$ git push dokku test:master
Counting objects: 2366, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (1723/1723), done.
Writing objects: 100% (2366/2366), 15.11 MiB | 1.64 MiB/s, done.
Total 2366 (delta 1705), reused 871 (delta 576)
-----> Cleaning up...
-----> Building ui from herokuish...
-----> Adding BUILD_ENV to build environment...
-----> Node.js app detected

-----> Creating runtime environment

       NPM_CONFIG_LOGLEVEL=error
       NODE_VERBOSE=false
       NODE_ENV=production
       NODE_MODULES_CACHE=true

-----> Installing binaries
       engines.node (package.json):  ^8.1.4
       engines.npm (package.json):   unspecified (use default)

       Resolving node version ^8.1.4...
       Downloading and installing node 8.11.1...
       Using default npm version: 5.6.0

-----> Restoring cache
       Skipping cache restore (not-found)

-----> Building dependencies
       Installing node modules (package.json + package-lock)

       > [email protected] install /tmp/build/node_modules/node-sass
       > node scripts/install.js

       Downloading binary from https://github.com/sass/node-sass/releases/download/v4.7.2/linux-x64-57_binding.node
       Download complete
       Binary saved to /tmp/build/node_modules/node-sass/vendor/linux-x64-57/binding.node
       Caching binary to /tmp/npmcache.niTvN/node-sass/4.7.2/linux-x64-57_binding.node

       > [email protected] postinstall /tmp/build/node_modules/node-sass
       > node scripts/build.js

       Binary found at /tmp/build/node_modules/node-sass/vendor/linux-x64-57/binding.node
       Testing binary
       Binary is fine

       > [email protected] postinstall /tmp/build
       > if [ "$NODE_ENV" = "production" ]; then npm run build-assets; fi


       > [email protected] build-assets /tmp/build
       > webpack -p --config webpack/prod.config.js --mode production


       <--- Last few GCs --->

       [318:0x2a12730]   253850 ms: Scavenge 292.9 (406.5) -> 282.0 (407.0) MB, 149.3 / 6.0 ms  allocation failure
       [318:0x2a12730]   256843 ms: Scavenge 293.2 (407.0) -> 284.4 (407.0) MB, 355.1 / 9.9 ms  allocation failure
       [318:0x2a12730]   259157 ms: Scavenge 301.4 (412.4) -> 297.3 (412.9) MB, 403.4 / 22.4 ms  allocation failure
       [318:0x2a12730]   261987 ms: Scavenge 310.0 (417.3) -> 308.5 (417.3) MB, 1075.1 / 6.0 ms  allocation failure


       <--- JS stacktrace --->
       Cannot get stack trace in GC.
       FATAL ERROR: NewSpace::Rebalance Allocation failed - process out of memory
       1: node::Abort() [node]
       2: 0x11e7fec [node]
       3: v8::Utils::ReportOOMFailure(char const*, bool) [node]
       4: v8::internal::V8::FatalProcessOutOfMemory(char const*, bool) [node]
       5: 0xad2f0b [node]
       6: v8::internal::MarkCompactCollector::Evacuate() [node]
       7: v8::internal::MarkCompactCollector::CollectGarbage() [node]
       8: v8::internal::Heap::MarkCompact() [node]
       9: v8::internal::Heap::PerformGarbageCollection(v8::internal::GarbageCollector, v8::GCCallbackFlags) [node]
       10: v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) [node]
       11: v8::internal::Factory::NewUninitializedFixedArray(int) [node]
       12: 0xdee74c [node]
       13: 0xdf8cf8 [node]
       14: 0xdf92ab [node]
       15: v8::internal::JSArray::SetLength(v8::internal::Handle<v8::internal::JSArray>, unsigned int) [node]
       16: v8::internal::ArrayConstructInitializeElements(v8::internal::Handle<v8::internal::JSArray>, v8::internal::Arguments*) [node]
       17: v8::internal::Runtime_NewArray(int, v8::internal::Object**, v8::internal::Isolate*) [node]
       18: 0x48244f842fd