"compilerOptions": {
    ...
    "target": "esnext",
    "module": "esnext",
    "strict": true,
    "noImplicitAny": false,
    "noImplicitThis": false,
    ...
}

x: [String, Number, Array as () => Array<string | number>]

<script lang="ts">
import Vue from "vue"
type ComplexObjectInterface = {
  testProp: string
  modelName: number
}
export default Vue.extend({
  props: {
    propExample: {
      type: Object as () => ComplexObjectInterface
    }
  },
  data() {
    return {
      dataExample: "This Property Will Be Data"
    }
  },
  computed: {
    computedExample(): string {
      return (
        this.dataExample +
        this.propExample.testProp +
        "Computed Property Example"
      )
    }
  },
  methods: {
    methodExample() {
      this.dataExample = "This is being done in a method"
    }
  }
})
</script>