Creating a Custom Hot Module Replacement Hook for Vue.js and Webpack

Is there a way to create a hook that triggers when a Vue component is updated using hot module replacement?

[HMR] App is up to date.

Now I want to execute a specific method after the update.

Answer №1

After delving into webpack HMR, I stumbled upon two helpful methods: dispose and removeDisposeHandler.

Utilizing dispose

By adding a handler using this method, it gets executed when the current module code is replaced. It's best suited for removing any persistent resources that have been claimed or created. If you need to transfer state to the updated module, include it in the provided data parameter. This data object will be accessible at module.hot.data after the update.

Using removeDisposeHandler

This function allows you to remove the handler that was added through dispose or addDisposeHandler.

To implement this, I included dispose in the created hook and removed it in the destroyed hook as shown below:

export default {
  methods: {
    callback(data) {
      console.log(data)
    },
  },
  created() {
    if (module.hot) {
      module.hot.dispose(this.callback)
    } 
  },
  destroyed() {
    if (module.hot) {
      module.hot.removeDisposeHandler(this.callback)
    }
  },
}

I conducted tests within my Vue CLI app and achieved perfect results: the callback function triggers precisely when the module is changed, but remains inactive for other modules.

Answer №2

Shoutout to @Javas for the helpful hint. The solution I've been seeking is revealed below:

module.hot.addStatusHandler(status => {
    console.log('module hot status', status)
});

I have integrated this code snippet into my entry file, ensuring that it gets executed whenever any components undergo hot-reloading.

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