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require-explicit-emits.md

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Pattern: Missing explicit emits

Issue: -

Description

This rule reports event triggers not declared with the emits option. (The emits option is a new in Vue.js 3.0.0+)

Explicit emits declaration serves as self-documenting code. This can be useful for other developers to instantly understand what events the component is supposed to emit.

Also, with attribute fallthrough changes in Vue.js 3.0.0+, v-on listeners on components will fallthrough as native listeners by default. Declare it as a component-only event in emits to avoid unnecessary registration of native listeners.

<template>
  <!-- ✓ GOOD -->
  <div @click="$emit('good')"/>
  <!-- ✗ BAD -->
  <div @click="$emit('bad')"/>
</template>
<script>
export default {
  emits: ['good']
}
</script>
<script>
export default {
  emits: ['good'],
  methods: {
    foo () {
      // ✓ GOOD
      this.$emit('good')
      // ✗ BAD
      this.$emit('bad')
    }
  }
}
</script>
<script>
export default {
  emits: ['good'],
  setup (props, context) {
    // ✓ GOOD
    context.emit('good')
    // ✗ BAD
    context.emit('bad')
  }
}
</script>

Options

{
  "vue/require-explicit-emits": ["error", {
    "allowProps": false
  }]
}
  • "allowProps" ... If true, allow event names defined in props. default false

"allowProps": true

<script>
export default {
  props: ['onGood', 'bad'],
  methods: {
    foo () {
      // ✓ GOOD
      this.$emit('good')
      // ✗ BAD
      this.$emit('bad')
    }
  }
}
</script>

Further Reading