Npm run watch doesn't work with laravel : sh: cross-env: command not found - laravel

Question

I want to execute "npm run watch" in my laravel project but it doesn't work.
There is the error message
# watch /Applications/MAMP/htdocs/test-tech/laravel5
npm run development -- --watch
# development /Applications/MAMP/htdocs/test-tech/laravel5
cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js "--watch"
sh: cross-env: command not found
npm ERR! file sh
npm ERR! code ELIFECYCLE
npm ERR! errno ENOENT
npm ERR! syscall spawn
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 "--watch"
npm ERR! spawn ENOENT
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 WARN Local package.json exists, but node_modules missing, did you mean to install?
npm ERR! A complete log of this run can be found in:
npm ERR! /Users/xxx/.npm/_logs/2019-03-29T11_19_55_390Z-debug.log
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! # watch: npm run development -- --watch
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the # watch script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm WARN Local package.json exists, but node_modules missing, did you mean to install?
npm ERR! A complete log of this run can be found in:
npm ERR! /Users/xxx/.npm/_logs/2019-03-29T11_19_55_422Z-debug.log
And the debug file
0 info it worked if it ends with ok
1 verbose cli [ '/usr/local/bin/node', '/usr/local/bin/npm', 'run', 'watch' ]
2 info using npm#5.6.0
3 info using node#v8.11.3
4 verbose run-script [ 'prewatch', 'watch', 'postwatch' ]
5 info lifecycle #~prewatch: #
6 info lifecycle #~watch: #
7 verbose lifecycle #~watch: unsafe-perm in lifecycle true
8 verbose lifecycle #~watch: PATH: /usr/local/lib/node_modules/npm/node_modules/npm-lifecycle/node-gyp-bin:/Applications/MAMP/htdocs/test-tech/laravel5/node_modules/.bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
9 verbose lifecycle #~watch: CWD: /Applications/MAMP/htdocs/test-tech/laravel5
10 silly lifecycle #~watch: Args: [ '-c', 'npm run development -- --watch' ]
11 silly lifecycle #~watch: Returned: code: 1 signal: null
12 info lifecycle #~watch: Failed to exec watch script
13 verbose stack Error: # watch: `npm run development -- --watch`
13 verbose stack Exit status 1
13 verbose stack at EventEmitter.<anonymous> (/usr/local/lib/node_modules/npm/node_modules/npm-lifecycle/index.js:285:16)
13 verbose stack at emitTwo (events.js:126:13)
13 verbose stack at EventEmitter.emit (events.js:214:7)
13 verbose stack at ChildProcess.<anonymous> (/usr/local/lib/node_modules/npm/node_modules/npm-lifecycle/lib/spawn.js:55:14)
13 verbose stack at emitTwo (events.js:126:13)
13 verbose stack at ChildProcess.emit (events.js:214:7)
13 verbose stack at maybeClose (internal/child_process.js:925:16)
13 verbose stack at Process.ChildProcess._handle.onexit (internal/child_process.js:209:5)
14 verbose pkgid #
15 verbose cwd /Applications/MAMP/htdocs/test-tech/laravel5
16 verbose Darwin 18.2.0
17 verbose argv "/usr/local/bin/node" "/usr/local/bin/npm" "run" "watch"
18 verbose node v8.11.3
19 verbose npm v5.6.0
20 error code ELIFECYCLE
21 error errno 1
22 error # watch: `npm run development -- --watch`
22 error Exit status 1
23 error Failed at the # watch script.
23 error This is probably not a problem with npm. There is likely additional logging output above.
24 verbose exit [ 1, true ]
I googled it and tried some solutions but it still doesn't work.
How to resolve it ?
Thanks

Answer 1

The problem is that you are missing cross-env, you can run
npm install -g cross-env to install it globally, or npm install cross-env to install it locally in the current project.