.eslintrc.js

module.exports = {
  root: true,
  env: {
    node: true,
    browser: true,
    jest: true,
  },
  extends: [
    'eslint:recommended',
  ],
  plugins: ['prettier'],

  parser: '@typescript-eslint/parser',
  overrides: [
    {
      files: ['*.ts'], // Your TypeScript files extension

      // As mentioned in the comments, you should extend TypeScript plugins here,
      // instead of extending them outside the `overrides`.
      // If you don't want to extend any rules, you don't need an `extends` attribute.
      extends: [
        'plugin:@typescript-eslint/recommended',
        'plugin:@typescript-eslint/recommended-requiring-type-checking',
      ],

      parserOptions: {
        sourceType: 'module',
        ecmaVersion: 2020,
        project: './tsconfig.json',
      },
      rules: {
        '@typescript-eslint/no-floating-promises': 'warn',
        '@typescript-eslint/no-unsafe-assignment': 'warn',
        '@typescript-eslint/no-unsafe-call': 'warn',
        '@typescript-eslint/no-unsafe-member-access': 'warn',
        '@typescript-eslint/no-unsafe-return': 'warn',
        '@typescript-eslint/restrict-template-expressions': [
          'warn',
          { 'allowNumber': true, 'allowNullish': true }],
      },
    },
  ],

  rules: {
    'prettier/prettier': ['error'],
    quotes: ['error', 'single', { allowTemplateLiterals: true }],
    semi: ['warn', 'always'],
    'no-console': 'off',
    'no-unused-vars': 'warn',
    'no-inner-declarations': 'warn',
    'no-useless-escape': 'warn',
    'no-debugger': 'warn',
  },
};