How to fix "FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory" error : <p>I'm trying to deploy a reactjs application to heroku. While compiling assets, the build fails and produces this error:</p>

<pre><code>-----&gt; Ruby app detected
-----&gt; Compiling Ruby/Rails
-----&gt; Using Ruby version: ruby-2.5.1
-----&gt; Installing dependencies using bundler 1.15.2
       Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment
       Warning: the running version of Bundler (1.15.2) is older than the version that created the lockfile (1.16.3). We suggest you upgrade to the latest version of Bundler by running `gem install bundler`.
       Fetching gem metadata from https://rubygems.org/............
       Fetching version metadata from https://rubygems.org/..
       Fetching dependency metadata from https://rubygems.org/.
       Using rake 12.3.1
       Using concurrent-ruby 1.1.3
       Using minitest 5.11.3
       Using thread_safe 0.3.6
       Using builder 3.2.3
       Using erubi 1.7.1
       Using mini_portile2 2.3.0
       Using crass 1.0.4
       Using rack 2.0.6
       Using nio4r 2.3.1
       Using websocket-extensions 0.1.3
       Using mini_mime 1.0.1
       Using jsonapi-renderer 0.2.0
       Using arel 9.0.0
       Using mimemagic 0.3.2
       Using public_suffix 3.0.3
       Using airbrake-ruby 2.12.0
       Using execjs 2.7.0
       Using bcrypt 3.1.12
       Using popper_js 1.14.5
       Using rb-fsevent 0.10.3
       Using ffi 1.9.25
       Using bundler 1.15.2
       Using regexp_parser 1.3.0
       Using mime-types-data 3.2018.0812
       Using chartkick 3.0.1
       Using highline 2.0.0
       Using connection_pool 2.2.2
       Using orm_adapter 0.5.0
       Using method_source 0.9.2
       Using thor 0.19.4
       Using multipart-post 2.0.0
       Using geokit 1.13.1
       Using temple 0.8.0
       Using tilt 2.0.9
       Using hashie 3.5.7
       Using json 2.1.0
       Using mini_magick 4.9.2
       Using multi_json 1.13.1
       Using newrelic_rpm 5.5.0.348
       Using one_signal 1.2.0
       Using xml-simple 1.1.5
       Using pg 0.21.0
       Using puma 3.12.0
       Using rack-timeout 0.5.1
       Using redis 4.0.3
       Using secure_headers 6.0.0
       Using swagger-ui_rails 0.1.7
       Using i18n 1.1.1
       Using nokogiri 1.8.5
       Using tzinfo 1.2.5
       Using websocket-driver 0.7.0
       Using mail 2.7.1
       Using marcel 0.3.3
       Using addressable 2.5.2
       Using rack-test 1.1.0
       Using warden 1.2.8
       Using sprockets 3.7.2
       Using request_store 1.4.1
       Using rack-protection 2.0.4
       Using rack-proxy 0.6.5
       Using autoprefixer-rails 9.4.2
       Using uglifier 4.1.20
       Using airbrake 7.4.0
       Using rb-inotify 0.9.10
       Using mime-types 3.2.2
       Using commander 4.4.7
       Using net-http-persistent 3.0.0
       Using faraday 0.15.4
       Using hashie-forbidden_attributes 0.1.1
       Using omniauth 1.8.1
       Using haml 5.0.4
       Using slim 4.0.1
       Using paypal-sdk-core 0.3.4
       Using faker 1.9.1 from https://github.com/stympy/faker.git (at master@aca03be)
       Using money 6.13.1
       Using loofah 2.2.3
       Using xpath 3.2.0
       Using activesupport 5.2.0
       Using sidekiq 5.2.3
       Using sass-listen 4.0.0
       Using houston 2.4.0
       Using stripe 4.2.0
       Using paypal-sdk-adaptivepayments 1.117.1
       Using monetize 1.9.0
       Using rails-html-sanitizer 1.0.4
       Using capybara 3.12.0
       Using rails-dom-testing 2.0.3
       Using globalid 0.4.1
       Using activemodel 5.2.0
       Using case_transform 0.2
       Using decent_exposure 3.0.0
       Using factory_bot 4.11.1
       Using fast_jsonapi 1.5
       Using groupdate 4.1.0
       Using pundit 2.0.0
       Using sass 3.7.2
       Using actionview 5.2.0
       Using activerecord 5.2.0
       Using carrierwave 1.2.3
       Using activejob 5.2.0
       Using actionpack 5.2.0
       Using bootstrap 4.1.3
       Using actioncable 5.2.0
       Using actionmailer 5.2.0
       Using active_model_serializers 0.10.8
       Using activestorage 5.2.0
       Using railties 5.2.0
       Using sprockets-rails 3.2.1
       Using simple_form 4.1.0
       Using responders 2.4.0
       Using factory_bot_rails 4.11.1
       Using font-awesome-rails 4.7.0.4
       Using highcharts-rails 6.0.3
       Using jquery-rails 4.3.3
       Using lograge 0.10.0
       Using money-rails 1.13.0
       Using slim-rails 3.2.0
       Using webpacker 3.5.5
       Using rails 5.2.0
       Using sass-rails 5.0.7
       Using geokit-rails 2.3.1
       Using swagger-docs 0.2.9
       Using devise 4.5.0
       Using devise_token_auth 1.0.0
       Bundle complete! 68 Gemfile dependencies, 125 gems now installed.
       Gems in the groups development and test were not installed.
       Bundled gems are installed into ./vendor/bundle.
       Bundle completed (5.09s)
       Cleaning up the bundler cache.
