const path = require('path');

module.exports = {
  parser: '@typescript-eslint/parser',
  extends: [
    'airbnb-base',
    'plugin:import/errors',
    'plugin:import/warnings',
    'plugin:import/typescript',
  ],
  root: true,
  env: {
    browser: true,
  },
  rules: {
    'import/no-extraneous-dependencies': 0,
    'import/extensions': ['error', 'always', {
      ts: 'never',
      js: 'never',
    }],
    'prefer-destructuring': ['error', {
      object: true,
      // Because Babel transformation bloats bundle size.
      array: false,
    }],
    // Because Babel transformation bloats bundle size.
    'prefer-object-spread': ['off'],
    // Because we use Babel transformer to remove them.
    'no-console': ['off'],
  },
  overrides: [{
    files: ['*.ts'],
    parserOptions: {
      project: path.resolve(__dirname, './tsconfig-eslint.json'),
      sourceType: 'module',
    },
    extends: [
      'plugin:@typescript-eslint/eslint-recommended',
      'plugin:@typescript-eslint/recommended',
      'plugin:@typescript-eslint/recommended-requiring-type-checking',
    ],
    plugins: [
      '@typescript-eslint',
    ],
    rules: {
      '@typescript-eslint/prefer-includes': ['off'],
      '@typescript-eslint/explicit-function-return-type': ['error', {
        allowExpressions: true,
        allowHigherOrderFunctions: true,
      }],
    },
  }, {
    files: [
      'src/**/__tests__/*.ts',
      'src/**/__mocks__/*.ts',
    ],
    env: {
      jest: true,
    },
    extends: [
      'plugin:jest/recommended',
      'plugin:jest/style',
    ],
  }],
};