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What is Async Components in Vue js?

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In large applications, we may need to divide the app into smaller chunks and only load a component from the server when it’s needed. To make that easier, Vue allows you to define our component as a factory function that asynchronously resolves your component definition. Vue will only trigger the factory function when the component needs to be rendered and will cache the result for future re-renders. For example:

As we can see, the factory function receives a resolve callback, which should be called when we have retrieved your component definition from the server. We can also call reject(reason) to indicate the load has failed.