Vue3 onMounted function doesn’t work in esm package bundled with rollup


I bundled a vue3 component with rollup. The component is simple:

// main.vue
<template>
  <div>
    <div @click="clickDiv">{{ 1 }}</div>
    <div ref="divRef"></div>
  </div>
</template>
<script>
import { onMounted, ref, defineComponent } from 'vue'
export default defineComponent({
  name: 'Vue3Component',
  mounted () {
    console.log('component mounted') // it works well
  },
  setup() {
    const divRef = ref()
    const clickDiv = () => {
      console.log('divRef', divRef) // it causes some warnings
    }
    onMounted(() => {
      console.log('component onMounted') // it causes some warnings
    })
    return {
      a: ref(1),
      clickDiv,
      divRef
    }
  },
})
</script>

and the input entry:

// index.js
import Vue3Component from './main.vue'
Vue3Component.install = (app) => {
  app.component(Vue3Component.name, Vue3Component)
}

export {
  Vue3Component
}

rollup config code:

// rollup.config.js
import resolve from '@rollup/plugin-node-resolve'
import commonjs from '@rollup/plugin-commonjs'
import pkg from './package.json'
import external from 'rollup-plugin-peer-deps-external'
import vuePlugin from 'rollup-plugin-vue'

const extensions = ['.vue', '.js']

const globals = {
  vue: 'Vue',
  'highlight.js': 'hljs',
  'marked': 'marked'
}

export default [
  {
    input: 'src/index.js',
    output: [
      {
        name: 'VueNextMEditor',
        file: pkg.main,
        format: 'umd',
        globals
      },
      {
        file: pkg.module,
        format: 'es'
      },
      {
        name: 'VueNextMEditor',
        file: pkg.unpkg,
        format: 'umd',
        plugins: [terser()],
        globals
      }
    ],
    plugins: [
      external(),
      vuePlugin(),
      resolve(),
      commonjs({ extensions })
    ]
  }
]

When i test the component locally with vue-cli, the onMounted in setup doesn’t works. The browser shows error like this:

[Vue warn]: onMounted is called when there is no active component instance to be associated with. Lifecycle injection APIs can only be used during execution of setup(). If you are using async setup(), make sure to register lifecycle hooks before the first await statement.
[Vue warn]: Missing ref owner context. ref cannot be used on hoisted vnodes. A vnode with ref must be created inside the render function. 
  at <Vue3Component> 
  at <App>

But mounted outside the setup function works will.
Anyone can help me to resolve this problem?
Vue3Component

Source: JavaSript – Stack Overflow

November 30, 2021
Category : News
Tags: javascript | rollup | vuejs3

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Senior Software Developer

Creator of @LzoMedia I am a backend software developer based in London who likes beautiful code and has an adherence to standards & love's open-source.