sync-functions crash in node 12 when used in tape-test

[SockeThe2nd]

I am using node-etcd to load some settings inside a tape-test but the test crashes with a v8 error.

I am using:

• Node v12.13.1
• tape@4.11.0
• node-etcd@7.0.0

The code runs with node 10, but fails with node 12.

Code:

const test = require('tape');

test('test node-etcd sync', function (t) {
    t.plan(1);
    var Etcd = require('node-etcd');

    var etcdClient = new Etcd();

    etcdClient.mkdirSync('test/');

    etcdClient.setSync(`test/key`, 'value');
    t.ok(true)
});

Output:

TAP version 13
# test node-etcd sync
FATAL ERROR: v8::ToLocalChecked Empty MaybeLocal.
 1: 0x9da7c0 node::Abort() [node]
 2: 0x9db976 node::OnFatalError(char const*, char const*) [node]
 3: 0xb39cea v8::Utils::ReportApiFailure(char const*, char const*) [node]
 4: 0x97ca05 node::Environment::CheckImmediate(uv_check_s*) [node]
 5: 0x12de47c  [node]
 6: 0x12d7073 uv_run [node]
 7: 0x7f4c4f5e2694 Run(Napi::CallbackInfo const&) [/mnt/d/dev/playground/etcd_test/node_modules/deasync/bin/linux-x64-node-12/deasync.node]
 8: 0x7f4c4f5e37cb Napi::details::CallbackData<Napi::Value (*)(Napi::CallbackInfo const&), Napi::Value>::Wrapper(napi_env__*, napi_callback_info__*) [/mnt/d/dev/playground/etcd_test/node_modules/deasync/bin/linux-x64-node-12/deasync.node]   9: 0x98f4d5  [node]
10: 0xba5d59  [node]
11: 0xba7b47 v8::internal::Builtin_HandleApiCall(int, unsigned long*, v8::internal::Isolate*) [node]
12: 0x13750d9  [node]
Aborted (core dumped)

I first thought the problem was the deasync module itself so I testet the examples provided in the deasync-repo but they all worked inside a tape-test.