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"Property $notify does not exist on type" - Can't use npm package on Vue App

I am using this npm package to send notifications in my Vue App. After following the instructions, and adding the required usages on the main.ts, I keep getting when I try to use the features of it:
Property '$notify' does not exist on type 'Shop'
main.ts:
import Vue from 'vue'
import Notifications from 'vue-notification'
import App from './App.vue'
Vue.use(Notifications)
new Vue({
render: h => h(App)
}).$mount('#app')
<script lang="ts">
import { Component, Vue } from "vue-property-decorator";
import Character from "./Character.vue";
import Vendor from "./Vendor.vue";
#Component<Shop>({
components: {
Character,
Vendor
},
})
export default class Shop extends Vue {
sellItem(itemID) {
this.$notify({
title: 'Important message',
text: 'Hello user!'
});
}
}
</script>
I have tried importing the component in the .vue file, however it does not recognize the type. What am I doing wrong? I can't find any solution for this...
Thank you.

Add a shim typings file
You need a file that imports and re-exports the type of "Vue", it is named vue-file-import.d.ts, but elsewhere on the internet it is commonly called vue-shim.d.ts. Regardless of name, the content needed is the same:
// vue-file-import.d.ts
declare module "*.vue" {
import Vue from "vue";
export default Vue;
}
Try placing the above file in /src location. But sometimes when you move around changing things it might not work so I suggest you to place it inside /typings location

Add External script into vue.js

I would like to include into my vue.js application a simple javascript script with an external link to the library, this one:
<script type="text/javascript" src="https://my_site/index.js"></script>
<link rel="stylesheet" href="https://my_site/index.css" />
<script type="text/javascript">
document.addEventListener('DOMContentLoaded', function () {
new Pbx(
{
"key1": 'value1',
"key2": 'value2'
},
{
'config': 'configValue'
}
);
});
</script>
I have this main.js file and I would like to keep external my script:
import Vue from 'vue';
import VModal from 'vue-js-modal';
import App from './App.vue';
import router from './router';
import store from './store';
import i18n from './i18n';
import VueScrollactive from 'vue-scrollactive';
import VTooltip from 'v-tooltip';
import './styles/index.scss';
export default new Vue({
el: '#myApp',
store,
router,
i18n,
render: h => h(App),
});
I would like to know how to include my library in a good way, I have tried to include my javascrupt here but I don't like it so much.
Thanks

I remember I had used jQuery without installing it in npm, as long as you place <script> tag of jQuery on top of script tag of the build files that is placed inside the generated html file you may able to access the $ variable of jQuery inside your app.
You may do something like creating a separate .js file for that variable you want to access. let pbx = new Pbx(data) and the pbx data is accessible throughout the app as long the placing of script tags is proper.
One thing though, document.addEventListener('DOMContentLoaded') might interfere with vue, however you can access the pbx variable to the mounted life cycle of App component if you want to access it immediately

Vue/Vuetify - Unknown custom element: <v-app> - did you register the component correctly?

I am new to Vue and Vuetify. I just created quick app to check both of them. But I am a running into issues in beginning. The vue fails to identify vuetify components despite following all the steps outlined in document. The error is like below -
vue.runtime.esm.js?ff9b:587 [Vue warn]: Unknown custom element:
- did you register the component correctly? For recursive
components, make sure to provide the "name" option.
found in
---> at src\App.vue
You can access the entire code at sandbox https://codesandbox.io/s/40rqnl8kw

You're likely experiencing a problem with the order of your operations. You're defining your own App component that uses the v-app component before you've even told Vue to make use of it, so Vue assumes you're using your own custom v-app component.
Place Vue.use(Vuetify) before starting any Vue instances via new Vue() that require Vuetify components, or place it within the component definitions themselves right at the top of the <script> tag after importing Vue and Vuetify within the single file component. Don't worry if you have more than one Vue.use(Vuetify) statement because only the first one will do anything--all subsequent calls will simply do nothing.
Original - Vue.use() is called before new Vue(), resulting in an error.
new Vue({
el: "#app",
components: { App },
template: "<App/>"
});
Vue.use(Vuetify);
Fix - Calling new Vue() after Vue.use() allows Vue to resolve the dependency correctly.
Vue.use(Vuetify);
new Vue({
el: "#app",
components: { App },
template: "<App/>"
});

