New umbrella config breaks watchers

[austinsmorris]

Environment

• Elixir version (elixir -v):
• Phoenix version (mix deps): 1.4.4
• NodeJS version (node -v):
• NPM version (npm -v):
• Operating system:

Issue

Now that there is only a top level config on a new umbrella project, the watchers that mix phx.new my_app --umbrella generates are incorrect.

In /config/dev.exs the endpoint config includes:

  watchers: [
    node: [
      "node_modules/webpack/bin/webpack.js",
      "--mode",
      "development",
      "--watch-stdin",
      cd: Path.expand("../assets", __DIR__)
    ]
  ]

Note the cd: Path.expand("../assets", __DIR__)

Since this config is now at the umbrella root instead of the web app root, it should be something like cd: Path.expand("../apps/my_app_web/assets", __DIR__).