Using the plus operator in Typescript is not compatible with the type of functions

I am encountering an error in my Vue component with Typescript, even though I have correctly declared types. The error pertains to the line mentioned in the title of this issue and below is a simplified version of the component causing the problem:

import Vue from 'vue';
const Component = Vue.extend({
  props: {
    value: {
      type: Number,
      default: null
    },
    index: {
      type: Number,
      required: true
    }
  },
  computed: {
    stepNumber(): number {
      return this.index + 1;
    }
  }
})

export default Component;

The specific issue arises with "this.index+1". Even though I specified the type as 'number' for the prop 'index', the error persists. Any insights on why this might be happening?

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