Causing JavaScript heap to run out of memory on Travis

[cjancsar]

Trying to add this library to our UI project which is being testing on travis.

We are getting the following error:

<--- Last few GCs --->
[8802:0x41646f0]    79347 ms: Mark-sweep 1312.7 (1443.5) -> 1299.8 (1443.0) MB, 1424.0 / 0.2 ms  (average mu = 0.256, current mu = 0.227) allocation failure scavenge might not succeed
[8802:0x41646f0]    81159 ms: Mark-sweep 1314.4 (1443.0) -> 1301.0 (1443.0) MB, 1528.8 / 0.1 ms  (average mu = 0.207, current mu = 0.156) allocation failure scavenge might not succeed
<--- JS stacktrace --->
==== JS stack trace =========================================
    0: ExitFrame [pc: 0x2d4c9985be1d]
    1: StubFrame [pc: 0x2d4c99811034]
Security context: 0x1e033831e6e9 <JSObject>
    2: relative [0x1918222457c9] [path.js:~1161] [pc=0x2d4c99e75c2b](this=0x191822202201 <Object map = 0x360feb4b8969>,from=0x1fb8ed0f2cb1 <String[40]: /home/travis/build/h2-/ui>,to=0x3e4d003a71b1 <String[82]: /home/travis/build/h2-/ui/node_modules/source-map/lib/quick-sort.js>)
    3: shoul...
FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory
 1: 0x8f9d10 node::Abort() [/home/travis/.nvm/versions/node/v10.16.0/bin/node]
 2: 0x8f9d5c  [/home/travis/.nvm/versions/node/v10.16.0/bin/node]
 3: 0xaffd0e v8::Utils::ReportOOMFailure(v8::internal::Isolate*, char const*, bool) [/home/travis/.nvm/versions/node/v10.16.0/bin/node]
 4: 0xafff44 v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, bool) [/home/travis/.nvm/versions/node/v10.16.0/bin/node]
 5: 0xef4152  [/home/travis/.nvm/versions/node/v10.16.0/bin/node]
 6: 0xef4258 v8::internal::Heap::CheckIneffectiveMarkCompact(unsigned long, double) [/home/travis/.nvm/versions/node/v10.16.0/bin/node]
 7: 0xf00332 v8::internal::Heap::PerformGarbageCollection(v8::internal::GarbageCollector, v8::GCCallbackFlags) [/home/travis/.nvm/versions/node/v10.16.0/bin/node]
 8: 0xf00c64 v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) [/home/travis/.nvm/versions/node/v10.16.0/bin/node]
 9: 0xf038d1 v8::internal::Heap::AllocateRawWithRetryOrFail(int, v8::internal::AllocationSpace, v8::internal::AllocationAlignment) [/home/travis/.nvm/versions/node/v10.16.0/bin/node]
10: 0xeccd54 v8::internal::Factory::NewFillerObject(int, bool, v8::internal::AllocationSpace) [/home/travis/.nvm/versions/node/v10.16.0/bin/node]
11: 0x116cede v8::internal::Runtime_AllocateInNewSpace(int, v8::internal::Object**, v8::internal::Isolate*) [/home/travis/.nvm/versions/node/v10.16.0/bin/node]
12: 0x2d4c9985be1d 
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.