Block-scoped declarations (let, const, function, class) not yet supported outside strict mode

[joeyrogues]

Stack

ember-cli: 2.12.1
node: 4.7.2
os: linux x64

Steps to reproduce

$> ember new myapp
$> cd myapp
$> ember install ember-attacher@^0.13.0
Block-scoped declarations (let, const, function, class) not yet supported outside strict mode
SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:373:25)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at Function.addonProto._requireBuildPackages.transpileModules.pickFiles.initializeAddons.eachAddonInvoke._eachProjectAddonInvoke.args._fileSystemInfo.addonProto.(anonymous function).Addon.lookup (/tmp/todo/myapp/node_modules/ember-cli/lib/models/addon.js:1593:19)
    at /tmp/todo/myapp/node_modules/ember-cli/lib/models/addons-factory.js:54:38
    at visit (/tmp/todo/myapp/node_modules/ember-cli/lib/utilities/DAG.js:23:3)

From what I've found
This is most likely due to node@4.7.2 and Block-scoped declarations
BUT
2 days ago we had ember-attacher working alright.

Hypothesis

1. Some (sub)dependencies of ember-attacher have permissive (^ or ~) and my problem is caused because some nested / nested / nested / nested dependencies have changed and now have non-compliant Block-scoped declarations

Potential solutions

1. Update nodejs
2. Look for the incriminated dependency(ies)
3. Something else???

What do you think? :)

[kybishop]

I'm honestly surprised node 4 was working at all 😉 You might notice that Travis is set to use node 6; I find Node 4's lack of even the basic creature-comforts quite painful to work with.

I'm hard pressed to tack down our dependencies given that ember drops support for Node 4 in April https://github.com/ember-cli/ember-cli/blob/026cefd5de36c0ae448883067450f51f2e127bbf/docs/node-support.md

How painful would it be for you guys to update Node? We can possibly create a temporary branch for people to use until they can update.

[joeyrogues]

Too bad.
Thanks for your answer.
It's time for some upgrades I guess :)
You can close the issue :)