Cannot read property common of undefined

Everytime I run npm run watch and it detects changes I receive the error

unknown property commons of undefined

which is refering to

window.axios = require('axios');
window.axios.defaults.headers.common['X-Requested-With'] = 'XMLHttpRequest';

My dependencies

  "axios": "^0.16.2",
  "cross-env": "^5.0.1",
  "jquery": "^3.1.1",
  "laravel-mix": "^1.0",
  "vue": "^2.1.10",
  "less": "^2.7.2",
  "less-loader": "^4.0.5"

I’m working with a fresh laravel installation on a windows machine.

Steps To Reproduce:

• run npm run watch
• make a change to a vue or less file
• reload page

It’s working perfectly fine with npm run dev

It also seems like the watcher tries to run multiple times. I receive a lot of notifications about the buld success.

Update

Working when chaning laravel-mix version to 0.*

Already described in #1120

[ruchernchong]

Based on #1120’s error

Change this:

window.axios.defaults.headers.common['X-Requested-With'] = 'XMLHttpRequest';

to

window.axios.defaults.headers.common = {
    'X-Requested-With': 'XMLHttpRequest'
}

[goatatwork]

Experiencing seemingly the same symptoms here. This was happening with Laravel 5.4 and is now happening in 5.5. This is on a Mac using Valet. This is with fresh installs of either.

What I have observed:

• I run npm run watch the entire time.
• Changes to .vue files: No problems. Everything is recompiled and works as expected.
• Changes to .scss files: The compile does not error, but the next page load results in…

Uncaught TypeError: Cannot read property 'common' of undefined

I have not tried to kill and restart the npm process like others have. Instead, what I have found to ‘fix’ the issue is to (re)save a .vue file a couple of times. I can save the same .vue file 2-4 times or save 2-4 separate .vue files and then the page loads without error. So it doesn’t appear to care what is saved as long as it’s a .vue file, and it needs a few saves to fly straight again.

That said, those details sound like untroubleshot technical voodoo. But, I’ve seen this specific issue and workaround stay consistent for the last several months.

I am ignorant as to what information about my system might be helpful, but I’m more than happy to produce any details that would help.