Steps to define a JavaScript mixin in VueJS

Question

Steps to define a JavaScript mixin in VueJS

Currently, I am working on a Vue project with TypeScript and in need of using a mixin from a third-party library written in JavaScript. How can I create a .d.ts file to help TypeScript recognize the functions defined in the mixin?

I have attempted the following approach, but it did not work as expected:

// common.d.ts
declare module 'third-party-lib' {
    import { VueClass } from 'vue-class-component/lib/declarations';

    export interface SomeMixin<T> extends VueClass<T> {
        refresh(): Promise<void>;
    }
}

// index.ts
import { Component, Mixins } from 'vue-property-decorator';
import { SomeMixin } from 'third-party-lib';

@Component
export default class Index extends Mixins(SomeMixin) {
    public foo() {
        this.refresh(); // 'refresh' is not defined.
    }
}

javascript typescript vue.js

Answer 1

Answer №1

If you want to enhance a third-party mixin, you can achieve this by creating a new file named vuelidate-error-extractor.d.ts:

declare module 'vuelidate-error-extractor' {
   import { ValidationRule } from 'vuelidate/lib/validators';

   // Ensure the following class extends Vue
   export class singleErrorExtractorMixin extends Vue {
      readonly events: any;

      readonly name: string;

      readonly isValid: boolean;

      readonly hasErrors: boolean;

      readonly preferredValidator: ValidationRule;
   }
}

This modification is designed to complement this original JS file, although it may be incomplete.

Answer 2

If you want to enhance a third-party mixin, you can achieve this by creating a new file named vuelidate-error-extractor.d.ts:

declare module 'vuelidate-error-extractor' {
   import { ValidationRule } from 'vuelidate/lib/validators';

   // Ensure the following class extends Vue
   export class singleErrorExtractorMixin extends Vue {
      readonly events: any;

      readonly name: string;

      readonly isValid: boolean;

      readonly hasErrors: boolean;

      readonly preferredValidator: ValidationRule;
   }
}

This modification is designed to complement this original JS file, although it may be incomplete.

Answer 3

Answer №2

You can find detailed information about this concept in the article "Extending Types for Integration with Plugins".

To implement this functionality, create a new file with a .d.ts extension within your project and add the following code to enable the refresh() mixin method for components:

// 1. Ensure 'vue' is imported before defining augmented types
import Vue from 'vue'

// 2. Specify the file containing the types you wish to extend
//    The constructor type for Vue is found in types/vue.d.ts
declare module 'vue/types/vue' {
  // 3. Define the augmentation for Vue
  interface Vue {
    refresh(): void;
  }
}

Answer 4

You can find detailed information about this concept in the article "Extending Types for Integration with Plugins".

To implement this functionality, create a new file with a .d.ts extension within your project and add the following code to enable the refresh() mixin method for components:

// 1. Ensure 'vue' is imported before defining augmented types
import Vue from 'vue'

// 2. Specify the file containing the types you wish to extend
//    The constructor type for Vue is found in types/vue.d.ts
declare module 'vue/types/vue' {
  // 3. Define the augmentation for Vue
  interface Vue {
    refresh(): void;
  }
}

Steps to define a JavaScript mixin in VueJS

Answer №1

Answer №2

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