why I can not run npm run dev successfully? - laravel

Question

cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js
/Users/xwu33/src/bioproc/node_modules/webpack-cli/bin/cli.js:93
throw err;
^
TypeError: Cannot read property 'js' of undefined
at Object. (/Users/xwu33/src/bioproc/webpack.mix.js:16:3)
at Module._compile (/Users/xwu33/src/bioproc/node_modules/v8-compile-cache/v8-compile-cache.js:192:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
at Module.load (internal/modules/cjs/loader.js:599:32)
at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
at Function.Module._load (internal/modules/cjs/loader.js:530:3)
at Module.require (internal/modules/cjs/loader.js:637:17)
at require (/Users/xwu33/src/bioproc/node_modules/v8-compile-cache/v8-compile-cache.js:161:20)
at Object. (/Users/xwu33/src/bioproc/node_modules/laravel-mix/setup/webpack.config.js:12:1)
at Module._compile (/Users/xwu33/src/bioproc/node_modules/v8-compile-cache/v8-compile-cache.js:192:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
at Module.load (internal/modules/cjs/loader.js:599:32)
at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
at Function.Module._load (internal/modules/cjs/loader.js:530:3)
at Module.require (internal/modules/cjs/loader.js:637:17)
at require (/Users/xwu33/src/bioproc/node_modules/v8-compile-cache/v8-compile-cache.js:161:20)
at WEBPACK_OPTIONS (/Users/xwu33/src/bioproc/node_modules/webpack-cli/bin/utils/convert-argv.js:116:13)
at requireConfig (/Users/xwu33/src/bioproc/node_modules/webpack-cli/bin/utils/convert-argv.js:118:6)
at /Users/xwu33/src/bioproc/node_modules/webpack-cli/bin/utils/convert-argv.js:125:17
at Array.forEach ()
at module.exports (/Users/xwu33/src/bioproc/node_modules/webpack-cli/bin/utils/convert-argv.js:123:15)
at yargs.parse (/Users/xwu33/src/bioproc/node_modules/webpack-cli/bin/cli.js:71:45)
at Object.parse (/Users/xwu33/src/bioproc/node_modules/webpack-cli/node_modules/yargs/yargs.js:567:18)
at /Users/xwu33/src/bioproc/node_modules/webpack-cli/bin/cli.js:49:8
at Object. (/Users/xwu33/src/bioproc/node_modules/webpack-cli/bin/cli.js:390:3)
at Module._compile (internal/modules/cjs/loader.js:689:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
at Module.load (internal/modules/cjs/loader.js:599:32)
at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
at Function.Module._load (internal/modules/cjs/loader.js:530:3)
at Module.require (internal/modules/cjs/loader.js:637:17)
at require (internal/modules/cjs/helpers.js:22:18)
at Object. (/Users/xwu33/src/bioproc/node_modules/webpack/bin/webpack.js:156:2)
at Module._compile (internal/modules/cjs/loader.js:689:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
at Module.load (internal/modules/cjs/loader.js:599:32)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! # development: cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the # development script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! /Users/xwu33/.npm/_logs/2019-06-21T17_03_18_125Z-debug.log
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! # dev: npm run development
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the # dev script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! /Users/xwu33/.npm/_logs/2019-06-21T17_03_18_244Z-debug.log

Answer 1

When I changed webpack.mix.js file like this:
// TypeError: Cannot read property 'js' of undefined
const { mix } = require('laravel-mix');
// work
const mix = require('laravel-mix');
Then it works for me!

Answer 2

Removed node_modules, then npm install --global cross-env, followed by removing cross-env from package.json, then npm run dev worked.