.eslintrc.js

module.exports = {
    root: true, // Don't look outside this project for inherited configs
    parser: '@typescript-eslint/parser', // Specifies the ESLint parser
    parserOptions: {
        ecmaVersion: 2018, // Allows for the parsing of modern ECMAScript features
        sourceType: 'module', // Allows for the use of imports
        project: './tsconfig.json',
        ecmaFeatures: {
            jsx: true,
        },
    },
    extends: [
        'plugin:@typescript-eslint/recommended', // Uses the recommended rules from the @typescript-eslint/eslint-plugin
        'plugin:react/recommended', // Supports React JSX
    ],
    plugins: ['react'],
    settings: {
        react: {
            version: 'detect',
        },
    },
    rules: {
        'indent': 'off',
        '@typescript-eslint/indent': [
            'error',
            4,
            {
                'SwitchCase': 1
            }
        ],
        'quotes': [
            'error',
            'single',
            {
                'avoidEscape': true,
                'allowTemplateLiterals': true
            }
        ],
        '@typescript-eslint/no-parameter-properties': 'off',
        '@typescript-eslint/no-explicit-any': 'off',
        '@typescript-eslint/no-use-before-define': [
            'error',
            {
                functions: false,
                typedefs: false,
                classes: false,
            },
        ],
        '@typescript-eslint/no-unused-vars': [
            'error',
            {
                ignoreRestSiblings: true,
                argsIgnorePattern: '^_',
            },
        ],
        '@typescript-eslint/explicit-function-return-type': [
            'warn',
            {
                allowExpressions: true,
                allowTypedFunctionExpressions: true,
            },
        ],
        '@typescript-eslint/no-object-literal-type-assertion': 'off',
        '@typescript-eslint/interface-name-prefix': 'off',
        '@typescript-eslint/no-non-null-assertion': 'off', // This is necessary for Map.has()/get()!
        'no-var': 'error',
        'prefer-const': 'error',
        'no-trailing-spaces': 'error',
    },
    overrides: [
        {
            files: ['*.test.ts', '*.tsx'],
            rules: {
                '@typescript-eslint/explicit-function-return-type': 'off',
            },
        },
    ],
};