More verbose error logging

[ThinhVu]

I. Actual
An error reported by this lib.

After adding console.error(err) in index.js file:

The issue here is that a comma is used instead of the semicolon, it leads to an incorrect token parser.

Expect: The error message should include the invalid CSS, for example in this case:

selector: '$desktop4K: 2560px,\n\n\n\n\n\n\n.my-orders[data-v-1589ac34]'

---

Do you know where the file css/app.7c579701.css is stored?