add index.js file in src add add required components

import Vue from 'vue';
import GoogleMaps from "@/components/google-maps.vue";
const Components = {
    GoogleMaps,
};
Object.keys(Components).forEach(name => {
    Vue.component(name, Components[name]);
});
export default Components


add package name and files in package json file like this:

"name": "google-maps-vue",
"files": [
  "dist/*",
  "src/*",
  "public/*",
  "*.json",
  "*.js",
  "plugins/*"
]
add dist path in package json
"main": "./dist/google-maps.js",

add build command in package json file

"build-bundle": "vue-cli-service build --target lib --name google-maps ./src/components/index.js"

add command to publish

npm publish --access public

http://parseobjects.com/publish-vue-js-components-npm/