Vue is not a constructor

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I using webpack, after build and run in chrome show this error,I don't know how to solve it.

My code is very simple:

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{ "devDependencies": { "babel-core": "^6.23.1", "babel-loader": "^6.3.2", "babel-plugin-transform-runtime": "^6.23.0", "babel-preset-es2015": "^6.22.0", "babel-runtime": "5", "css-loader": "^0.26.1", "html-webpack-plugin": "^2.28.0", "vue-hot-reload-api": "^2.0.9", "vue-html-loader": "^1.2.3", "vue-loader": "10.0.3", "vue-style-loader": "^2.0.0", "vue-template-compiler": "^2.1.10", "webpack": "^2.2.1", "webpack-dev-server": "^2.4.1" }, "dependencies": { "vue": "^2.1.10" } }
3

5 Answers

The issue is that Vue latest library has been updated, so we need to specify the version in the script tag

Please, replace the tag

<script src="https://cdn.jsdelivr.net/npm/vue"></script>

By

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/vue.min.js"></script>

2

Vue is the default export from that library so you import like this.

import Vue from 'vue'
4

I faced this problem while I was learning Vue. My tutorial was from Vue 2 and I was using Vue 3.

So I solved it by replacing

let app = new Vue({ el: "#app", data: { message: "Hello Vue!", }, });

to this

const { createApp } = Vue; createApp({ data() { return { message: "Hello Vue!", }; }, }).mount("#app");

You need to import the runtime only build. This comment in the Github issues explains.

Put this in your webpack.config.js.

resolve: { alias: { vue: 'vue/dist/vue.js' } }
2

i just replace this file

<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>

to

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/vue.js"></script>

in my code and the error ("Vue is not a constructor") is remove

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