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  <template>
      <v-container grid-list-xl fill-height>
        <v-layout column>
          <v-flex xs2>
            <div>Hello</div>
              <v-btn color="success">Success</v-btn>
          </v-flex>
        </v-layout>
      </v-container>
    </template>

import gBtn from './components/Forms/gBtn.vue'; // import vue file

const Components = {
  gBtn
};

export default Components;
export {
  gBtn
};

vue-cli-service build --target lib --name ui-core ./src/index.js

npm link

<template>
  <gBtn></gBtn>
</template>

<script>
import { gBtn } from 'ui-core';

export default {
  name: 'create-market',
  components: {
    gBtn,
  },
};
</script>

<button type="button" class="v-btn theme--light success">
      <div class="v-btn__content">Success</div>
</button>

<div class="container fluid pa-0 ma-0">
      <div data-v-6f7ae281="" class="container grid-list-xl fill-height">
        <div class="layout column">
          <div class="flex xs2"><div>Hello</div>
          </div>
        </div>
      </div>
    </div>