Ember.js 2.7 does not build using yarn - does build using npm

Versions:

• ember.js 2.7, ember-data 2.7
• ember-cli 2.9.1 // true for ember-cli 2.7 as well
• node 6.9.1, npm 3.10.9 // true for node 4.4.4 and npm 2.15.5 as well
• Mac El Capitan

Steps to reproduce:

• rm -Rf node_modules bower_components
• yarn
• bower install
• ember s or ember build

Symptoms:

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Build failed. The Broccoli Plugin:

[Funnel: Funnel vendor/ember-cli-qunit/images /assets include:2] failed with:

Error: ENOENT: no such file or directory, scandir '/Users/somePath/client/tmp/funnel-input_base_path-http://ift.tt/2eJAvQB' at Error (native) at Object.fs.readdirSync (fs.js:951:18) at FSMonitor._measure (/Users/somePath/client/node_modules/heimdalljs-fs-monitor/index.js:66:21) at Object.readdirSync (/Users/somePath/client/node_modules/heimdalljs-fs-monitor/index.js:82:30) at _walkSync (/Users/somePath/client/node_modules/broccoli-funnel/node_modules/walk-sync/index.js:64:18) at Function.entries (/Users/somePath/client/node_modules/broccoli-funnel/node_modules/walk-sync/index.js:40:10) at Funnel.processFilters (/Users/somePath/client/node_modules/broccoli-funnel/index.js:264:26) at Funnel.build (/Users/somePath/client/node_modules/broccoli-funnel/index.js:202:10) at /Users/somePath/client/node_modules/broccoli-plugin/read_compat.js:61:34 at tryCatch (/Users/somePath/client/node_modules/rsvp/dist/rsvp.js:538:12)

The broccoli plugin was instantiated at: at Funnel.Plugin (/Users/somePath/client/node_modules/broccoli-plugin/index.js:7:31) at new Funnel (/Users/somePath/client/node_modules/broccoli-funnel/index.js:56:10) at /Users/somePath/client/node_modules/ember-cli/lib/broccoli/ember-app.js:1474:12 at Array.map (native) at EmberApp.otherAssets (/Users/somePath/client/node_modules/ember-cli/lib/broccoli/ember-app.js:1468:61) at EmberApp.toArray (/Users/somePath/client/node_modules/ember-cli/lib/broccoli/ember-app.js:1642:10) at EmberApp.toTree (/Users/somePath/client/node_modules/ember-cli/lib/broccoli/ember-app.js:1662:30) at module.exports (/Users/somePath/client/ember-cli-build.js:67:16) at CoreObject.setupBroccoliBuilder (/Users/somePath/client/node_modules/ember-cli/lib/models/builder.js:70:19) at CoreObject.init (/Users/somePath/client/node_modules/ember-cli/lib/models/builder.js:50:10)

---

If I do an npm install after yarn, the console output is:

---

npm WARN prefer global jshint@2.9.4 should be installed with -g npm WARN prefer global marked@0.3.6 should be installed with -g npm WARN prefer global node-gyp@3.3.1 should be installed with -g

node-sass@3.10.1 install /Users/somePath/client/node_modules/node-sass node scripts/install.js

node-sass@3.10.1 postinstall /Users/somePath/client/node_modules/node-sass node scripts/build.js

"/Users/somePath/client/node_modules/node-sass/vendor/darwin-x64-46/binding.node" exists. testing binary. Binary is fine; exiting. npm WARN prefer global npm@3.10.9 should be installed with -g

spawn-sync@1.0.15 postinstall /Users/somePathclient/node_modules/spawn-sync node postinstall

auth0-ember-simple-auth@1.1.0 node_modules/auth0-ember-simple-auth

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If I rm -Rf node_modules and do a standard npm install, the build works without errors like all the time before.

Any ideas?