Package Exports

vue-property-decorator

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Readme

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 vue-class-component vue

Usage

There are several decorators:

@Prop
@Model
@Watch
@Provide
@Inject
@Emit
@Ref

Also, these are re-exported from vue-class-component

@Option
mixins
Vue

`@Prop` decorator

Description

Each prop's default value need to be defined as same as the example code shown in above. It's not supported to define each default property like @Prop() prop = 'default value' .

Example

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

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

is equivalent to

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

`@Model` decorator

Description

The first argument is the prop's name that the component accepts from its parent component. If you set the name as modelValue, then the component can use v-model .

The second argument is the same with @Prop decorator's argument.

Example

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

export default class YourComponent extends Vue {
  @Model('modelValue', { type: String, default: 'Default Value' })
  readonly value!: string
}

is equivalent to

export default {
  props: {
    modelValue: {
      type: String,
      default: 'Default Value',
    },
  },
  emits: ['update:modelValue'],
  computed: {
    value: {
      get() {
        return this.modelValue
      },
      set(newValue) {
        this.$emit('update:modelValue')
      },
    },
  },
}

`@Watch` decorator

Example

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

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

  @Watch('person', { immediate: true, deep: true })
  onPersonChanged1(val: Person, oldVal: Person) {}

  @Watch('person')
  onPersonChanged2(val: Person, oldVal: Person) {}
}

is equivalent to

export default {
  watch: {
    child: [
      {
        handler: 'onChildChanged',
      },
    ],
    person: [
      {
        handler: 'onPersonChanged1',
        immediate: true,
        deep: true,
      },
      {
        handler: 'onPersonChanged2',
      },
    ],
  },
  methods: {
    onChildChanged(val, oldVal) {},
    onPersonChanged1(val, oldVal) {},
    onPersonChanged2(val, oldVal) {},
  },
}

`@Provide` decorator

Description

If you set reactive to true, the provided value is wrapped with computed function. Provided values with reactive option dispatches their new values to child components.

Example

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

const symbolKey = Symbol()

export class MyComponent extends Vue {
  @Provide() foo = 'foo'
  @Provide({ to: 'bar' }) baz = 'bar'
  @Provide({ to: symbolKey }) nice = 'nice'
  @Provide({ reactive: true }) age = 30
}

is equivalent to

import { computed } from 'vue'

const symbolKey = Symbol()

export default {
  data() {
    return {
      foo: 'foo',
      baz: 'bar',
      nice: 'nice',
      age: 30,
    }
  },
  provide() {
    return {
      foo: this.key,
      bar: this.baz,
      [symbolKey]: this.nice,
      age: computed(() => this.age),
    }
  },
}

`@Inject` decorator

Example

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

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

is equivalent to

export default {
  inject: {
    foo: 'foo',
    baz: {
      from: 'bar',
    },
    nice: {
      default: '',
    },
  },
}

`@Emit` decorator

Description

The functions decorated by @Emit $emit their return value followed by their original arguments. If the return value is a promise, it is resolved before being emitted.

If the name of the event is not supplied via the event argument, the function name is used instead. In that case, the camelCase name will be converted to kebab-case.

Example

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

export default class YourComponent extends Vue {
  count = 0

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

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

  @Emit()
  returnValue() {
    return 10
  }

  @Emit()
  onInputChange(e) {
    return e.target.value
  }

  @Emit()
  promise() {
    return new Promise((resolve) => {
      setTimeout(() => {
        resolve(20)
      }, 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')
    },
    returnValue() {
      this.$emit('return-value', 10)
    },
    onInputChange(e) {
      this.$emit('on-input-change', e.target.value, e)
    },
    promise() {
      const promise = new Promise((resolve) => {
        setTimeout(() => {
          resolve(20)
        }, 0)
      })

      promise.then((value) => {
        this.$emit('promise', value)
      })
    },
  },
}

`@Ref` decorator

Example

import { Vue, Ref } from 'vue-property-decorator'
import AnotherComponent from '@/path/to/another-component.vue'

export default class YourComponent extends Vue {
  @Ref() readonly anotherComponent!: AnotherComponent
  @Ref('aButton') readonly button!: HTMLButtonElement
}

is equivalent to

export default {
  computed() {
    anotherComponent: {
      cache: false,
      get() {
        return this.$refs.anotherComponent as AnotherComponent
      }
    },
    button: {
      cache: false,
      get() {
        return this.$refs.aButton as HTMLButtonElement
      }
    }
  }
}