I have the same problem and y fix it replacing my package.json with this
{
"private": true,
"scripts": {
"dev": "npm run development",
"development": "cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
"watch": "npm run development -- --watch",
"watch-poll": "npm run watch -- --watch-poll",
"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",
"prod": "npm run production",
"production": "cross-env NODE_ENV=production node_modules/webpack/bin/webpack.js --no-progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js"
},
"devDependencies": {
"axios": "^0.18",
"bootstrap": "^4.0.0",
"jquery": "^3.2",
"laravel-mix": "^2.0",
"lodash": "^4.17.5",
"popper.js": "^1.12",
"vue": "^2.5.7",
"autoprefixer": "^7.1.2",
"babel-core": "^6.26.3",
"babel-eslint": "^7.1.1",
"babel-loader": "^7.1.1",
"babel-plugin-component": "^1.1.0",
"babel-plugin-istanbul": "^4.1.1",
"babel-plugin-transform-runtime": "^6.22.0",
"babel-preset-env": "^1.6.0",
"babel-polyfill": "^6.26.0",
"babel-preset-stage-2": "^6.22.0",
"babel-register": "^6.22.0",
"chai": "^4.1.2",
"chalk": "^2.0.1",
"chromedriver": "^2.27.2",
"compression-webpack-plugin": "^1.0.1",
"connect-history-api-fallback": "^1.3.0",
"copy-webpack-plugin": "^4.1.0",
"cross-env": "^5.0.1",
"cross-spawn": "^5.0.1",
"css-loader": "^0.28.0",
"eslint": "^3.19.0",
"eslint-config-standard": "^10.2.1",
"eslint-friendly-formatter": "^3.0.0",
"eslint-loader": "^1.7.1",
"eslint-plugin-html": "^3.0.0",
"eslint-plugin-import": "^2.6.1",
"eslint-plugin-node": "^4.2.2",
"eslint-plugin-promise": "^3.5.0",
"eslint-plugin-standard": "^3.0.1",
"eventsource-polyfill": "^0.9.6",
"express": "^4.14.1",
"extract-text-webpack-plugin": "^2.0.0",
"file-loader": "^0.11.1",
"friendly-errors-webpack-plugin": "^1.1.3",
"function-bind": "^1.1.0",
"html-webpack-plugin": "^2.28.0",
"http-proxy-middleware": "^0.17.3",
"inject-loader": "^3.0.0",
"karma": "^1.4.1",
"karma-coverage": "^1.1.1",
"karma-mocha": "^1.3.0",
"karma-phantomjs-launcher": "^1.0.2",
"karma-phantomjs-shim": "^1.4.0",
"karma-sinon-chai": "^1.3.1",
"karma-sourcemap-loader": "^0.3.7",
"karma-spec-reporter": "0.0.31",
"karma-webpack": "^2.0.2",
"lolex": "^1.5.2",
"marked": "^0.3.6",
"mocha": "^3.2.0",
"nightwatch": "^0.9.12",
"node-sass": "^4.5.3",
"opn": "^5.1.0",
"optimize-css-assets-webpack-plugin": "^3.2.0",
"ora": "^1.2.0",
"phantomjs-prebuilt": "^2.1.14",
"raw-loader": "^0.5.1",
"sass-loader": "^5.0.1",
"selenium-server": "^3.0.1",
"semver": "^5.3.0",
"shelljs": "^0.7.6",
"sinon": "^2.1.0",
"sinon-chai": "^2.8.0",
"url-loader": "^0.5.8",
"vue-loader": "^13.0.4",
"vue-style-loader": "^3.0.1",
"vue-template-compiler": "^2.5.2",
"vue-test-utils": "^1.0.0-beta.3",
"webpack": "^3.2.0",
"webpack-bundle-analyzer": "^2.2.1",
"webpack-dev-middleware": "^1.10.0",
"webpack-hot-middleware": "^2.18.0",
"webpack-merge": "^4.1.0"
},
"dependencies": {
"chartist": "^0.11.0",
"easy-pie-chart": "^2.1.7",
"element-ui": "^2.0.3",
"fullcalendar": "^3.6.2",
"google-maps": "^3.2.1",
"jquery": "^3.2.1",
"jvectormap-next": "^3.0.0",
"perfect-scrollbar": "0.7.1",
"sweetalert2": "^6.11.4",
"vee-validate": "^2.0.0-rc.21",
"vue": "^2.5.2",
"vue-clickaway": "^2.1.0",
"vue-form-wizard": "^0.7.0",
"vue-nav-tabs": "^0.5.4",
"vue-notifyjs": "^0.2.0",
"vue-router": "^3.0.1"
},
"engines": {
"node": ">= 4.0.0",
"npm": ">= 3.0.0"
}
after, i make this things :
rm -rf node_modules
rm package-lock.json yarn.lock
npm cache clear --force
npm install
npm run dev
I hope this can help you.
