Deprecation warning in my laravel./vuejs app with unused momentjs - vuejs2

Question

In my laravel 5. Vuejs 2, Vuex 3 app I got warning in my console:
Arguments:
[0] _isAMomentObject: true, _isUTC: false, _useUTC: false, _l: undefined, _i: function Vue (options) {
if (!(this instanceof Vue)) {
warn('Vue is a constructor and should be called with the `new` keyword');
}
this._init(options);
}, _f: undefined, _strict: undefined, _locale: [object Object]
Error
at Function.createFromInputFallback (http://local-hostels2.com/js/app.js?dt=1559733588:58205:98)
at configFromInput (http://local-hostels2.com/js/app.js?dt=1559733588:60508:19)
at prepareConfig (http://local-hostels2.com/js/app.js?dt=1559733588:60479:13)
at createFromConfig (http://local-hostels2.com/js/app.js?dt=1559733588:60446:44)
at createLocalOrUTC (http://local-hostels2.com/js/app.js?dt=1559733588:60533:16)
at createLocal (http://local-hostels2.com/js/app.js?dt=1559733588:60537:16)
at hooks (http://local-hostels2.com/js/app.js?dt=1559733588:57897:29)
at Function.Vue.use (http://local-hostels2.com/js/app.js?dt=1559733588:108861:14)
at Module../resources/js/app.js (http://local-hostels2.com/js/app.js?dt=1559733588:117240:44)
at __webpack_require__ (http://local-hostels2.com/js/app.js?dt=1559733588:20:30)
composer.json :
{
"name": "laravel/laravel",
"type": "project",
"description": "The Laravel Framework.",
"keywords": [
"framework",
"laravel"
],
"license": "MIT",
"require": {
"php": "^7.1.3",
"fideloper/proxy": "^4.0",
"fzaninotto/faker": "^1.8",
"intervention/image": "^2.4",
"laracasts/utilities": "^3.0",
"laravel/framework": "5.7.*",
"laravel/tinker": "^1.0",
"orangehill/iseed": "^2.6",
"pusher/pusher-php-server": "^3.4",
"tymon/jwt-auth": "^1.0.0",
"wboyz/laravel-enum": "^0.2.1",
"zizaco/entrust": "^1.9"
},
"require-dev": {
"beyondcode/laravel-dump-server": "^1.0",
"beyondcode/laravel-query-detector": "^1.0",
"filp/whoops": "^2.0",
"mockery/mockery": "^1.0",
"nunomaduro/collision": "^2.0",
"phpunit/phpunit": "^7.0",
"xethron/migrations-generator": "^2.0"
},
"config": {
"optimize-autoloader": true,
"preferred-install": "dist",
"sort-packages": true
},
"extra": {
"laravel": {
"dont-discover": []
}
},
"autoload": {
"psr-4": {
"App\\": "app/"
},
"classmap": [
"database/seeds",
"database/factories"
]
},
"autoload-dev": {
"psr-4": {
"Tests\\": "tests/"
}
},
"minimum-stability": "dev",
"prefer-stable": true,
"scripts": {
"post-autoload-dump": [
"Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
"#php artisan package:discover --ansi"
],
"post-root-package-install": [
"#php -r \"file_exists('.env') || copy('.env.example', '.env');\""
],
"post-create-project-cmd": [
"#php artisan key:generate --ansi"
]
}
}
My package.json :
{
"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": "^0.19.0",
"bootstrap": "^4.3.1",
"cross-env": "^5.1",
"jquery": "^3.4.0",
"laravel-mix": "^4.0.15",
"lodash": "^4.17.5",
"popper.js": "^1.15.0",
"resolve-url-loader": "^2.3.2",
"sass": "^1.19.0",
"sass-loader": "^7.1.0",
"vue": "^2.6.10",
"vue-template-compiler": "^2.6.10"
},
"dependencies": {
"font-awesome": "^4.7.0",
"laravel-echo": "^1.5.3",
"marked": "^0.6.2",
"moment": "^2.24.0",
"pusher-js": "^4.4.0",
"vee-validate": "^2.2.5",
"vee-validate-laravel": "^1.1.0",
"vue-carousel": "^0.18.0",
"vue-color": "^2.7.0",
"vue-focus": "^2.1.0",
"vue-form-wizard": "^0.8.4",
"vue-js-modal": "^1.3.28",
"vue-jstree": "^2.1.6",
"vue-moment": "^4.0.0",
"vue-nav-tabs": "^0.5.7",
"vue-notification": "^1.3.16",
"vue-router": "^3.0.6",
"vue-select": "^2.6.4",
"vue-wysiwyg": "^1.7.2",
"vue2-filters": "^0.6.0",
"vuejs-paginate": "^2.1.0",
"vuex": "^3.1.0"
}
}
Actually momentjs is not installed/used in my app, that can be checked in config files above.
It seems not critical now, but I would like to fix it anyway...
Can you please give a hint what could raise this warning and how to fix it?
Thanks!

Answer 1

Well, are you sure you don't use the vue-moment plugin in your code? We can read "vue-moment": "^4.0.0", in your packages.json file. I don't have access to your code but I imagine you're using it somewhere in your code. In your error, we can read arguments that contains _isAMomentObject: true... It should be somewhere a moment object.