There is another reason for this error that I recently ran into.
I recently upgraded from Vuetify 1.5 to 2.x and even though I had the order of operations correct as in the currently accepted answer here I was still receiving the error about v-app being unknown:
Unknown custom element: <v-app> - did you register the component
correctly? For recursive components, make sure to provide the "name"
option.
Turns out that the upgrade process requires the following addition to package.json devDependencies section which didn't originally exist in my vuetify 1.5x package:
"vuetify-loader": "^1.3.0"
(1.3.0 current version as of this writing)
Once I added that the error went away.

If you are coming from Google: for me it was breaking changes from v1 to v2, that made most Codepen examples useless.
I had to change this to get a very simple Vuetify app with navigation drawers to run again:
remove toolbar from <v-app toolbar>
replace v-toolbar with v-app-bar
replace v-app-bar-side-icon with v-app-bar-nav-icon
replace v-app-bar-title with v-toolbar
replace v-list-tile to v-list-item
replace all flat with text
Maybe this helps someone.
(edited to include cong yu's remark)

Edit: it looks like VuetifyLoader will automatcially do that for you.
Old Answer: Another possible problem is if you have a la carte enabled you will need to also specify all the components that you want included:
import Vue from 'vue'
import App from './App.vue'
import Vuetify, {
VApp, // required
VNavigationDrawer,
VFooter,
VToolbar,
VFadeTransition
} from 'vuetify/lib'
import { Ripple } from 'vuetify/lib/directives'
Vue.use(Vuetify, {
components: {
VApp,
VNavigationDrawer,
VFooter,
VToolbar,
VFadeTransition
},
directives: {
Ripple
}
})

With vuetify v2.x you should register the vuetify plugin as follows :
import Vue from 'vue'
/** register vuetify plugin globally **/
import Vuetify from 'vuetify/lib'
Vue.use(Vuetify)
const opts = {}
const vuetify= new Vuetify(opts)
/****/
new Vue({
vuetify,
}).$mount('#app')
Vuetify v3
import { createApp } from 'vue'
import App from './App.vue'
/*****/
import '#mdi/font/css/materialdesignicons.css'
import 'vuetify/lib/styles/main.sass'
import { createVuetify } from 'vuetify'
import * as components from 'vuetify/components'
import * as directives from 'vuetify/directives'
const vuetify= createVuetify({
components,
directives,
})
/****/
const app = createApp(App)
app.use(vuetify)
app.mount('#app')

I experienced the same issue. It was caused by the cache of the browser make sure to clear the cache as well.

You will get this error even after installing the official Vuetify 3 (Alpha), due to the standard demo version generated during the install lacking adding components, i.e:
import * as components from "vuetify/components";
import * as directives from "vuetify/directives";
const vuetify = createVuetify({
components,
directives,
});
Thus the working version of main.ts for Vuetify 3 is:
import "vuetify/styles"; // Global CSS has to be imported
import { createApp } from "vue";
import { createVuetify } from "vuetify";
import App from "./App.vue";
import * as components from "vuetify/components";
import * as directives from "vuetify/directives";
const app = createApp(App);
const vuetify = createVuetify({
components,
directives,
});
app.use(vuetify).mount("#app");
// or app.use(vuetify); app.mount("#app");

In case someone like me new working on vue and nuxt. My mistake was that I did not put the s in the last. buildModule should be buildModules.
My nuxt.config.js:
export default {
buildModules:[
"#nuxtjs/vuetify"
],
module:[
"#nuxtjs/axios"
],
components:true
}

How can I insert a VueJS app into an existing page?

