.eslintrc.js

module.exports = {
  parser: '@typescript-eslint/parser',
  parserOptions: {
    project: 'tsconfig.json',
    sourceType: 'module',
    extraFileExtensions: ['.json'],
  },
  plugins: ['@typescript-eslint/eslint-plugin'],
  extends: [
    'plugin:@typescript-eslint/recommended',
    'plugin:@typescript-eslint/recommended-requiring-type-checking',
    'plugin:prettier/recommended',
  ],
  root: true,
  env: {
    node: true,
    jest: true,
  },
  rules: {
    '@typescript-eslint/require-await': 'warn',
    '@typescript-eslint/unbound-method': 'warn',
    '@typescript-eslint/no-unsafe-assignment': 'warn',
    '@typescript-eslint/no-unsafe-return': 'warn',
    '@typescript-eslint/no-unsafe-argument': 'warn',
    '@typescript-eslint/no-unsafe-member-access': 'warn',
    '@typescript-eslint/no-unsafe-call': 'warn',
    '@typescript-eslint/no-floating-promises': 'warn',
    '@typescript-eslint/restrict-template-expressions': 'warn',
    '@typescript-eslint/no-misused-promises': ['error', {
      checksVoidReturn: false,
    }],
    '@typescript-eslint/interface-name-prefix': 'off',
    '@typescript-eslint/explicit-function-return-type': 'off',
    '@typescript-eslint/explicit-module-boundary-types': 'off',
    '@typescript-eslint/no-explicit-any': 'off',
    '@typescript-eslint/no-inferrable-types': 'off',
    '@typescript-eslint/ban-types': [
      'error',
      {
        types: {
          String: {
            message: 'Use string instead',
            fixWith: 'string',
          },
          Boolean: {
            message: 'Use boolean instead',
            fixWith: 'boolean',
          },
          Number: {
            message: 'Use number instead',
            fixWith: 'number',
          },
          Symbol: {
            message: 'Use symbol instead',
            fixWith: 'symbol',
          },

          Function: {
            message: [
              'The `Function` type accepts any function-like value.',
              'It provides no type safety when calling the function, which can be a common source of bugs.',
              'It also accepts things like class declarations, which will throw at runtime as they will not be called with `new`.',
              'If you are expecting the function to accept certain arguments, you should explicitly define the function shape.',
            ].join('\n'),
          },

          // object typing
          Object: {
            message: [
              'The `Object` type actually means "any non-nullish value", so it is marginally better than `unknown`.',
              '- If you want a type meaning "any object", you probably want `Record<string, unknown>` instead.',
              '- If you want a type meaning "any value", you probably want `unknown` instead.',
            ].join('\n'),
          },
          '{}': {
            message: [
              '`{}` actually means "any non-nullish value".',
              '- If you want a type meaning "any object", you probably want `Record<string, unknown>` instead.',
              '- If you want a type meaning "any value", you probably want `unknown` instead.',
            ].join('\n'),
          },
          object: false,
        },
      },
    ],
  },
};