Nuxt Property Decorator

Handy ES / TypeScript decorators for class-style Vue components in Nuxt (based on Vue class component) and Property decorators for Vue (bases on Vue Property Decorator) and Vuex (based on Vuex Class)

This library fully depends on vue-class-component.

License

MIT License

Install

Installation is very easy

npm i -S nuxt-property-decorator

or

yarn add nuxt-property-decorator

Nuxt JS Instructions

Currently decorators need the following two Babel plugins to work @babel/plugin-proposal-decorators,"@babel/plugin-proposal-class-properties. Latest Nuxt already adds them for us, the only thing we need is to add loose parameter to @nuxt/babel-preset-app. Just add this to nuxt-config

. build: { babel: { presets({ isServer }) { return [ [ "@nuxt/babel-preset-app", { loose: true } ] ] } } } (as there is an issue with @nuxt/babel-preset-app, meanwhile just use the following config)

  build: {
    babel: {
      plugins: [
        ["@babel/plugin-proposal-decorators", { legacy: true }],
        ["@babel/plugin-proposal-class-properties", { loose: true }]
      ]
    }
  }

Nuxt TS Instructions

It works out of the box with Nuxt TS.

Decorators and helpers

There are following decorators:

• exported from vue-class-component

  • @Component

• exported from vue-property-decorator

  • @Emit
  • @Inject
  • @InjectReactive
  • @Model
  • @Prop
  • @PropSync
  • @Provide
  • @ProvideReactive
  • @Ref
  • @Watch

• exported from vuex-class

  • @State
  • @Getter
  • @Action
  • @Mutation

Other exports

• namespace
• mixins
• Vue

Hooks

Vue Router hooks

• beforeRouteEnter
• beforeRouteUpdate
• beforeRouteLeave

Nuxt hooks

• asyncData
• fetch
• head
• key
• layout
• loading
• middleware
• scrollToTop
• transition
• validate
• watchQuery

Vue-class Hooks

• data
• beforeCreate
• created
• beforeMount
• mounted
• beforeDestroy
• destroyed
• beforeUpdate
• updated
• activated
• deactivated
• render
• errorCaptured
• serverPrefetch

Usage

import { Component, Inject, Model, Prop, Provide, Vue, Watch } from 'nuxt-property-decorator'

const s = Symbol('baz')

@Component({
  components: { comp }
})
export class MyComponent extends Vue {

  @Inject() foo!: string
  @Inject('bar') bar!: string
  @Inject(s) baz!: string

  @Model('change') checked!: boolean

  @Prop()
  propA!: number

  @Prop({ default: 'default value' })
  propB!: string

  @Prop([String, Boolean])
  propC!: string | boolean

  @Prop({ type: null })
  propD!: any

  @Provide() foo = 'foo'
  @Provide('bar') baz = 'bar'
 
  @Watch('child')
  onChildChanged(val: string, oldVal: string) { }

  @Watch('person', { immediate: true, deep: true })
  onPersonChanged(val: Person, oldVal: Person) { }
  
  beforeRouteLeave (to, from, next) {
    // called when the route that renders this component is about to
    // be navigated away from.
    // has access to `this` component instance.
  }
}

is equivalent to

const s = Symbol('baz')

export const MyComponent = Vue.extend({
  name: 'MyComponent',
  components: { comp },
  inject: {
    foo: 'foo',
    bar: 'bar',
    [s]: s
  },
  model: {
    prop: 'checked',
    event: 'change'
  },
  props: {
    checked: Boolean,
    propA: Number,
    propB: {
      type: String,
      default: 'default value'
    },
    propC: [String, Boolean],
    propD: { type: null }
  },
  data () {
    return {
      foo: 'foo',
      baz: 'bar'
    }
  },
  provide () {
    return {
      foo: this.foo,
      bar: this.baz
    }
  },
  methods: {
    onChildChanged(val, oldVal) { },
    onPersonChanged(val, oldVal) { }
  },
  beforeRouteLeave (to, from, next) {
    // called when the route that renders this component is about to
    // be navigated away from.
    // has access to `this` component instance.
  },
  watch: {
    'child': {
      handler: 'onChildChanged',
      immediate: false,
      deep: false
    },
    'person': {
      handler: 'onPersonChanged',
      immediate: true,
      deep: true
    }
  }
})

As you can see at propA and propB, the type can be inferred automatically when it's a simple type. For more complex types like enums you do need to specify it specifically. Also this library needs to have emitDecoratorMetadata set to true for this to work.

Useful links

See also:

• Vue Property Decorator
• Vue class component
• Vuex Class
• Nuxt Class Component