mime-types-data 3.2020.1104
Using ipaddress 0.8.3
Using coffee-script-source 1.12.2
Using method_source 1.0.0
Using thor 1.0.1
Using orm_adapter 0.5.0
Fetching unf_ext 0.0.7.7
Fetching dotenv 2.7.6
Using foreman 0.87.2
Using multi_xml 0.6.0
Using jwt 2.2.2
Using rotp 6.2.0
Using useragent 0.16.10
Using hashie 3.6.0
Fetching http-accept 1.7.0
Fetching netrc 0.11.0
Installing dotenv 2.7.6
Installing netrc 0.11.0
Installing http-accept 1.7.0
Using pg 1.2.3
Using puma 3.12.6
Using rb-fsevent 0.10.4
Using redis 4.2.5
Using tilt 2.0.10
Using semantic_range 2.3.1
Installing unf_ext 0.0.7.7 with native extensions
Fetching stripe 5.30.0
Using turbolinks-source 5.2.0
Using i18n 1.8.7
Using nokogiri 1.10.10
Using rack-test 1.1.0
Using websocket-driver 0.7.3
Using mail 2.7.1
Using marcel 0.3.3
Using addressable 2.7.0
Using autoprefixer-rails 10.2.0.0
Using bootsnap 1.5.1
Using warden 1.2.9
Using sprockets 3.7.2
Using rack-cors 1.1.1
Using rack-proxy 0.6.5
Installing stripe 5.30.0
Using uglifier 4.2.0
Using tzinfo 1.2.9
Using ruby-vips 2.0.17
Using streamio-ffmpeg 2.0.0
Using mime-types 3.3.1
Using coffee-script 2.4.1
Using sassc 2.4.0
Using rb-inotify 0.10.1
Using figaro 1.2.0
Using omniauth 1.9.0
Using loofah 2.8.0
Using turbolinks 5.2.1
Using activesupport 5.2.4.4
Using image_processing 1.12.1
Using fog-core 2.2.3
Using httparty 0.18.1
Using font-awesome-sass 5.15.1
Using sass-listen 4.0.0
Using rails-html-sanitizer 1.3.0
Using rails-dom-testing 2.0.3
Using globalid 0.4.2
Using activemodel 5.2.4.4
Using case_transform 0.2
Using groupdate 2.5.2
Using jsonapi-serializers 1.0.1
Using jbuilder 2.10.1
Using fog-json 1.2.0
Using fog-xml 0.1.3
Using actionview 5.2.4.4
Using activejob 5.2.4.4
Using activerecord 5.2.4.4
Using carrierwave 2.1.0
Using sass 3.7.4
Using actionpack 5.2.4.4
Using arel-helpers 2.12.0
Using carrierwave-video 0.6.0
Using carrierwave-video-thumbnailer 0.1.4
Using fog-aws 3.7.0
Using friendly_id 5.4.2
Using actioncable 5.2.4.4
Using actionmailer 5.2.4.4
Using active_model_serializers 0.10.10
Using activestorage 5.2.4.4
Using railties 5.2.4.4
Using sprockets-rails 3.2.2
Using carrierwave_direct 2.1.0
Using coffee-rails 4.2.2
Using responders 3.0.1
Using rails 5.2.4.4
Fetching dotenv-rails 2.7.6
Using sass-rails 5.1.0
Using webpacker 5.2.1
Using forest_liana 5.4.0
Using devise 4.7.3
Fetching devise_token_auth 1.1.5
Installing dotenv-rails 2.7.6
Installing devise_token_auth 1.1.5
Fetching unf 0.1.4
Installing unf 0.1.4
Fetching domain_name 0.5.20190701
Installing domain_name 0.5.20190701
Fetching http-cookie 1.0.3
Installing http-cookie 1.0.3
Fetching rest-client 2.1.0
Installing rest-client 2.1.0
Using mailjet 1.6.0 from https://github.com/mailjet/mailjet-gem.git (at master@675f75f)
Bundle complete! 48 Gemfile dependencies, 124 gems now installed.
Gems in the groups development and test were not installed.
Bundled gems are installed into `./vendor/bundle`
Removing bundler (2.1.4)
Removing devise_token_auth (1.1.3)
Removing simple_form (5.0.3)
Bundle completed (9.33s)
Cleaning up the bundler cache.
