"Trouble arises when trying to import a Vue component into a TypeScript file

Within my Vue project, I have created a new TypeScript file named Validation.ts:

import Vue from 'vue';
import BaseInput from '@/components/base/BaseInput.vue';

class ValidationService extends Vue {
  validateFields(fields: BaseInput[]): boolean {
    return this.$store.state.skipValidation || fields.map(field => field.validate()).every(Boolean);
  }
}

export default new ValidationService();

In my BaseInput class, there is a public method called validate() that I can successfully call from other Vue components. However, TypeScript is now displaying an error because it cannot locate the BaseInput class. Following the import leads me to the shims-vue.d.ts file.

I am encountering difficulty with importing a Vue component outside of a .vue file. Is there a proper way to achieve this? Alternatively, is there a better approach for providing Vue with global TypeScript methods rather than defining them in a separate .ts file?

Answer №1

A `.vue` file consists of various sections: a template part, a script part, and a style part... and TypeScript struggles to handle them all efficiently. Components are not meant to be imported into services; their purpose is for rendering/displaying content and defining types should not be done within them.

To define types or interfaces, it's advisable to create a separate file like `./models/input.ts` where you can declare your input types:

export interface IBaseInput {
    name: string;
    ...
    ...
}
export interface IComplexInput {
    name: string;
    ...
    ...
}

Sometimes, I prefer prefixing interfaces with "I", but opinions vary on this matter (it's your choice).

Next, in your `.vue` component:

import { IBaseInput } from './models/input.ts'
class BaseInput extends Vue implements IBaseInput {
    ...
}

And in your service:

import { IBaseInput } from './models/input.ts'
class ValidationService extends Vue {
  validateFields(fields: IBaseInput[]): boolean {
    return this.$store.state.skipValidation || fields.map(field => field.validate()).every(Boolean);
  }
}

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