# vue/require-prop-type-constructor

require prop type to be a constructor

⚙️ This rule is included in all of "plugin:vue/vue3-essential", "plugin:vue/essential", "plugin:vue/vue3-strongly-recommended", "plugin:vue/strongly-recommended", "plugin:vue/vue3-recommended" and "plugin:vue/recommended".
🔧 The --fix option on the command line (opens new window) can automatically fix some of the problems reported by this rule.

# 📖 Rule Details

This rule reports prop types that can't be presumed as constructors.

It's impossible to catch every possible case and know whether the prop type is a constructor or not, hence this rule restricts few types of nodes, instead of allowing correct ones.

The following types are forbidden and will be reported:

Literal
TemplateLiteral
BinaryExpression
UpdateExpression

It will catch most commonly made mistakes which are using strings instead of constructors.

<script>
export default {
  props: {
    /* ✓ GOOD */
    myProp: Number,
    anotherProp: [Number, String],
    myFieldWithBadType: {
      type: Object,
      default: function() {
        return {}
      },
    },
    myOtherFieldWithBadType: {
      type: Number,
      default: 1,
    },
    /* ✗ BAD */
    myProp: "Number",
    anotherProp: ["Number", "String"],
    myFieldWithBadType: {
      type: "Object",
      default: function() {
        return {}
      },
    },
    myOtherFieldWithBadType: {
      type: "Number",
      default: 1,
    },
  }
}
</script>

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# 🔧 Options

Nothing.

# 📚 Further Reading

Guide - Prop Validation (opens new window)

# 🚀 Version

This rule was introduced in eslint-plugin-vue v5.0.0

# 🔍 Implementation

← vue/require-component-is vue/require-render-return →