I had this issue i did the following steps and i have no issues anymore:

  1. Delete node_modules directory
  2. Detete package-lock.json file -> very important
  3. Run npm install
  4. Run nom run dev

My details:

npm -v => 5.0.3
node -v => v8.1.4

"laravel-mix": "^1.2.1",
"cross-env": "^5.0.1",
"vue": "^2.4.1",

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