Truffle Migration Failure

[mnaamani]

When running truffle migration I see the following error after the last migration step:

(node:63563) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): SyntaxError: Unexpected end of JSON input
(node:63563) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
node[63563]: ../src/timer_wrap.cc:107:static void node::(anonymous namespace)::TimerWrap::Stop(const FunctionCallbackInfo<v8::Value> &): Assertion `HandleWrap::IsAlive(wrap)' failed.
 1: node::Abort() [/usr/local/bin/node]
 2: node::(anonymous namespace)::DomainEnter(node::Environment*, v8::Local<v8::Object>) [/usr/local/bin/node]
 3: node::(anonymous namespace)::TimerWrap::~TimerWrap() [/usr/local/bin/node]
 4: v8::internal::FunctionCallbackArguments::Call(void (*)(v8::FunctionCallbackInfo<v8::Value> const&)) [/usr/local/bin/node]
 5: v8::internal::MaybeHandle<v8::internal::Object> v8::internal::(anonymous namespace)::HandleApiCallHelper<false>(v8::internal::Isolate*, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::FunctionTemplateInfo>, v8::internal::Handle<v8::internal::Object>, v8::internal::BuiltinArguments) [/usr/local/bin/node]
 6: v8::internal::Builtin_Impl_HandleApiCall(v8::internal::BuiltinArguments, v8::internal::Isolate*) [/usr/local/bin/node]
 7: 0x1f532b98463d

I believe this is a result of truffle not running the migrations sequentially, or issues with how async/await pattern is used in the migrations scripts.

Error seen when running following versions of node and truffle:

Node v8.9.4
Truffle v4.1.13

A good pattern that has worked well for me to use in the migrations scripts:

module.exports = function (deployer, network, accounts) {
  return deployer.then(async () => {

  })
}

[sohkai]

Closed by #366.