{
  "dependencies": {
    "autoprefixer": "^7.1.1",
    "babel-core": "^6.24.1",
    "babel-loader": "7.x",
    "babel-preset-env": "^1.5.0",
    "coffee-loader": "^0.7.3",
    "coffee-script": "^1.12.6",
    "compression-webpack-plugin": "^0.4.0",
    "css-loader": "^0.28.1",
    "extract-text-webpack-plugin": "^2.1.0",
    "file-loader": "^0.11.1",
    "glob": "^7.1.2",
    "js-yaml": "^3.8.4",
    "moment": "^2.18.1",
    "node-sass": "^4.5.3",
    "path-complete-extname": "^0.1.0",
    "postcss-loader": "^2.0.5",
    "postcss-smart-import": "^0.7.0",
    "precss": "^1.4.0",
    "rails-erb-loader": "^5.0.1",
    "sass-loader": "^6.0.5",
    "sir-trevor": "^0.6.5",
    "style-loader": "^0.18.0",
    "webpack": "^2.5.1",
    "webpack-manifest-plugin": "^1.1.0",
    "webpack-merge": "^4.1.0"
  },
  "devDependencies": {
    "webpack-dev-server": "^2.4.5"
  }
}

{
  "dependencies": {
    "autoprefixer": "^7.1.1",
    "babel-core": "^6.24.1",
    "babel-loader": "7.x",
    "babel-preset-env": "^1.5.0",
    "coffee-loader": "^0.7.3",
    "coffee-script": "^1.12.6",
    "compression-webpack-plugin": "^0.4.0",
    "css-loader": "^0.28.1",
    "extract-text-webpack-plugin": "^2.1.0",
    "file-loader": "^0.11.1",
    "glob": "^7.1.2",
    "js-yaml": "^3.8.4",
    "moment": "^2.18.1",
    "node-sass": "^4.5.3",
    "path-complete-extname": "^0.1.0",
    "postcss-loader": "^2.0.5",
    "postcss-smart-import": "^0.7.0",
    "precss": "^1.4.0",
    "rails-erb-loader": "^5.0.1",
    "sass-loader": "^6.0.5",
    "sir-trevor": "^0.6.5",
    "style-loader": "^0.18.0",
    "webpack": "^2.5.1",
    "webpack-manifest-plugin": "^1.1.0",
    "webpack-merge": "^4.1.0"
  },
  "devDependencies": {
    "webpack-dev-server": "^2.4.5"
  },
  "engines": {
    "node": ">= 6.4.0"
  }
}

Use Node >= 6.4 for Webpacker
Use Node >= 6.4 for Webpacker
