从 Promise 结果中导出 Node 模块

I'm trying to rewrite a module to return a different value than before, but now it uses an async call to get that value. (with child_process if it matters). I've wrapped it in a Promise, but that's not critical to me - it can be in the original child_process callback, but the problem is I can't chain the promise to everywhere in the app because I need this to become synchronous. Here's my module:

exec = require('child_process').exec

platformHome = process.env[if process.platform is 'win32' then 'USERPROFILE' else 'HOME']

getExecPath = new Promise (resolve, reject) ->
  path = process.env.GEM_HOME

  if path
    resolve(path)
  else
    exec 'gem environment', (err, stdout, stderr) ->
      unless err
        line = stdout.split(/?
/)
                 .find((l) -> ~l.indexOf('EXECUTABLE DIRECTORY'))
        if line
          resolve line[line.indexOf(': ') + 2..]
        else
          reject undefined

GEM_HOME = undefined

getExecPath.then (path) ->
  GEM_HOME = path
.catch ->
  GEM_HOME = "#{platformHome}/.gem/ruby/2.3.0"
.then =>
  module.exports = GEM_HOME // or simply return it

显然，当需要模块时，这不起作用 - 如果我返回承诺本身，并在 require 之后使用 then - 我的下一个 module.exports 将是异步的，并且该链将继续进行.我该如何避免这种模式?

require('module-name').then(value => {
  // you have your value here
});

var value = require('module-name');
// you cannot have your value here because this line
// will get evaluated before that value is available

module.exports = { GEM_HOME: null };

module.exports = GEM_HOME

module.exports.GEM_HOME = GEM_HOME

var x = require('module-name');