-----> Detecting rake tasks
-----> Preparing app for Rails asset pipeline
Running: rake assets:precompile
/tmp/build_e1471a4f/vendor/bundle/ruby/2.7.0/gems/activerecord-5.2.4.4/lib/active_record/type.rb:27: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/tmp/build_e1471a4f/vendor/bundle/ruby/2.7.0/gems/activerecord-5.2.4.4/lib/active_record/type/adapter_specific_registry.rb:9: warning: The called method `add_modifier' is defined here
/tmp/build_e1471a4f/vendor/bundle/ruby/2.7.0/gems/actionpack-5.2.4.4/lib/action_dispatch/middleware/stack.rb:37: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/tmp/build_e1471a4f/vendor/bundle/ruby/2.7.0/gems/actionpack-5.2.4.4/lib/action_dispatch/middleware/static.rb:111: warning: The called method `initialize' is defined here
/tmp/build_e1471a4f/vendor/bundle/ruby/2.7.0/gems/activemodel-5.2.4.4/lib/active_model/type/integer.rb:13: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/tmp/build_e1471a4f/vendor/bundle/ruby/2.7.0/gems/activemodel-5.2.4.4/lib/active_model/type/value.rb:8: warning: The called method `initialize' is defined here
/tmp/build_e1471a4f/vendor/bundle/ruby/2.7.0/gems/activerecord-5.2.4.4/lib/active_record/connection_adapters/postgresql/oid/specialized_string.rb:12: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/tmp/build_e1471a4f/vendor/bundle/ruby/2.7.0/gems/activemodel-5.2.4.4/lib/active_model/type/value.rb:8: warning: The called method `initialize' is defined here
yarn install v1.22.10
[1/4] Resolving packages...
[2/4] Fetching packages...
info fsevents@2.3.1: The platform "linux" is incompatible with this module.
info "fsevents@2.3.1" is an optional dependency and failed compatibility check. Excluding it from installation.
info fsevents@1.2.13: The platform "linux" is incompatible with this module.
info "fsevents@1.2.13" is an optional dependency and failed compatibility check. Excluding it from installation.
[3/4] Linking dependencies...
warning " > @babel/preset-react@7.12.10" has unmet peer dependency "@babel/core@^7.0.0-0".
warning "@babel/preset-react > @babel/plugin-transform-react-display-name@7.12.1" has unmet peer dependency "@babel/core@^7.0.0-0".
warning "@babel/preset-react > @babel/plugin-transform-react-jsx@7.12.12" has unmet peer dependency "@babel/core@^7.0.0-0".
warning "@babel/preset-react > @babel/plugin-transform-react-jsx-development@7.12.12" has unmet peer dependency "@babel/core@^7.0.0-0".
warning "@babel/preset-react > @babel/plugin-transform-react-pure-annotations@7.12.1" has unmet peer dependency "@babel/core@^7.0.0-0".
warning "@babel/preset-react > @babel/plugin-transform-react-jsx > @babel/plugin-syntax-jsx@7.12.1" has unmet peer dependency "@babel/core@^7.0.0-0".
warning " > @bumaga/tabs@0.2.0" has incorrect peer dependency "react@^16.8.0".
warning " > @bumaga/tabs@0.2.0" has incorrect peer dependency "react-dom@^16.8.0".
warning " > react-stripe-elements@6.1.2" has incorrect peer dependency "react@^15.5.4 || ^16.0.0-0".
warning " > react-stripe-elements@6.1.2" has incorrect peer dependency "react-dom@^15.5.4 || ^16.0.0-0".
warning " > redux-form@8.3.7" has incorrect peer dependency "react@^16.4.2".
warning " > webpack-dev-server@3.11.1" has unmet peer dependency "webpack@^4.0.0 || ^5.0.0".
warning "webpack-dev-server > webpack-dev-middleware@3.7.3" has unmet peer dependency "webpack@^4.0.0 || ^5.0.0".
[4/4] Building fresh packages...
Done in 51.78s.
