electron/tools/run-if-exists.js

const cp = require('child_process')
const fs = require('fs')

const checkPath = process.argv[2]
const command = process.argv.slice(3)

if (fs.existsSync(checkPath)) {
  const child = cp.spawn(
    `${command[0]}${process.platform === 'win32' ? '.cmd' :''}`,
    command.slice(1),
    {
      stdio: 'inherit',
      cwd: checkPath
    }
  )
  child.on('exit', code => process.exit(code))
}