The issue of Eslint flagging a no-unused-vars error when actually using an interface in a

Currently, I'm working with Vue along with Vue CLI and Typescript.
I have imported an interface from a Vuex file and utilized it for type annotation in mapState.
However, I am encountering an error flagged by eslint.

'State' is defined but never used. eslint(no-unused-vars)


Here's the code snippet:

import { Component, Vue } from 'vue-property-decorator';
import { mapState } from 'vuex';
import { State } from '@/store/index';

@Component({
  computed: mapState<State>({
    cards: (state: State) => state.user.cards,
  })
})
export default class Home extends Vue {}

.eslintrc.js

module.exports = {
  root: true,
  env: {
    node: true
  },
  'extends': [
    'plugin:vue/essential',
    'eslint:recommended',
    '@vue/typescript'
  ],
  rules: {
    'no-console': process.env.NODE_ENV === 'production' ? 'error' : 'off',
    'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'off',
    'quotes': ['error', 'single'],
    'semi': ['warn', 'always']
  },
  parserOptions: {
    parser: '@typescript-eslint/parser'
  }
};


How can I resolve this eslint error?

Answer №1

Resolution:

The EsLint default rule no-unused-vars contains a bug that manifests in the manner described. As per my reference [1], this issue can be rectified by utilizing

@typescript-eslint/no-unused-vars
as shown below:

overrides: [
   // Addressing no-used-vars when importing TypeScript types in .vue files
   {
     files: ["*.vue"],
     rules: {
        'no-unused-vars': 'off',
        '@typescript-eslint/no-unused-vars': 'error'
     }
  }
]

Reference [2] refers to another discussion on the same subject, where my suggested approach [1] is proposed alongside other alternatives. In references [2] and [3], it is emphasized that you must have the @typescript-eslint/eslint-plugin and @typescript-eslint/parser packages installed as follows:

npm install --save-dev eslint @typescript-eslint/parser @typescript-eslint/eslint-plugin

References:

[1] https://github.com/vuejs/eslint-config-typescript/issues/14

[2] ESLint - Configuring "no-unused-vars" for TypeScript

[3]

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