The Vue component's TypeScript object prop type does not match the expected value

Having trouble with the type of Object properties in Vue Single File Components using TypeScript (created with Vue CLI 3)? Check out the example below to see the issue.

The type of this.product is currently showing as

(() => any) | ComputedOptions<any>
. Seeking a solution, does anyone have any suggestions?

<script lang="ts">
import Vue, { PropType } from 'vue';

interface ProductInterface {
  units: number;
}

export default Vue.extend({
  name: 'Product',
  props: {
    product: {
      type: Object as PropType<ProductInterface>,
      required: true,
    },
  },
  computed: {
    unitsString() {
      return `${this.product.units} Units`;
    },
  },
});
</script>

Answer №1

Have you attempted to specify a return type for the computed property like shown below?

unitsString() :string{
  return ... 
}

It seems that Typescript combined with Vue may behave unexpectedly when dealing with inferred computed properties.

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