Function defineEmits

Vue <script setup> compiler macro for declaring a component's emitted events. The expected argument is the same as the component emits option.

Example runtime declaration:

const emit = defineEmits(['change', 'update'])
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Example type-based declaration:

const emit = defineEmits<{
  // <eventName>: <expected arguments>
  change: []
  update: [value: string] // named tuple syntax
}>()

emit('change')
emit('update', 1)
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This is only usable inside <script setup>, is compiled away in the output and should not be actually called at runtime.

See

https://vuejs.org/api/sfc-script-setup.html#defineprops-defineemits