When using `defineModel` in Vue, the returned value can be either an object or

defineModel() is a new feature introduced in Vue 3.4+. The official documentation provides the following example:

const model = defineModel()
model.value = 'hello'

Initially, it appears that model is an object with a value property.

However, there is another example provided later on:

const [modelValue, modelModifiers] = defineModel()

This case introduces some confusion as it seems like the result of defineModel() is actually an array containing modelValue and modelModifiers.

I am trying to make sense of these examples, but it seems like there is some sort of "magic" happening behind the scenes. Can anyone offer further explanation or insights? Thank you.

Answer №1

In the realm of Vue script setup, Joromanda X shared valuable insights in the comments, likening this to a seamless macro that operates on the principle of 'it just works'.

If you're intrigued by the specifics (as I was), here's what I discovered:

Within Javascript, a conventional object can serve as an iterator. The macro essentially converts your defineModel function call into a new function called useModel, with further details available here for implementation purposes.

This resulting function generates an object that acts as a Vue ref (allowing the use of .value). By deconstructing it using array syntax, you're able to access both the model and modifiers. The initial object returned by the iterator represents the combined ref/iterator itself.

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