// https://eslint.org/docs/user-guide/configuring
const path = require('path');
module.exports = {
 root: true,
 parserOptions: {
 parser: '@babel/eslint-parser',
 ecmaVersion: 2020,
 requireConfigFile: false,
 babelOptions:
 {
 configFile: path.resolve(__dirname, './babel.config.js')
 }
 },
 env:
 {
 browser: true,
 node: true,
 },
 extends: [
 // https://github.com/vuejs/eslint-plugin-vue#priority-a-essential-error-prevention
 // consider switching to `plugin:vue/strongly-recommended` or `plugin:vue/recommended` for stricter rules.
 'plugin:vue/recommended',
 // https://github.com/standard/standard/blob/master/docs/RULES-en.md
 '@vue/eslint-config-standard',
 ],
 // add your custom rules here
 rules: {
 // allow async-await
 'generator-star-spacing': 'off',
 semi: ['error', 'always'],
 'brace-style': ['error', 'allman'],
 'space-before-function-paren': ['error', {
 anonymous: 'never',
 named: 'never',
 asyncArrow: 'always'
 }],
 'object-curly-newline': [
 'error',
 {
 ObjectExpression: {
 multiline: true,
 minProperties: 2,
 consistent: true
 },
 ObjectPattern: { multiline: true },
 ImportDeclaration: { multiline: true },
 ExportDeclaration: {
 multiline: true,
 minProperties: 3
 }
 }
 ],
 'object-property-newline': [
 'error',
 { allowAllPropertiesOnSameLine: false }
 ],
 'comma-dangle': [
 'error',
 {
 arrays: 'only-multiline',
 objects: 'only-multiline',
 imports: 'never',
 exports: 'never',
 functions: 'never'
 }
 ],
 quotes: [
 'error',
 'single',
 {
 avoidEscape: true,
 allowTemplateLiterals: true
 }
 ],
 'one-var': [
 'error',
 {
 uninitialized: 'always',
 initialized: 'never'
 }
 ],
 'block-scoped-var': "error",
 'default-param-last': ["error"],
 'func-names': ["error", "as-needed"],
 'func-style': ["error", "declaration", { "allowArrowFunctions": true }],
 'max-statements-per-line': ["error", { "max": 1 }],
 'no-confusing-arrow': "error",
 'no-constant-binary-expression': "error",
 'no-dupe-else-if': "error",
 'no-lonely-if': "error",
 'no-loop-func': "error",
 'nonblock-statement-body-position': ["error", "beside"],
 'no-negated-in-lhs': "error",
 'no-shadow': "error",
 'no-spaced-func': "error",
 'no-unsafe-optional-chaining': ["error", { "disallowArithmeticOperators": true }],
 'no-useless-concat': "error",
 'semi-style': ["error", "last"],
 'vars-on-top': "error",
 'vue/no-undef-properties': 'error',
 }
}

import Vue from 'vue';
import App from './App.vue';
import store from './store/store';
import { mapGetters, mapMutations } from 'vuex';
new Vue({
 name: 'RootVue',
 computed:
 {
 ...mapGetters(['getCountryMap']),
 },
 watch:
 {
 getCountryMap()
 {
 this.updatePrefix();
 },
 },
 created()
 {
 this.setCountries([]);
 },
 methods:
 {
 ...mapMutations(['setCountries']),
 updatePrefix()
 {
 //
 },
 },
 store,
 render: h => h(App)
}).$mount('#app');

You may use special comments to disable some warnings.
Use // eslint-disable-next-line to ignore the next line.
Use /* eslint-disable */ to ignore all warnings in a file.
ERROR in [eslint]
Z:\_\src\main.js
 14:5 error 'getCountryMap' is not defined vue/no-undef-properties
 21:10 error 'setCountries' is not defined vue/no-undef-properties
✖ 2 problems (2 errors, 0 warnings)
webpack compiled with 1 error