I, [2021-03-17T11:29:21.549633 #3503] INFO -- : Writing /tmp/build_e1471a4f/public/assets/adhesion-b7f06c2d9ff4f288a034bc9110a5e730795b0207b75984d4483e6219b43bb0d1.svg
I, [2021-03-17T11:29:21.550575 #3503] INFO -- : Writing /tmp/build_e1471a4f/public/assets/adhesion-b7f06c2d9ff4f288a034bc9110a5e730795b0207b75984d4483e6219b43bb0d1.svg.gz
I, [2021-03-17T11:29:24.153962 #3503] INFO -- : Writing /tmp/build_e1471a4f/public/assets/README-e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.md
I, [2021-03-17T11:29:30.200009 #3503] INFO -- : Writing /tmp/build_e1471a4f/public/assets/application-7a44779857db323d1bc9ccf63db9914a5ce8ff8d23f6f9beb9853fb60ff66e8c.css
I, [2021-03-17T11:29:30.200642 #3503] INFO -- : Writing /tmp/build_e1471a4f/public/assets/application-7a44779857db323d1bc9ccf63db9914a5ce8ff8d23f6f9beb9853fb60ff66e8c.css.gz
Compiling...
Compilation failed:
CssSyntaxError: /tmp/build_e1471a4f/css/Routes-f5978686.css:900:4437: Missed semicolon
at Input.error (/tmp/build_e1471a4f/node_modules/postcss/lib/input.js:128:16)
at Parser.checkMissedSemicolon (/tmp/build_e1471a4f/node_modules/postcss/lib/parser.js:601:22)
at Parser.decl (/tmp/build_e1471a4f/node_modules/postcss/lib/parser.js:284:46)
at Parser.other (/tmp/build_e1471a4f/node_modules/postcss/lib/parser.js:164:12)
at Parser.parse (/tmp/build_e1471a4f/node_modules/postcss/lib/parser.js:75:16)
at parse (/tmp/build_e1471a4f/node_modules/postcss/lib/parse.js:17:12)
at new LazyResult (/tmp/build_e1471a4f/node_modules/postcss/lib/lazy-result.js:64:16)
at Processor.<anonymous> (/tmp/build_e1471a4f/node_modules/postcss/lib/processor.js:142:12)
at Processor.process (/tmp/build_e1471a4f/node_modules/postcss/lib/processor.js:121:23)
at Function.creator.process (/tmp/build_e1471a4f/node_modules/postcss/lib/postcss.js:148:43)
at OptimizeCssAssetsWebpackPlugin.processCss (/tmp/build_e1471a4f/node_modules/optimize-css-assets-webpack-plugin/src/index.js:73:21)
at Object.processor (/tmp/build_e1471a4f/node_modules/optimize-css-assets-webpack-plugin/src/index.js:13:18)
at /tmp/build_e1471a4f/node_modules/last-call-webpack-plugin/src/index.js:150:10
at arrayEach (/tmp/build_e1471a4f/node_modules/lodash/_arrayEach.js:15:9)
at forEach (/tmp/build_e1471a4f/node_modules/lodash/forEach.js:38:10)
at OptimizeCssAssetsWebpackPlugin.process (/tmp/build_e1471a4f/node_modules/last-call-webpack-plugin/src/index.js:147:5)
at /tmp/build_e1471a4f/node_modules/last-call-webpack-plugin/src/index.js:178:28
at AsyncSeriesHook.eval [as callAsync] (eval at create (/tmp/build_e1471a4f/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:22:17)
at AsyncSeriesHook.lazyCompileHook (/tmp/build_e1471a4f/node_modules/tapable/lib/Hook.js:154:20)
at /tmp/build_e1471a4f/node_modules/webpack/lib/Compilation.js:1409:36
at AsyncSeriesHook.eval [as callAsync] (eval at create (/tmp/build_e1471a4f/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:6:1)
at AsyncSeriesHook.lazyCompileHook (/tmp/build_e1471a4f/node_modules/tapable/lib/Hook.js:154:20)
at /tmp/build_e1471a4f/node_modules/webpack/lib/Compilation.js:1405:32
at AsyncSeriesHook.eval [as callAsync] (eval at create (/tmp/build_e1471a4f/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:6:1)
at AsyncSeriesHook.lazyCompileHook (/tmp/build_e1471a4f/node_modules/tapable/lib/Hook.js:154:20)
at Compilation.seal (/tmp/build_e1471a4f/node_modules/webpack/lib/Compilation.js:1342:27)
at /tmp/build_e1471a4f/node_modules/webpack/lib/Compiler.js:675:18
at /tmp/build_e1471a4f/node_modules/webpack/lib/Compilation.js:1261:4
at AsyncSeriesHook.eval [as callAsync] (eval at create (/tmp/build_e1471a4f/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:24:1)
at AsyncSeriesHook.lazyCompileHook (/tmp/build_e1471a4f/node_modules/tapable/lib/Hook.js:154:20)
at Compilation.finish (/tmp/build_e1471a4f/node_modules/webpack/lib/Compilation.js:1253:28)
at /tmp/build_e1471a4f/node_modules/webpack/lib/Compiler.js:672:17
at _done (eval at create (/tmp/build_e1471a4f/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:9:1)
at eval (eval at create (/tmp/build_e1471a4f/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:620:22)
at /tmp/build_e1471a4f/node_modules/webpack/lib/Compilation.js:1185:12
at /tmp/build_e1471a4f/node_modules/webpack/lib/Compilation.js:1097:9
!