       Warning: the running version of Bundler (1.15.2) is older than the version that created the lockfile (1.16.3). We suggest you upgrade to the latest version of Bundler by running `gem install bundler`.
       The latest bundler is 2.0.1, but you are currently running 1.15.2.
       To update, run `gem install bundler`
-----&gt; Installing node-v10.14.1-linux-x64
-----&gt; Installing yarn-v1.12.3
-----&gt; Detecting rake tasks
-----&gt; Preparing app for Rails asset pipeline
       Running: rake assets:precompile
       yarn install v1.12.3
       warning package-lock.json found. Your project contains lock files generated by tools other than Yarn. It is advised not to mix package managers in order to avoid resolution inconsistencies caused by unsynchronized lock files. To clear this warning, remove package-lock.json.
       [1/5] Validating package.json...
       [2/5] Resolving packages...
       [3/5] Fetching packages...
       info fsevents@1.2.4: The platform "linux" is incompatible with this module.
       info "fsevents@1.2.4" is an optional dependency and failed compatibility check. Excluding it from installation.
       [4/5] Linking dependencies...
       warning "@rails/webpacker &gt; postcss-cssnext@3.1.0" has unmet peer dependency "caniuse-lite@^1.0.30000697".
       warning " &gt; react-addons-css-transition-group@15.6.2" has incorrect peer dependency "react@^15.4.2".
       warning " &gt; react-bootstrap-table-next@1.4.0" has unmet peer dependency "classnames@^2.2.5".
       warning " &gt; react-progressbar@15.4.1" has incorrect peer dependency "react@^15.0.1".
       warning " &gt; redux-immutable@4.0.0" has unmet peer dependency "immutable@^3.8.1 || ^4.0.0-rc.1".
       warning "eslint-config-airbnb &gt; eslint-config-airbnb-base@11.3.2" has incorrect peer dependency "eslint-plugin-import@^2.7.0".
       warning " &gt; webpack-dev-server@2.11.2" has unmet peer dependency "webpack@^2.2.0 || ^3.0.0".
       warning "webpack-dev-server &gt; webpack-dev-middleware@1.12.2" has unmet peer dependency "webpack@^1.0.0 || ^2.0.0 || ^3.0.0".
       [5/5] Building fresh packages...
       $ cd client &amp;&amp; yarn
       yarn install v1.12.3
       warning package-lock.json found. Your project contains lock files generated by tools other than Yarn. It is advised not to mix package managers in order to avoid resolution inconsistencies caused by unsynchronized lock files. To clear this warning, remove package-lock.json.
       [1/5] Validating package.json...
       [2/5] Resolving packages...
       [3/5] Fetching packages...
       info fsevents@1.2.4: The platform "linux" is incompatible with this module.
       info "fsevents@1.2.4" is an optional dependency and failed compatibility check. Excluding it from installation.
       [4/5] Linking dependencies...
       warning " &gt; babel-loader@7.1.0" has unmet peer dependency "webpack@2 || 3".
       warning " &gt; react-intl@2.3.0" has incorrect peer dependency "react@^0.14.9 || ^15.0.0".
       warning " &gt; react-router-dom@4.1.1" has incorrect peer dependency "react@^15".
       warning " &gt; react-router-redux@5.0.0-alpha.6" has incorrect peer dependency "react@^15".
       warning " &gt; enzyme@2.8.2" has incorrect peer dependency "react@0.13.x || 0.14.x || ^15.0.0-0 || 15.x".
       warning " &gt; eslint-import-resolver-webpack@0.8.3" has unmet peer dependency "webpack@&gt;=1.11.0".
       warning " &gt; html-webpack-plugin@2.29.0" has unmet peer dependency "webpack@1 || ^2 || ^2.1.0-beta || ^2.2.0-rc || ^3".
       warning "image-webpack-loader &gt; file-loader@1.1.11" has unmet peer dependency "webpack@^2.0.0 || ^3.0.0 || ^4.0.0".
       warning " &gt; react-test-renderer@15.6.1" has incorrect peer dependency "react@^15.6.1".
       [5/5] Building fresh packages...
       Done in 31.85s.
       Done in 76.09s.
       Webpacker is installed 🎉 🍰
       Using /tmp/build_8f521e11fc612876bcd3c01cd8da6bdd/config/webpacker.yml file for setting up webpack paths
       Compiling…
       Compilation failed:
       FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory
        1: 0x8dbaa0 node::Abort() [node]
        2: 0x8dbaec  [node]
        3: 0xad83de v8::Utils::ReportOOMFailure(v8::internal::Isolate*, char const*, bool) [node]
        4: 0xad8614 v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, bool) [node]
        5: 0xec5c42  [node]
        6: 0xec5d48 v8::internal::Heap::CheckIneffectiveMarkCompact(unsigned long, double) [node]
        7: 0xed1e22 v8::internal::Heap::PerformGarbageCollection(v8::internal::GarbageCollector, v8::GCCallbackFlags) [node]
        8: 0xed2754 v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) [node]
        9: 0xed53c1 v8::internal::Heap::AllocateRawWithRetryOrFail(int, v8::internal::AllocationSpace, v8::internal::AllocationAlignment) [node]
       10: 0xe9e844 v8::internal::Factory::NewFillerObject(int, bool, v8::internal::AllocationSpace) [node]
       11: 0x113dfae v8::internal::Runtime_AllocateInNewSpace(int, v8::internal::Object**, v8::internal::Isolate*) [node]
       12: 0x2daefc5be1d 


