You may encounter an error stating "Property X does not exist on type 'Vue'" when attempting to access somePropOrMethod on this.$parent or this.$root in your code

When using VueJS with TypeScript, trying to access a property or method using this.$parent.somePropOrMethod or this.$root.somePropOrMethod can lead to a type error stating that

Property somePropOrMethod does not exist on type 'Vue'

The defined interface for Vue is as follows:

export interface Vue {
   ...
   readonly $parent: Vue;
   readonly $root: Vue;
   ...
   }

This raises the question of how one should go about accessing properties and methods on parent or root elements in a way that maintains type safety.

It appears like the interface should be Vue & {[key: string]: any} in order to permit unknown properties and methods within the $root and $parent attributes.

Answer №1

When dealing with typescript type errors, my usual approach is to either extend a custom interface or simply set the type as 'any'. Although I am unsure if this is considered a standard practice...

Extending Custom Interface

export interface _Vue extends Vue {
  somePropOrMethod: any,
  forStringProp: String
}

Setting Type as Any

(this.$parent as any).somePropOrMethod

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