$ mixpanel
/Users/eugeneware/.nvm/versions/node/v4.6.0/lib/node_modules/mixpanel-cli/mixpanel-cli.js:69
protocol.forEach(({method: {name, arguments:args}, description}) => {
^
SyntaxError: Unexpected token {
at exports.runInThisContext (vm.js:53:16)
at Module._compile (module.js:373:25)
at Object.Module._extensions..js (module.js:416:10)
at Module.load (module.js:343:32)
at Function.Module._load (module.js:300:12)
at Module.require (module.js:353:17)
at require (internal/module.js:12:17)
at Object.<anonymous> (/Users/eugeneware/.nvm/versions/node/v4.6.0/lib/node_modules/mixpanel-cli/mixpanel:3:1)
at Module._compile (module.js:409:26)
at Object.Module._extensions..js (module.js:416:10)
Seems to require a more recent version of node:
Works OK on v6 or v7 though.
Might be worth adding that to the README.