       &lt;--- Last few GCs ---&gt;

       [587:0x2713f20]  1469419 ms: Mark-sweep 1362.0 (1417.7) -&gt; 1361.9 (1418.2) MB, 1183.8 / 0.0 ms  (average mu = 0.099, current mu = 0.004) allocation failure scavenge might not succeed
       [587:0x2713f20]  1470575 ms: Mark-sweep 1363.1 (1418.7) -&gt; 1362.9 (1419.7) MB, 1151.7 / 0.0 ms  (average mu = 0.053, current mu = 0.004) allocation failure scavenge might not succeed


       &lt;--- JS stacktrace ---&gt;

       ==== JS stack trace =========================================

           0: ExitFrame [pc: 0x2daefc5be1d]
       Security context: 0x395bbaa1e6e1 &lt;JSObject&gt;
           1: addMappingWithCode [0x1a4bb3f1a89] [/tmp/build_8f521e11fc612876bcd3c01cd8da6bdd/node_modules/webpack-sources/node_modules/source-map/lib/source-node.js:~150] [pc=0x2daf487dfd2](this=0x08663a09ad49 &lt;JSGlobal Object&gt;,mapping=0x2969e26a1e61 &lt;Object map = 0x1067d74ad2e1&gt;,code=0x3e38d99f4479 &lt;String[6]: break &gt;)
           2: /* anonymous */ [0x1a4bb3dcc79] [/tmp/...


