Nuxt•5mo ago

Adding a watcher inside `useAsyncData`

Hi. I've wrapped useAsyncData in order to add some error handling:

  async function myAsyncData<T>(...args: AsyncArgs<T>) {
    const { error, ...rest } = await useAsyncData<T>(...args);
    return { error: computed(() => humanReadableError(error)), ...rest };
  }

  async function myAsyncData<T>(...args: AsyncArgs<T>) {
    const { error, ...rest } = await useAsyncData<T>(...args);
    return { error: computed(() => humanReadableError(error)), ...rest };
  }

However now I want to submit an error to sentry in case of errors. If I use error.value inside myAsyncData, i'll lose reactivity so I don't want to do that. However I can add a watcher on error and that seems to work:

  async function myAsyncData<T>(...args: AsyncArgs<T>) {
    const { error, ...rest } = await useAsyncData<T>(...args);
    watch(error, () => {
      console.error(error);
      // Error reporting here
    });
    return { error: computed(() => humanReadableError(error)), ...rest };
  }

  async function myAsyncData<T>(...args: AsyncArgs<T>) {
    const { error, ...rest } = await useAsyncData<T>(...args);
    watch(error, () => {
      console.error(error);
      // Error reporting here
    });
    return { error: computed(() => humanReadableError(error)), ...rest };
  }

However something about this approach seems wrong to me. Is using a watcher like this bad practice? If not, do I need to manually unsubscribe the watcher on unMount? Is there a better way to do this?

2 Replies

Mähh•5mo ago

When the goal is to send something to your monitoring in case of failed fetch, whats about creating a own fetch instance for it?

export const $myCustomFetch = $fetch.create({
    onRequestError(context) {
        // send error to monitoring service api
    }
})

export const $myCustomFetch = $fetch.create({
    onRequestError(context) {
        // send error to monitoring service api
    }
})

<script setup lang="ts">
const {data} = await useAsyncData('my-key', async () => $myCustomFetch('/foo'))
</script>

<script setup lang="ts">
const {data} = await useAsyncData('my-key', async () => $myCustomFetch('/foo'))
</script>

MikeOP•5mo ago

Good point, I think I'll do this. I have to intercept onResponseError but this works. Thank you! 🙂

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Adding a watcher inside `useAsyncData`