Vue Property Decorator

This library fully depends on vue-class-component, so please read its README before using this library.

License

MIT License

Install

npm i -S vue-property-decorator

Usage

There are 7 decorators and 1 function (Mixin):

• @Emit
• @Inject
• @Model
• @Prop
• @Provide
• @Watch
• @Component (from vue-class-component)
• Mixins (the helper function named mixins defined at vue-class-component)

@Prop(options: (PropOptions | Constructor[] | Constructor) = {}) decorator

import { Vue, Component, Prop } from 'vue-property-decorator'

@Component
export default class YourComponent extends Vue {
  @Prop(Number) propA!: number
  @Prop({ default: 'default value' }) propB!: string
  @Prop([String, Boolean]) propC: string | boolean
}

is equivalent to

export default {
  props: {
    propA: {
      type: Number
    },
    propB: {
      default: 'default value'
    },
    propC: {
      type: [String, Boolean]
    },
  }
}

Note that:

• reflect-metada isn't used in this library and setting emitDecoratorMetadata to true means nothing.
• Each prop's default value need to be defined as same as the example code shown in above.

@Model(event?: string, options: (PropOptions | Constructor[] | Constructor) = {}) decorator

import { Vue, Component, Model } from 'vue-property-decorator'

@Component
export default class YourComponent extends Vue {
  @Model('change', { type: Boolean }) checked!: boolean
}

is equivalent to

export default {
  model: {
    prop: 'checked',
    event: 'change'
  },
  props: {
    checked: {
      type: Boolean
    },
  },
}

@Watch(path: string, options: WatchOptions = {}) decorator

import { Vue, Component, Watch } from 'vue-property-decorator'

@Component
export default class YourComponent extends Vue {
  @Watch('child')
  onChildChanged(val: string, oldVal: string) { }

  @Watch('person', { immediate: true, deep: true })
  onPersonChanged(val: Person, oldVal: Person) { }
}

is equivalent to

export default {
  watch: {
    'child': {
      handler: 'onChildChanged',
      immediate: false,
      deep: false
    },
    'person': {
      handler: 'onPersonChanged',
      immediate: true,
      deep: true
    }
  },
  methods: {
    onChildChanged(val, oldVal) { },
    onPersonChanged(val, oldVal) { }
  }
}

@Emit(event?: string) decorator

The functions decorated by @Emit $emit their arguments after they ran.

import { Vue, Component, Emit } from 'vue-property-decorator'

@Component
export default class YourComponent extends Vue {
  count = 0

  @Emit()
  addToCount(n: number) {
    this.count += n
  }

  @Emit('reset')
  resetCount() {
    this.count = 0
  }
}

is equivalent to

export default {
  data() {
    return {
      count: 0
    }
  },
  methods: {
    addToCount(n) {
      this.count += n
      this.$emit('add-to-count', n)
    },
    resetCount() {
      this.count = 0
      this.$emit('reset')
    }
  }
}

@Provide(key?: string | symbol) / @Inject(options?: { from?: InjectKey, default?: any } | InjectKey) decorator

import { Component, Inject, Provide, Vue } from 'vue-property-decorator'

const symbol = Symbol('baz')

@Component
export class MyComponent extends Vue {
  @Inject() foo!: string
  @Inject('bar') bar!: string
  @Inject({ from: 'optional', default: 'default' }) optional!: string
  @Inject(symbol) baz!: string


  @Provide() foo = 'foo'
  @Provide('bar') baz = 'bar'
}

is equivalent to

const symbol = Symbol('baz')

export const MyComponent = Vue.extend({

  inject: {
    foo: 'foo',
    bar: 'bar',
    'optional': { from: 'optional', default: 'default' },
    [symbol]: symbol
  },
  data () {
    return {
      foo: 'foo',
      baz: 'bar'
    }
  },
  provide () {
    return {
      foo: this.foo,
      bar: this.baz
    }
  }
})

See also

vuex-class