Is it possible to opt for an early exit in a Vue setup script

Can an early return be implemented in the Vue setup script?

<template>
  <div v-if="error || !data">Fallback content...</div>
  <div v-else>Page content...</div>
</template>

<script setup lang="ts">
// ...

const { data, error } = await fetchApi()
// Is there a way to implement an early return here? For example, something like 'if (error || !data) return'?

// ...
// There is a lot of code that might not need to run if there is an error. 
// For instance, calculating variables used only in the page content.
// ...
</script>

Note: I am transitioning from React to Vue and still learning how things work in Vue.

Answer №1

One way to handle errors is by throwing an error:

const {data, error} = await fetchApi()
if(error || !data) throw new Error('Include your specific error message here')

This action halts the execution of any subsequent code.

Answer №2

Nuxt 3 introduces the use of useFetch which provides access to data, error, and pending.

Here is an example of how it can be used:

<script setup>
import { nextTick } from 'vue';
const response = ref({});
onMounted(() => {
  nextTick(async () => {
    const { data, error, pending } = await useFetch('/api/foo');
    response.value = { data, error, pending };
    if (data) {
      // Perform a lengthy calculation
    }
  });
});
</script>

<template>
  <div>
    <div v-if="response.error || !response.data">Fallback content...</div>
    <div v-else>Page content...{{ response.data }}</div>
  </div>
</template>

For a demonstration, check out this live example

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