Using TypeScript with Nuxt/Vue.js: The 'components' property cannot be specified in an object literal as it is not recognized in the 'VueClass' type

Question

Using TypeScript with Nuxt/Vue.js: The 'components' property cannot be specified in an object literal as it is not recognized in the 'VueClass' type

I am puzzled by the error message I am receiving when using a decorator in conjunction with components and middleware:

https://i.sstatic.net/dutqx.png

When I examine the error, it states:

TS2345: Argument of type '{ components: { Test: typeof Nav; }; middleware: string[]; }' is not assignable to parameter of type 'VueClass'.
  Object literal may only specify known properties, but 'components' does not exist in type 'VueClass'. Did you mean to write 'component'?

https://i.sstatic.net/vEr1p.png

Remarkably, the @Component decorator functions perfectly fine when middleware is not involved:

https://i.sstatic.net/FMp5P.png

Any thoughts on why this issue is occurring?

typescript vue.js nuxt.js

Answer 1

Answer №1

It's important to note that the middleware is not a standard Vue property but rather a specific property defined by Nuxt. The error message may seem misleading as it appears to be related to the components property, but in reality, it's indicating that an object containing both

{components: ..., middleware: ...}

does not align with the expected types.

To resolve this issue, you can update the Vue ComponentOptions type by adding the middleware property. This can be achieved by creating a new .d.ts file (or modifying an existing type file like references.d.ts) and including the following declaration:

// references.d.ts
/**
 * Extends interfaces in Vue.js
 */

import Vue, { ComponentOptions } from "vue";

declare module "vue/types/options" {
  interface ComponentOptions<V extends Vue> {
    // The addition of the `middleware` property to the existing `vue/types/options/ComponentOptions` type
    middleware?: string | string[];
  }
}

This process is similar to how the Vuex plugin introduces the store property to the Vue component type. For a reference, you can check out the vuex/types/vue.d.ts source to see how it's implemented.

Answer 2

It's important to note that the middleware is not a standard Vue property but rather a specific property defined by Nuxt. The error message may seem misleading as it appears to be related to the components property, but in reality, it's indicating that an object containing both

{components: ..., middleware: ...}

does not align with the expected types.

To resolve this issue, you can update the Vue ComponentOptions type by adding the middleware property. This can be achieved by creating a new .d.ts file (or modifying an existing type file like references.d.ts) and including the following declaration:

// references.d.ts
/**
 * Extends interfaces in Vue.js
 */

import Vue, { ComponentOptions } from "vue";

declare module "vue/types/options" {
  interface ComponentOptions<V extends Vue> {
    // The addition of the `middleware` property to the existing `vue/types/options/ComponentOptions` type
    middleware?: string | string[];
  }
}

This process is similar to how the Vuex plugin introduces the store property to the Vue component type. For a reference, you can check out the vuex/types/vue.d.ts source to see how it's implemented.

Using TypeScript with Nuxt/Vue.js: The 'components' property cannot be specified in an object literal as it is not recognized in the 'VueClass' type

Answer №1

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