How do I fix a "Vue packages version mismatch" error on Laravel Spark v4.0.9?

Question

When I run npm run dev on a Laravel Spark v4.0.9 app, I get the following error:

Module build failed: Error:

Vue packages version mismatch:

- [email protected]
- [email protected]

This may cause things to work incorrectly. Make sure to use the same version for both.
If you are using vue-loader@>=10.0, simply update vue-template-compiler.
If you are using vue-loader@<10.0 or vueify, re-installing vue-loader/vueify should bump vue-template-compiler to the latest.

My package.json looks like this:

{
  "private": true,
  "scripts": {
    "dev": "cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
    "watch": "cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --watch --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
    "hot": "cross-env NODE_ENV=development node_modules/webpack-dev-server/bin/webpack-dev-server.js --inline --hot --config=node_modules/laravel-mix/setup/webpack.config.js",
    "production": "cross-env NODE_ENV=production node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js"
  },
  "dependencies": {
    "axios": "^0.15.2",
    "bootstrap": "^3.0.0",
    "cross-env": "^3.2.3",
    "jquery": "^2.1.4",
    "js-cookie": "^2.1.0",
    "laravel-mix": "0.*",
    "moment": "^2.10.6",
    "promise": "^7.1.1",
    "sweetalert": "^1.1.3",
    "underscore": "^1.8.3",
    "urijs": "^1.17.0",
    "vue": "~2.0.1",
    "vue-resource": "^1.2.0",
    "vue-router": "^2.2.1",
    "vue-truncate-filter": "^1.1.6",
    "vuejs-datepicker": "^0.6.2"
  },
  "devDependencies": {
    "browser-sync": "^2.18.8",
    "browser-sync-webpack-plugin": "^1.1.4"
  }
}

I have tried the following (at different times, not in order):

• deleted node_modules and npm install
• tried just running yarn and yarn upgrade
• removing vue-loader and reinstalling
• specifying exact versions of vue and vue-template-compiler rather than leaving it up to npm to install or yarn to figure out dependencies
• removing other non-essential packages (vue-router, vue-truncate-filter, vuejs-datepicker) and trying all of the above again
• banging my head against a wall

Answer 1

This worked for me:

1. Modify package.json:

   “vue”: “^2.0.8",
   “vue-template-compiler”: “^2.1.8"
   

2. Delete node_modules

3. Run npm install