extract call expression value

example.js

var fs = require('fs')

var babel = require('babel-core')
var estraverse = require('estraverse-fb')
var match = require('escallmatch')('I18n.t(message, [params])')

var code = fs.readFileSync(process.argv[2], 'utf8')

estraverse.traverse(babel.parse(code), {
  enter: function (node) {
    if (match.test(node)) {
      var first = node.arguments[0]
      if (first.value) {
        console.log(first.value)
      } else {
        if (first.type === 'ConditionalExpression') {
          console.log(first.consequent.value)
          console.log(first.alternate.value)
          return
        }

        console.error(node.arguments)
      }
    }
  }
})