rsimha@bobdylan (master):~/src/amphtml$ yarn check
yarn check v1.3.2
info fsevents@1.1.2: The platform "linux" is incompatible with this module.
info "fsevents@1.1.2" is an optional dependency and failed compatibility check. Excluding it from installation.
warning "babel-preset-env#browserslist@^2.1.2" could be deduped from "2.10.0" to "browserslist@2.10.0"
warning "babel-preset-env#browserslist#caniuse-lite@^1.0.30000718" could be deduped from "1.0.30000783" to "caniuse-lite@1.0.30000783"
warning "babel-preset-env#browserslist#electron-to-chromium@^1.3.18" could be deduped from "1.3.28" to "electron-to-chromium@1.3.28"
warning "postcss#chalk#supports-color@^4.0.0" could be deduped from "4.5.0" to "postcss#supports-color@4.5.0"
warning "karma-mocha-reporter#log-symbols#chalk@^2.0.1" could be deduped from "2.3.0" to "karma-mocha-reporter#chalk@2.3.0"
error "react-moment-proptypes#moment" not installed
info Found 5 warnings.
error Found 1 errors.
info Visit https://yarnpkg.com/en/docs/cli/check for documentation about this command.