JavaScript heap out of memory

[richstokes]

Running on Ubuntu 18, 8GB memory - although physical memory doesn't seem to get maxed out at any point I am getting:

<--- Last few GCs --->

[2916:0x19ce040]    92376 ms: Mark-sweep 1324.4 (1436.1) -> 1324.3 (1404.6) MB, 21.5 / 0.0 ms  (average mu = 0.363, current mu = 0.001) last resort GC in old space requested
[2916:0x19ce040]    92402 ms: Mark-sweep 1324.3 (1404.6) -> 1324.3 (1404.6) MB, 26.3 / 0.0 ms  (average mu = 0.196, current mu = 0.001) last resort GC in old space requested


<--- JS stacktrace --->

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

    0: ExitFrame [pc: 0x39c0b3cd452b]
Security context: 0x0bf5ed3aede9 <JSObject>
    1: charCodeAt [0xbf5ed3b3b29](this=0x296a1984aee9 <Very long string[403780224]>,0)
    2: writeBlockMapping(aka writeBlockMapping) [0x365b3176eaf1] [/home/osboxes/bruteforce-helloworld/node_modules/js-yaml/lib/js-yaml/dumper.js:638] [bytecode=0xc3732cce109 offset=397](this=0x0dd8fbf825d9 <undefined>,state=0x2616779c4c19 <State map = 0x3615af1d50e1>,level...

FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - JavaScript heap out of memory
 1: 0x7fbcca33b568 node::Abort() [/usr/lib/x86_64-linux-gnu/libnode.so.64]
 2: 0x7fbcca33b5b1  [/usr/lib/x86_64-linux-gnu/libnode.so.64]
 3: 0x7fbcca4fcd22 v8::Utils::ReportOOMFailure(v8::internal::Isolate*, char const*, bool) [/usr/lib/x86_64-linux-gnu/libnode.so.64]
 4: 0x7fbcca4fcf78 v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, bool) [/usr/lib/x86_64-linux-gnu/libnode.so.64]
 5: 0x7fbcca87e5f2  [/usr/lib/x86_64-linux-gnu/libnode.so.64]
 6: 0x7fbcca892197 v8::internal::Heap::AllocateRawWithRetryOrFail(int, v8::internal::AllocationSpace, v8::internal::AllocationAlignment) [/usr/lib/x86_64-linux-gnu/libnode.so.64]
 7: 0x7fbcca860749 v8::internal::Factory::AllocateRawWithImmortalMap(int, v8::internal::PretenureFlag, v8::internal::Map*, v8::internal::AllocationAlignment) [/usr/lib/x86_64-linux-gnu/libnode.so.64]
 8: 0x7fbcca867b31 v8::internal::Factory::NewRawTwoByteString(int, v8::internal::PretenureFlag) [/usr/lib/x86_64-linux-gnu/libnode.so.64]
 9: 0x7fbcca992285 v8::internal::String::SlowFlatten(v8::internal::Handle<v8::internal::ConsString>, v8::internal::PretenureFlag) [/usr/lib/x86_64-linux-gnu/libnode.so.64]
10: 0x7fbccab1c472 v8::internal::Runtime_StringCharCodeAt(int, v8::internal::Object**, v8::internal::Isolate*) [/usr/lib/x86_64-linux-gnu/libnode.so.64]
11: 0x39c0b3cd452b 

After recording (Press CTRL+D, wait a few seconds, get this ^^)