 !
 !     Precompiling assets failed.
 !
 !     Push rejected, failed to compile Ruby app.
 !     Push failed

</code></pre>

<p>I've tried various methods in my <code>package.json</code> file:</p>

<pre><code>"scripts" : {
   "start": "cross-env NODE_OPTIONS=--max_old_space_size=5120 webpack"
}

"scripts" : {
  "webpacker": "node --max-old-space-size=4096 node_modules/.bin/react-scripts start"
}

"scripts" : {
  "start": "node --max-old-space-size=6144 client/app/app.js"
}

</code></pre>

<p>I've researched and found various github and stackoverflow threads but they do not seem to fix my issue.</p>

<ul>
<li><a href="https://github.com/npm/npm/issues/12238" rel="noreferrer">https://github.com/npm/npm/issues/12238</a></li>
<li><a href="https://stackoverflow.com/questions/44046366/increase-javascript-heap-size-in-create-react-app-project">Increase JavaScript Heap size in create-react-app project</a></li>
</ul>

<p>Here is my <code>package.json</code> file:</p>

<pre><code>{
  "name": "safe_deliver",
  "private": true,
  "engines": {
    "node": "&gt;=6.0.0",
    "yarn": "&gt;=0.25.2"
  },
  "scripts": {
    "postinstall": "cd client &amp;&amp; yarn",
    "pre-commit": "cd client &amp;&amp; npm run lint:staged",
    "start": "cross-env NODE_OPTIONS=--max-old-space-size=6144 bin/webpack"
  },
  "dependencies": {
    "@fortawesome/fontawesome": "^1.1.8",
    "@fortawesome/fontawesome-free": "^5.3.1",
    "@fortawesome/fontawesome-free-brands": "^5.0.13",
    "@fortawesome/fontawesome-free-regular": "^5.0.13",
    "@fortawesome/fontawesome-free-solid": "^5.0.13",
    "@fortawesome/fontawesome-svg-core": "^1.2.4",
    "@fortawesome/free-solid-svg-icons": "^5.3.1",
    "@fortawesome/react-fontawesome": "^0.1.3",
    "@rails/webpacker": "^3.3.1",
    "babel-plugin-emotion": "^9.2.6",
    "babel-preset-react": "^6.24.1",
    "babel-preset-stage-0": "^6.24.1",
    "bootstrap": "4.0.0",
    "chart.js": "^2.7.3",
    "chartkick": "^3.0.1",
    "emotion": "^9.2.6",
    "google-maps-react": "^2.0.2",
    "jquery": "^3.2.1",
    "jquery-ujs": "^1.2.2",
    "leaflet": "^1.3.1",
    "normalize.css": "^8.0.1",
    "popper.js": "^1.12.9",
    "prop-types": "^15.6.1",
    "rc-time-picker": "^3.6.2",
    "react": "^16.4.1",
    "react-addons-css-transition-group": "^15.6.2",
    "react-animate-height": "^2.0.5",
    "react-bootstrap-table-next": "^1.4.0",
    "react-calendar": "^2.16.0",
    "react-datepicker": "^2.3.0",
    "react-dom": "^16.4.1",
    "react-emotion": "^9.2.6",
    "react-fontawesome": "^1.6.1",
    "react-geocode": "^0.1.2",
    "react-https-redirect": "^1.0.11",
    "react-input-mask": "^2.0.4",
    "react-progressbar": "^15.4.1",
    "react-star-rating-component": "^1.4.1",
    "react-stripe-elements": "^2.0.1",
    "reactjs-popup": "^1.3.2",
    "redux-immutable": "^4.0.0",
    "reset-css": "^4.0.1",
    "seamless-immutable": "^7.1.4",
    "styled-components": "^3.4.2"
  },
  "devDependencies": {
    "eslint": "3.19.0",
    "eslint-config-airbnb": "15.0.1",
    "eslint-plugin-import": "2.2.0",
    "eslint-plugin-jsx-a11y": "5.0.3",
    "eslint-plugin-react": "7.0.1",
    "pre-commit": "1.2.2",
    "webpack-dev-server": "^2.7.1"
  }
}

</code></pre>

<p>I am expecting this error to go away and the application to be deployed. Right now it is throwing javascript heap out of memory error.</p>
