What sets defineProps<{({})}>() apart from defineProps({ }) syntax?

While examining some code written by another developer, I came across the syntax defineProps<({})>(). After doing some research, I couldn't find any resources that helped me understand this particular syntax.

My Way of Defining Props

defineProps({
 
})

How others define props

defineProps<({
 
})>()

I'm curious to know the difference between these two syntaxes.

Thank you in advance for your insights.

I'm still learning about defining props in Vue 3 script setup and wasn't aware of these two different syntax options. This question is my attempt to better understand both variations.

javascriptvue.jsvuejs3

Answer №1

The main distinction lies in the programming language used (JavaScript / TypeScript).

JS (loosely typed):

<script setup>
const props = defineProps({
  foo: String,
  bar: Number
})
</script>

TS (strongly typed):

<script setup lang="ts">
const props = defineProps<{
  foo: string
  bar?: number
}>()
</script>

In TypeScript, specifying the data type is essential, whereas in JavaScript, it's not required.

For more information, refer to: https://vuejs.org/guide/typescript/composition-api.html

Answer №2

Specify the type of data you receive in your component within the angular brackets when using TypeScript, not JavaScript.

For instance, you may be receiving props like age and name.

In JavaScript:

defineProps({
  age: number,
  name: string,
})

In TypeScript, you can do the same as in JavaScript, but any type mismatches will result in a runtime warning. Alternatively, you can define types using generics to catch errors at compile time instead of runtime. See more information here.

const props = defineProps<{
  age: number,
  name: string
}>()

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