The error message states: "This is not a CombinedVueInstance type when using Vue with TypeScript

Most of the time, when I use this inside a method on my vue object, it correctly gets the type CombinedVueInstance. However, there are instances where it is assigned types like Vue when accessing this in a method, and Accessors<DefaultComputed> when using it in a computed method, even though everything appears to be the same. The code snippet below illustrates this issue:

import Vue, { PropType } from 'vue'

export default Vue.extend({
  props: {
    field: Object as PropType<FieldType>,
    row: Boolean as PropType<boolean>,
    events: Object,
  },
  data() {
    return {
      value: undefined,
    }
  },
  computed: {
    required() {
      return this.field.required && !this.value
    },
    invalid() {
      return this.field.isValid && !this.field.isValid(this.value)
    }
  },

Can you explain why this does not always receive the type CombinedVueInstance within the Vue component object?

Answer №1

It's recommended to ensure your computed properties have explicit return values. This can help eliminate the error message: this not of type CombinedVueInstance in vue with typescript

computed: {
    isRequired(): boolean {
      return this.field.required && !this.value;
    },
    isInValid(): boolean {
      return this.field.isValid && !this.field.isValid(this.value);
    }
  },

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