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you have to import it in your component. webpack manage the dependencies.
If you have used vue init webpack
you are also using vue-loader so for adding jquery to the Hallo component you can do like this
first as you have already done npm install --save jquery
After that open the file App.vue and in the section add the import:
<script>
import Hello from './components/Hello'
import jquery from 'jquery'
export default {
name: 'app',
components: {
Hello
}
}
</script>
Not sure is what are you looking for but this is how you can add a 3rd party lib
Source:stackexchange.com