Problem with `shelljs`?

I would like to try shelljs in meteor 1.8
(npm install --save shelljs)

// Method
import shell from 'shelljs';
............
......

But get error

Uncaught Error: Cannot find module './src/cat'
    at makeMissingError (modules-runtime.js?hash=d3c3e5d67c95f97a60888bda7373292efad3be5e:232)
    at Module.require (modules-runtime.js?hash=d3c3e5d67c95f97a60888bda7373292efad3be5e:251)
    at require (modules-runtime.js?hash=d3c3e5d67c95f97a60888bda7373292efad3be5e:268)
    at modules.js?hash=08cf9ad44310217e9f18ac9203a0a59b82a42b2a:41746
    at Array.forEach (<anonymous>)
    at shell.js (modules.js?hash=08cf9ad44310217e9f18ac9203a0a59b82a42b2a:41745)
    at fileEvaluate (modules-runtime.js?hash=d3c3e5d67c95f97a60888bda7373292efad3be5e:346)
    at Module.require (modules-runtime.js?hash=d3c3e5d67c95f97a60888bda7373292efad3be5e:248)
    at Module.moduleLink [as link] (modules.js?hash=08cf9ad44310217e9f18ac9203a0a59b82a42b2a:291)
    at methods.js (methods.js:1)

We’re using it in one of our packages, and we don’t have any error. Are you on Windows?

thanks for your reply.
It problem with Method call promise

// Client call
execShell.callPromise()....... // Error
------
Meteor.call('execShell'........) // Workfine