vue2 configList immediate true handlernewItems consolelognewItems; deep true

This code is defining a configList property in a Vue 2 component.

The configList property is an object that has three keys:

1. immediate: This key is set to true, which means that the handler function will be called immediately when the component is created.

2. handler: This key is a function that will be called whenever the configList property is updated. The newItems parameter in the function represents the new value of the configList property.

3. deep: This key is set to true, which means that the handler function will also be called if any nested properties of the configList object are modified.

In this case, the handler function simply prints the newItems value to the console.