.eslintrc.js

module.exports = {
    root: true,
    parser: '@typescript-eslint/parser',
    parserOptions: {
        ecmaVersion: 2020,
        sourceType: 'module',
        ecmaFeatures: {
            jsx: true,
        },
    },
    extends: [
        'airbnb-base',
        'eslint:recommended',
        'plugin:@typescript-eslint/recommended',
        'plugin:@typescript-eslint/eslint-recommended',
        'prettier',
        'plugin:prettier/recommended',
    ],
    plugins: ['@typescript-eslint'],
    rules: {
        '@typescript-eslint/explicit-function-return-type': 'off',
        '@typescript-eslint/no-use-before-define': 'off',
        'jest/no-disabled-tests': 'off',
        '@typescript-eslint/camelcase': 0,
        '@typescript-eslint/no-var-requires': 0,
        'no-shadow': 'off',
        '@typescript-eslint/no-shadow': ['error'],
        '@typescript-eslint/no-non-null-assertion': 0,
        '@typescript-eslint/no-namespace': 'off',
        camelcase: 'off',
        'import/extensions': 'off',
        'import/no-extraneous-dependencies': 'off',
        'no-use-before-define': 'off',
        'prefer-template': 'off',
        'default-case': 'off',
        'lines-between-class-members': 'off',
        'class-methods-use-this': 'off',
    },
    overrides: [
        {
            // enable the rule specifically for TypeScript files
            files: ['*.ts', '*.tsx', '.js', '.jsx'],
            rules: {
                '@typescript-eslint/explicit-function-return-type': ['error'],
            },
        },
    ],
    env: {
        browser: true,
        node: true,
        es6: true,
    },
    settings: {
        'import/resolver': {
            node: {
                extensions: ['.js', '.ts'],
            },
        },
    },
}