It took me half a day to realize the https://github.com/vuejs/vue-cli or https://github.com/raineorshine/npm-check-updates is very slow because update-notifier has no proxy support (and i am sitting behind a corporate firewall).
Looks like sindresorhus/package-json#54 is the problem for that. Would you mind adding https://github.com/gajus/global-agent for proxy support?
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