babel-i18n.js

const babel = require('babel-core');
const fs = require('fs');
const glob = require("glob")
const traverse = require("babel-traverse").default;

const i18n = {}

function get(properties) {
  if(Array.isArray(properties)) {
    let key, value
    properties.forEach(property => {
      if (property.key.name === 'id') {
        key = property.value.value
      } else if (property.key.name === 'defaultMessage') {
        value = property.value.value
      }
    })
    return { [key]: value }
  }
}

glob("./src/**/*.js?(x)", {}, function (er, files) {
  files.forEach((file) => {
    const { ast } = babel.transformFileSync(file)
    traverse(ast, {
      CallExpression(path) {
        if (path.node.callee.type == 'MemberExpression' && path.node.callee.object.name === 'intl' && path.node.callee.property.name === 'formatMessage') {
          Object.assign(i18n, get(path.node.arguments[0].properties)) 
        } else if (
          path.node.callee.type == 'MemberExpression' && 
          path.node.callee.property.name === 'createElement'
        ) {
          const firstArgs = path.node.arguments[0]
          if (firstArgs.type === 'MemberExpression' && firstArgs.object.name === '_reactIntl' && firstArgs.property.name === 'FormattedMessage') {
            Object.assign(i18n, get(path.node.arguments[1].properties)) 
          }
        }
      }
    })
  })
  console.log(i18n)
})