.eslintrc.js

module.exports = {
    root: true,
    parser: '@typescript-eslint/parser',
    plugins: ['@typescript-eslint', 'wdio'],
    extends: [
        'eslint:recommended',
        'plugin:wdio/recommended',
    ],
    env: {
        node: true,
        es6: true,
        jasmine: true,
    },
    globals: {
        browser: true,
        document: true,
    },
    parserOptions: {
        ecmaVersion: 2017,
        sourceType: 'module',
    },
    rules: {
        semi: ['error', 'always'],
        indent: [2, 4],

        'no-multiple-empty-lines': [ 2, { 'max': 1, 'maxEOF': 1 } ],
        'array-bracket-spacing': [ 'error', 'never' ],
        'brace-style': [ 'error', '1tbs', { allowSingleLine: true } ],
        camelcase: [ 'error', { properties: 'never' } ],
        'comma-spacing': [ 'error', { before: false, after: true } ],
        'no-lonely-if': 'error',
        'no-else-return': 'error',
        'no-tabs': 'error',
        'no-trailing-spaces': [ 'error', {
            skipBlankLines: false,
            ignoreComments: false,
        } ],
        quotes: [ 'error', 'single', { avoidEscape: true } ],
        'unicode-bom': [ 'error', 'never' ],
        'object-curly-spacing': [ 'error', 'always' ],
        'keyword-spacing': [ 'error' ],
        'require-atomic-updates': 0,
        'no-unexpected-multiline': 0,
    },
    overrides: [ {
        files: [ '*.ts' ],
        rules: {
            // see https://stackoverflow.com/questions/55280555/typescript-eslint-eslint-plugin-error-route-is-defined-but-never-used-no-un
            'no-unused-vars': 'off',
            '@typescript-eslint/no-unused-vars': 'error',
            'no-undef': 'off',
            // allow overloads
            'no-redeclare': 'off',
        },
    } ],
};