uglify-js@^2.8.29:
  version "2.8.29"
  resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-2.8.29.tgz#29c5733148057bb4e1f75df35b7a9cb72e6a59dd"
  dependencies:
    source-map "~0.5.1"
    yargs "~3.10.0"
  optionalDependencies:
    uglify-to-browserify "~1.0.0"

uglify-to-browserify@~1.0.0:
  version "1.0.2"
  resolved "https://registry.yarnpkg.com/uglify-to-browserify/-/uglify-to-browserify-1.0.2.tgz#6e0924d6bda6b5afe349e39a6d632850a0f882b7"

uglifyjs-webpack-plugin@^0.4.6:
  version "0.4.6"
  resolved "https://registry.yarnpkg.com/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-0.4.6.tgz#b951f4abb6bd617e66f63eb891498e391763e309"
  dependencies:
    source-map "^0.5.6"
    uglify-js "^2.8.29"
    webpack-sources "^1.0.1"