npm install will fail with node 12

[eroncanc]

nodejs/nan#849

npm install after a fresh brew install node will fail due to above issue.

Bug reports must include:

• Operating system and version macOS
• Browser and version n/a

In file included from ../../nan/nan_converters.h:67:
../../nan/nan_converters_43_inl.h:22:1: warning: 'ToBoolean' is deprecated:
      ToBoolean can never throw. Use Local version. [-Wdeprecated-declarations]
X(Boolean)
^
../../nan/nan_converters_43_inl.h:18:12: note: expanded from macro 'X'
      val->To ## TYPE(isolate->GetCurrentContext())                            \
           ^
<scratch space>:30:1: note: expanded from here
ToBoolean
^
/Users/eroncancio/.node-gyp/12.1.0/include/node/v8.h:2523:3: note: 'ToBoolean'
      has been explicitly marked deprecated here
  V8_DEPRECATE_SOON("ToBoolean can never throw. Use Local version.",
  ^
/Users/eroncancio/.node-gyp/12.1.0/include/node/v8config.h:322:29: note:
      expanded from macro 'V8_DEPRECATE_SOON'
  declarator __attribute__((deprecated(message)))
                            ^
In file included from ../src/binding.cpp:1:
In file included from ../../nan/nan.h:222:
In file included from ../../nan/nan_converters.h:67:
../../nan/nan_converters_43_inl.h:40:1: warning: 'BooleanValue' is deprecated:
      BooleanValue can never throw. Use Isolate version.
      [-Wdeprecated-declarations]
X(bool, Boolean)
^
../../nan/nan_converters_43_inl.h:37:15: note: expanded from macro 'X'
  return val->NAME ## Value(isolate->GetCurrentContext());                     \
              ^
<scratch space>:37:1: note: expanded from here
BooleanValue
^
/Users/eroncancio/.node-gyp/12.1.0/include/node/v8.h:2561:3: note:
      'BooleanValue' has been explicitly marked deprecated here
  V8_DEPRECATED("BooleanValue can never throw. Use Isolate version.",
  ^
/Users/eroncancio/.node-gyp/12.1.0/include/node/v8config.h:307:29: note:
      expanded from macro 'V8_DEPRECATED'
  declarator __attribute__((deprecated(message)))
                            ^
In file included from ../src/binding.cpp:1:
In file included from ../../nan/nan.h:223:
In file included from ../../nan/nan_new.h:189:
../../nan/nan_implementation_12_inl.h:356:37: error: too few arguments to
      function call, expected 2, have 1
  return v8::StringObject::New(value).As<v8::StringObject>();
         ~~~~~~~~~~~~~~~~~~~~~      ^
/Users/eroncancio/.node-gyp/12.1.0/include/node/v8.h:5380:3: note: 'New'
      declared here
  static Local<Value> New(Isolate* isolate, Local<String> value);
  ^
In file included from ../src/binding.cpp:1:
In file included from ../../nan/nan.h:223:
In file included from ../../nan/nan_new.h:189:
../../nan/nan_implementation_12_inl.h:356:58: error: expected '(' for
      function-style cast or type construction
  return v8::StringObject::New(value).As<v8::StringObject>();
                                         ~~~~~~~~~~~~~~~~^
../../nan/nan_implementation_12_inl.h:356:60: error: expected expression
  return v8::StringObject::New(value).As<v8::StringObject>();
                                                           ^
In file included from ../src/binding.cpp:1:
In file included from ../../nan/nan.h:2722:
../../nan/nan_object_wrap.h:24:25: error: no member named 'IsNearDeath' in
      'Nan::Persistent<v8::Object, v8::NonCopyablePersistentTraits<v8::Object>
      >'
    assert(persistent().IsNearDeath());
           ~~~~~~~~~~~~ ^
/usr/include/assert.h:93:25: note: expanded from macro 'assert'
    (__builtin_expect(!(e), 0) ? __assert_rtn(__func__, __FILE__, __LINE...
                        ^
In file included from ../src/binding.cpp:1:
In file included from ../../nan/nan.h:2722:
../../nan/nan_object_wrap.h:127:26: error: no member named 'IsNearDeath' in
      'Nan::Persistent<v8::Object, v8::NonCopyablePersistentTraits<v8::Object>
      >'
    assert(wrap->handle_.IsNearDeath());
           ~~~~~~~~~~~~~ ^
/usr/include/assert.h:93:25: note: expanded from macro 'assert'
    (__builtin_expect(!(e), 0) ? __assert_rtn(__func__, __FILE__, __LINE...
                        ^
2 warnings and 5 errors generated.
make: *** [Release/obj.target/binding/src/binding.o] Error 1
gyp ERR! build error
gyp ERR! stack Error: `make` failed with exit code: 2
gyp ERR! stack     at ChildProcess.onExit (/Users/eroncancio/dev/bootstrap-4.3.1/node_modules/node-gyp/lib/build.js:262:23)
gyp ERR! stack     at ChildProcess.emit (events.js:196:13)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:256:12)
gyp ERR! System Darwin 18.5.0
gyp ERR! command "/usr/local/Homebrew/Cellar/node/12.1.0/bin/node" "/Users/eroncancio/dev/bootstrap-4.3.1/node_modules/node-gyp/bin/node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
gyp ERR! cwd /Users/eroncancio/dev/bootstrap-4.3.1/node_modules/node-sass
gyp ERR! node -v v12.1.0
gyp ERR! node-gyp -v v3.8.0
gyp ERR! not ok
Build failed with error code: 1
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.7 (node_modules/fsevents):
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.7 install: `node install`
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: Exit status 1

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! node-sass@4.11.0 postinstall: `node scripts/build.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the node-sass@4.11.0 postinstall script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/eroncancio/.npm/_logs/2019-05-18T02_30_21_784Z-debug.log

[XhmikosR]

This isn't directly our issue and it's already fixed on master and v4-dev branches.