Configuring Nuxt for Composition API and TSX Support

guide.md

Main

EDIT: DO NOT USE THIS. THIS WAS FROM WHEN ALL OF THIS WAS NEW/EXPERIMENTAL AND NOT OFFICIALLY SUPPORTED. PLEASE SEE THE LINK BELOW FOR THE PROPER, EASIER INTEGRATION NOWADAYS =)

• https://typescript.nuxtjs.org/examples/composition-api/basic/

Use create-nuxt-app and enable the Typescript related options to scaffold a new boilerplate TS Nuxt repo:

yarn create nuxt-app <my-project>
# or
npx create-nuxt-app <my-project>

This should install @nuxt/typescript-runtime and @nuxt/typescript-build, plus @nuxt/eslint-config-typescript. Next, run the following:

yarn add nuxt-composition-api
yarn add --dev @nuxt/babel-preset-app babel-preset-vca-jsx@beta vue-tsx-support

vue-tsx-support is the primary provider of TSX functionality, it requires babel-preset-vca-jsx to work properly with the Composition API. @nuxt/babel-preset-app is required as the default base to build off of, so that the other plugin works.

• https://github.com/wonderful-panda/vue-tsx-support
• https://github.com/luwanquan/babel-preset-vca-jsx

In nuxt.config.(js|ts), import vue-tsx-support/enable-check (you could import it anywhere theoretically, but this seems a good spot) and configure the build.babel property, as well as add nuxt-composition-api to buildModules:

import 'vue-tsx-support/enable-check'
export default {
  // <SNIPPED>
  /*
   ** Nuxt.js dev-modules
   */
  buildModules: [
    '@nuxt/typescript-build',
    'nuxt-composition-api',
  ],

  /*
   ** Build configuration
   ** See https://nuxtjs.org/api/configuration-build/
   */
  build: {
    babel: {
      presets: ['@nuxt/babel-preset-app', 'vca-jsx'],
    },
  },

 // <SNIPPED>
}

Now you should be able to write fully type-checked TSX Components (even mixed in with regular components) using the Composition API =D

import { defineComponent, PropType } from 'nuxt-composition-api'

// This isn't necessary, but can be useful if you want to export and
// strongly type the props being passed from another component
interface MyComponentProps {
  name: string
  age: number
  address: Address
}

interface Address {
  street: string
  zip: number
}

export default defineComponent<MyComponentProps>({
  name: 'MyComponent',
  props: {
    name: String,
    age: Number,
    address: Object as PropType<Address>
  },
  setup: (props) => {
    const { name, age, address } = props
    return () => (
      <div>
        <p>{name}</p>
        <p>{age}</p>
        <p>{address.street}</p>
        <p>{address.zip}</p>
      </div>
    )
  },
})

Adding v-model Support

To add support for v-model, do the following:

yarn add --dev @vue/babel-sugar-v-model

Then, add the plugin to your nuxt-config.(js|ts):

  /*
   ** Build configuration
   ** See https://nuxtjs.org/api/configuration-build/
   */
  build: {
    babel: {
      plugins: ['module:@vue/babel-sugar-v-model'],
      presets: ['@nuxt/babel-preset-app', 'vca-jsx'],
    },
  },

Note the use of module: prefix here, this is because Babel will try to prepend babel-plugin to the package name by default. Now, you can use v-model =)

import { defineComponent, reactive } from 'nuxt-composition-api'

export default defineComponent({
  setup: (props) => {
    const state = reactive({
      text: 'changeme',
    })

    return () => (
      <div>
        <input v-model={state.text} />
        <p>Value {state.text}</p>
      </div>
    )
  },
})

how to fix this ts error?

Oh man -- please don't use this! I'm pretty sure this is now VERY outdated -- this was from back when all this stuff wasn't officially released and was super new so you couldn't find info on how to get it working easily on the internet.

Apologies for leading you on!

You should just use the (now) official, working plugins here:
https://typescript.nuxtjs.org/examples/composition-api/basic/