Node version (or tell us if you're using electron or some other framework):

electron 1.8.6 prebuilt from electron-builder

ShellJS version (the most recent version/Github branch you see the bug on):

shelljs 0.8.2

Operating system:

ubuntu 18.04

Description of the bug:

I am building an electron app using shelljs, and after packaging with electron-builder, using shelljs.exec fails, returning null and printing the following stacktrace on the console:

Error: Cannot find module '/redacted/dist/linux-unpacked/resources/app.asar/node_modules/shelljs/src/exec-child.js'
    at Function.Module._resolveFilename (module.js:547:15)
    at Function.Module._load (module.js:474:25)
    at Function.Module.runMain (module.js:693:10)
    at startup (bootstrap_node.js:191:16)
    at bootstrap_node.js:612:3

Example ShellJS command to reproduce the error:

exec(`find /bin /usr/bin /usr/local/bin -executable -name 'thunderbird' \\( -type f -or -type l \\)`)