Enforce a getter and or a setter at computed properties

[ndabAP]

Please describe what the rule should do: Enforce a getter and or a setter at computed properties to coerce correct usage and make the target clear.

What category should the rule belong to?

• [ ] Enforces code style
• [x] Warns about a potential error
• [ ] Suggests an alternate way of doing something
• [ ] Other (please specify:)

Provide 2-3 code examples that this rule should warn about:

<script>
export default {
  computed: {
    // Warning: Use getter instead
    fullName () {
      return this.firstName + ' ' + this.lastName
    }
  }
}
</script>

Additional context Maybe: "vue/require-get-set-in-computed".