Don't suppress build error backtraces

[jtrost]

Which operating system and version is the project developed on?
OS X 10.12.3

Which version of ruby is the project developed on?
2.4.0

Which version of npm is the project developed on?
4.1.2

Which version of ember-cli is the project developed on?
2.11.0

What is the rails version?
5.0.1

What is the ember-cli-rails version (from Gemfile)?
0.8.4

What is the ember-cli-rails-addon version (from package.json)?
0.8.0

I received this error in my application.

ActionView::Template::Error (:frontend has failed to build: 
):

It contained no backtrace, so I did not know what was wrong. I opened /lib/ember_cli/build_monitor.rb and inspected build_errors, and got this:

["\e[31m\n", "\e[31mMissing npm packages: \e[31m\n", "\e[0mPackage: \e[0m\e[36member-changeset\e[31m\n", "\e[90m  * Specified: \e[31m\e[0m1.2.1\e[0m\n", "\e[90m  * Installed: \e[31m\e[0m(not installed)\e[0m\n", "\e[0mPackage: \e[0m\e[36member-changeset-validations\e[31m\n", "\e[90m  * Specified: \e[31m\e[0m1.2.4\e[0m\n", "\e[90m  * Installed: \e[31m\e[0m(not installed)\e[0m\n", "\e[31mRun `npm install` to install missing dependencies.\e[31m\n", "\e[39m\n"]

This line suppresses all but the first build error, which in my case is:

"\e[31m\n"

That is why I did not see a backtrace with my build error. But I now know that I need to run npm install. This gem should show the entire backtrace, and not just the first line.

[shcherbanikolay]

Maybe it will be help for somebody. When i got
ActionView::Template::Error (:frontend has failed to build: )
This seemed that it was all good with your rails project, but there were issues with ember part of it.
So i changed directory to my frontend project directory. Then runed ember server. And ember told me that i have missing npm packages. I run npm install, and it solved my issue. Excuse me for my bad English.