Nuxt•7d ago

The best practice for using typescript on NuxtJS3

How to make types for the response data that we get by using typescript on NuxtJS3.

2 Replies

Hi @Adnan Erlansyah. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- To use TypeScript effectively with Nuxt 3 and create types for response data, here are some best practices: 1. Enable TypeScript support in your Nuxt 3 project: - Ensure you have typescript and vue-tsc installed as dev dependencies. - Set typeCheck: true in your nuxt.config.ts file to enable type-checking Nuxt TypeScript docs (https://nuxt.com/docs/api/nuxt-config#typecheck). 2. Create a tsconfig.json file in your project root that extends the auto-generated types:

{
  "extends": "./.nuxt/tsconfig.json"
}

{
  "extends": "./.nuxt/tsconfig.json"
}

This allows you to leverage Nuxt's auto-generated types Nuxt TypeScript docs (https://nuxt.com/docs/guide/directory-structure/tsconfig). 3. For API routes and data fetching, Nuxt 3 automatically generates types for your API routes when you return a value instead of using res.end() Typed API Routes (https://nuxt.com/docs/guide/concepts/server-engine#typed-api-routes). 4. When using useFetch or $fetch, you can specify the expected type of the response data:

<script setup lang="ts">
import type { ParsedContent } from '@nuxt/content'

interface MyCustomParsedContent extends ParsedContent {
  yourOwn: 'keys'
  foo: 'bar'
  baz: 'bar'
}

const { data } = await useAsyncData(
  () => queryContent<MyCustomParsedContent>({ ...anyQuery })
)
</script>

<script setup lang="ts">
import type { ParsedContent } from '@nuxt/content'

interface MyCustomParsedContent extends ParsedContent {
  yourOwn: 'keys'
  foo: 'bar'
  baz: 'bar'
}

const { data } = await useAsyncData(
  () => queryContent<MyCustomParsedContent>({ ...anyQuery })
)
</script>

This example shows how to extend the ParsedContent type for custom front-matter keys Nuxt Content TypeScript Support (https://content.nuxt.com/usage/typescript/). 5. For Markdown-specific content, you can extend the MarkdownParsedContent type:

<script setup lang="ts">
import type { MarkdownParsedContent } from '@nuxt/content'

interface Article extends MarkdownParsedContent {
  author: string
}
const { data } = await useAsyncData(
  'first-article',
  () => queryContent<Article>('articles').findOne()
)
</script>

<script setup lang="ts">
import type { MarkdownParsedContent } from '@nuxt/content'

interface Article extends MarkdownParsedContent {
  author: string
}
const { data } = await useAsyncData(
  'first-article',
  () => queryContent<Article>('articles').findOne()
)
</script>

This provides improved type-safety for Markdown content Nuxt Content TypeScript Support (https://content.nuxt.com/usage/typescript/). 6. If you need to use a custom serializer, you can maintain type safety by utilizing the toJSON method:

<script setup lang="ts">
import superjson from 'superjson'

const { data } = await useFetch('/api/superjson', {
  transform: (value) => {
    return superjson.parse(value as unknown as string)
  },
})
</script>

<script setup lang="ts">
import superjson from 'superjson'

const { data } = await useFetch('/api/superjson', {
  transform: (value) => {
    return superjson.parse(value as unknown as string)
  },
})
</script>

This example uses superjson as a custom serializer while maintaining type safety Nuxt Data Fetching (https://nuxt.com/docs/getting-started/data-fetching#using-an-alternative-serializer). By following these practices, you can effectively use TypeScript in your Nuxt 3 project and create proper types for your response data. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•7d ago

<@1079709612078534676> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

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The best practice for using typescript on NuxtJS3