.eslintrc.js

module.exports = {
    env: {
        browser: true,
        es6: true,
    },
    extends: [
        'airbnb-base',
        'plugin:@typescript-eslint/recommended',
        'plugin:typescript-sort-keys/recommended',
    ],
    parser: '@typescript-eslint/parser',
    parserOptions: {
        ecmaVersion: 2019,
        extraFileExtensions: ['.svelte'],
        sourceType: 'module',
    },
    root: true,
    rules: {
        '@typescript-eslint/member-delimiter-style': ['error', {
            multiline: {
                delimiter: 'semi',
                requireLast: true,
            },
            singleline: {
                delimiter: 'semi',
                requireLast: true,
            },
        }],
        '@typescript-eslint/member-ordering': ['error', {
            default: {
                memberTypes: ['signature', 'static-field', 'field', 'static-method', 'constructor', 'method'],
                order: 'alphabetically',
            },
            interfaces: {
                memberTypes: ['constructor', 'signature', 'field', 'method'],
                order: 'alphabetically',
            },
            typeLiterals: {
                memberTypes: ['constructor', 'signature', 'field', 'method'],
                order: 'alphabetically',
            },
        }],
        '@typescript-eslint/no-shadow': 'error',
        '@typescript-eslint/no-unused-vars': [
            'error',
            { argsIgnorePattern: '^_' },
        ],
        '@typescript-eslint/no-useless-constructor': 'error',
        '@typescript-eslint/no-var-requires': 'off',
        'arrow-body-style': 'off',
        camelcase: 'warn',
        'class-methods-use-this': 'off',
        'comma-dangle': [
            'error',
            {
                arrays: 'always-multiline',
                functions: 'never',
                objects: 'always-multiline',
            },
        ],
        'function-paren-newline': ['error', 'multiline-arguments'],
        'import/extensions': 'off',
        'import/first': 'off',
        'import/no-extraneous-dependencies': 'off',
        'import/no-mutable-exports': 'off',
        'import/no-unresolved': 'off',
        'import/order': 'off',
        'import/prefer-default-export': 'off',
        indent: ['error', 4],
        'max-classes-per-file': 'off',
        'max-len': [
            'error',
            {
                code: 120,
                ignoreRegExpLiterals: true,
                ignoreStrings: true,
                ignoreTemplateLiterals: true,
                ignoreUrls: true,
            },
        ],
        'no-case-declarations': 'off',
        'no-console': 'off',
        'no-continue': 'off',
        'no-nested-ternary': 'off',
        'no-new': 'warn',
        'no-param-reassign': 'off',
        'no-plusplus': 'off',
        'no-shadow': 'off',
        'no-underscore-dangle': 'off',
        'no-unused-vars': 'off',
        'no-use-before-define': ['error', 'nofunc'],
        'no-useless-constructor': 'off',
        'object-curly-newline': ['error', { consistent: true }],
        'operator-linebreak': ['error', 'before', { overrides: { '=': 'after' } }],
        'sort-keys': ['error', 'asc', { caseSensitive: false, natural: true }],
    },
    settings: {
        'svelte3/ignore-styles': () => true,
        'svelte3/ignore-warnings': () => true,
        'svelte3/typescript': true,
    },
};