At this project I'm working on there is a legacy server-rendered web page and some components had problems I've been assigned to fix, and I convinced the team to rewrite those parts in Vue to kickstart our migration.
I wrote the whole mini-app using the Webpack template provided by Vue CLI and it works like a charm... in that specific environment.
If I npm run build the built index.html also works fine in a static server.
However, I can't seem to include the app in an existing page composed of many other elements. Shouldn't it be as simple as adding the <div id='myApp'></div> element to the HTML and loading the generated JS files?
If it helps, the legacy app is a Rails app using .erb templates and the JS files are being loaded through the main pipeline in application.js.
Does anyone know why nothing happens when I try this?
Edit: more information - this is how main.js looks before build:
/* eslint-disable */
import Vue from 'vue'
// UI components
import VueSelect from 'vue-select'
import DynamicForm from './components/DynamicForm/'
Vue.component('vue-select', VueSelect)
Vue.config.productionTip = false
const DynamicForms = new Vue({
el: '.dynamic-form',
render: h => h(DynamicForm)
})
Edit: I managed to get Vue to work by integrating Webpack to Rails with Webpacker. However I still have some problems regarding context:
This is my main.js in one of the Vue components. It was working fine until I tried the PropData stunt so I could reuse the component with different data in a few places.
/* eslint-disable */
import Vue from 'vue'
// UI components
import VueSelect from 'vue-select'
// import 'nouislider'
import DynamicForm from './components/DynamicForm/'
import fields from './fields'
import fieldRules from './field-rules'
Vue.component('vue-select', VueSelect)
Vue.config.productionTip = false
document.addEventListener('DOMContentLoaded', () => {
const el = document.createElement('div')
document.querySelector('.dynamic-form').appendChild(el)
const vm = new DynamicForm({
propsData: {
fields,
fieldRules
},
el,
render: h => h(DynamicForm)
})
})
This is DynamicForm/index.vue
<template>
<div id='app'>
<ParamList :fields='paramFields' :fieldRules='paramRules'></ParamList>
<Output></Output>
</div>
</template>
<script>
import Vue from 'vue'
import ParamList from './ParamList'
import Output from './Output'
export default Vue.extend({
props: [ 'fields', 'fieldRules' ],
name: 'DynamicForm',
components: {
ParamList,
Output
},
data () {
return {
paramFields: this.fields,
paramRules: this.fieldRules
}
}
})
</script>
<style>
</style>
The field and fieldData props are merely JSON/JSONP with some data I'm going to use inside those components. The idea is that I could write another main.js changing just the field and fieldData when initing the Vue instance.
What am I doing wrong?

I've managed to fix everything in a three-step change to my components.
Integrate Webpack into Rails using Webpacker. There's even a Vue template!
Change the root component (the one mounted at a real DOM element) to a Vue subclass using Vue.extend (so the module line # the .vue file read export default Vue.extend({ instead of simply export default {
Remove the render function from the new DynamicForm (the name I assigned Vue.extend to) so it renders its own template.
I hope it helps as it was quite a pain to me!

VueJs Runtime components

I'm using VueJS with my current project and when I tried to register new component and use it like <component></component> i got that runtime error. I found solution to render components like this:
import App from './components/Example.vue'
new Vue({
el: '#app',
render: h => h(App)
})
And yes It works, it really renders my component but is there any way to stick with that method of registering components ?
I've read about script to add in webpack but I'm not really sure what and where to do this is my script for running code: (watching for changes too)
watchify src/app.js -t vueify -t babelify -p browserify-hmr -p [ vueify/plugins/extract-css -o public/styles.bundle.css ] -o public/app.bundle.js

There are two ways you can use the component in your template the way you want. First, you can register the component globally.
import SomeComponent from "./SomeComponent.vue"
Vue.component("some-component", SomeComponent)
You could then use this in a template as <some-component></some-component>.
Second, you can locally register components.
import SomeComponent from "./SomeComponent.vue"
new Vue({
components:{
SomeComponent
}
})
Which, again, you could use in the template as <some-component></some-component>, but only in the root Vue. If you wanted to use it in other components you would need to import it and add it to the local components of the component you want to use it in.