Utility Types

PropType<T>

Used to annotate a prop with more advanced types when using runtime props declarations.

• Example

  import { PropType } from 'vue'
  
  interface Book {
    title: string
    author: string
    year: number
  }
  
  export default {
    props: {
      book: {
        // provide more specific type to `Object`
        type: Object as PropType<Book>,
        required: true
      }
    }
  }

• See also: Guide - Typing Component Props

ComponentCustomProperties

Used to augment the component instance type to support custom global properties.

• Example

  import axios from 'axios'
  
  declare module 'vue' {
    interface ComponentCustomProperties {
      $http: typeof axios
      $translate: (key: string) => string
    }
  }

  TIP

  Augmentations must be placed in a module .ts or .d.ts file. See Type Augmentation Placement for more details.

• See also: Guide - Augmenting Global Properties

ComponentCustomOptions

Used to augment the component options type to support custom options.

• Example

  import { Route } from 'vue-router'
  
  declare module 'vue' {
    interface ComponentCustomOptions {
      beforeRouteEnter?(to: any, from: any, next: () => void): void
    }
  }

  TIP

  Augmentations must be placed in a module .ts or .d.ts file. See Type Augmentation Placement for more details.

• See also: Guide - Augmenting Custom Options

ComponentCustomProps

Used to augment allowed TSX props in order to use non-declared props on TSX elements.

• Example

  declare module 'vue' {
    interface ComponentCustomProps {
      hello?: string
    }
  }
  
  export {}

  // now works even if hello is not a declared prop
  <MyComponent hello="world" />

  TIP

  Augmentations must be placed in a module .ts or .d.ts file. See Type Augmentation Placement for more details.

CSSProperties

Used to augment allowed values in style property bindings.

• Example

  Allow any custom CSS property

  declare module 'vue' {
    interface CSSProperties {
      [key: `--${string}`]: string
    }
  }

  <div style={ { '--bg-color': 'blue' } }>

  <div :style="{ '--bg-color': 'blue' }">