TypeScript

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<script lang="ts">
import { defineComponent } from 'vue';
export default defineComponent({
  name: 'HelloWorld',
  props: {
    msg: String,
  },
});
</script>

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<script lang="ts">
import { defineComponent } from 'vue';
export default defineComponent({
  name: 'HelloWorld',
  props: {
    msg: {
      required: true,
      type: String
    },
  },
  setup(props, context) {
    props.msg
  }
});
</script>