! Precompiling assets failed.
!
! Push rejected, failed to compile Ruby app.
! Push failed
我尝试了很多事情：
- 删除一些最近的包
- 检查每一行代码并更新所有缺少分号的 JS 和 SCSS 文件
- 删除 heroku buildpack 并重新添加它们。
- 创建一个新的 Heroku 应用
所有这些尝试都给了我同样的错误。
我真的不知道在哪里搜索了。
提前感谢您的帮助。
乔
这里有一些文件可以帮助您随时向我询问更多输出或文件。
Package.json
{
"name": "testapp",
"private": true,
"dependencies": {
"@babel/preset-react": "^7.12.10",
"@bumaga/tabs": "^0.2.0",
"@fortawesome/fontawesome-svg-core": "^1.2.34",
"@fortawesome/free-solid-svg-icons": "^5.15.2",
"@fortawesome/react-fontawesome": "^0.1.14",
"@rails/webpacker": "5.2.1",
"axios": "^0.21.1",
"babel-plugin-transform-react-remove-prop-types": "^0.4.24",
"final-form": "^4.20.1",
"history": "^5.0.0",
"j-toker": "^0.0.10-beta3",
"jquery": "^3.5.1",
"jquery-deparam": "^0.5.3",
"jquery.cookie": "^1.4.1",
"moment": "^2.29.1",
"pdfmake": "^0.1.70",
"polyfill": "^0.1.0",
"prop-types": "^15.7.2",
"pubsub-js": "^1.9.2",
"query-string": "^6.14.1",
"react": "^17.0.1",
"react-app-polyfill": "^2.0.0",
"react-content-loader": "^6.0.1",
"react-datepicker": "^3.6.0",
"react-dom": "^17.0.1",
"react-dropzone": "^11.3.1",
"react-final-form": "^6.5.2",
"react-helmet": "^6.1.0",
"react-modal": "^3.12.1",
"react-redux": "^7.2.2",
"react-router": "^5.2.0",
"react-router-dom": "^5.2.0",
"react-share": "^4.3.1",
"react-stripe-elements": "^6.1.2",
"redux": "^4.0.5",
"redux-form": "^8.3.7",
"redux-logger": "^3.0.6",
"redux-promise": "^0.6.0",
"redux-thunk": "^2.3.0",
"script-loader": "^0.7.2"
},
"devDependencies": {
"webpack-dev-server": "^3.11.1"
}
}
【问题讨论】：
-
在生产环境中，资产使用 RAILS_ENV=production 进行预编译。在本地运行它，看看它是否通过：
NODE_ENV=production ./bin/webpack -
或在
webpacker.yml中设置compile: true为development。在预编译步骤引发错误 -
感谢您的回复。我跑了
NODE_ENV=production ./bin/webpack，它顺利通过了。对于您的第二条评论，从一开始compile就在true上为development -
创建一个新的 heroku 应用程序并在没有失败的 css 的情况下进行部署。缩小问题范围。
标签： ruby-on-rails reactjs heroku webpack webpacker