.eslintrc.js

// TODO: Can we publish a @bugsnag/eslint-plugin-typescript package to share all of this?
const tsRuleOverrides = {
  // Let TypeScript inference work without being verbose
  '@typescript-eslint/explicit-function-return-type': 'off',

  // (Explicit) any has its valid use cases
  '@typescript-eslint/no-explicit-any': 'off',

  // We use noop functions liberally (() => {})
  '@typescript-eslint/no-empty-function': 'off',

  // This incorrectly fails on TypeScript method override signatures
  'no-dupe-class-members': 'off',

  // Disable all rules that require parserServices (for now)
  '@typescript-eslint/no-floating-promises': 'off',
  '@typescript-eslint/no-misused-promises': 'off',
  '@typescript-eslint/no-unnecessary-type-assertion': 'off',
  '@typescript-eslint/prefer-nullish-coalescing': 'off',
  '@typescript-eslint/prefer-readonly': 'off',
  '@typescript-eslint/promise-function-async': 'off',
  '@typescript-eslint/require-array-sort-compare': 'off',
  '@typescript-eslint/require-await': 'off',
  '@typescript-eslint/restrict-plus-operands': 'off',
  '@typescript-eslint/restrict-template-expressions': 'off',
  '@typescript-eslint/strict-boolean-expressions': 'off',
  '@typescript-eslint/no-throw-literal': 'off',
  '@typescript-eslint/no-implied-eval': 'off',
  '@typescript-eslint/no-unnecessary-boolean-literal-compare': 'off',
  '@typescript-eslint/prefer-includes': 'off',
  '@typescript-eslint/no-for-in-array': 'off',

  // Optional chaining compiles to a lot more code
  '@typescript-eslint/prefer-optional-chain': 'off',

  // Support TypeScript 3.8 by disallowing import { type Module } from 'module'
  // TODO: Find the export equivalent
  'import/consistent-type-specifier-style': ['warn', 'prefer-top-level']
}

const jestRuleOverrides = {
  // Disable preferring Promise-based async tests
  'jest/no-test-callback': 'off'
}

module.exports = {
  root: true,
  reportUnusedDisableDirectives: true,
  parser: '@typescript-eslint/parser',
  parserOptions: {
    ecmaVersion: 'latest',
    sourceType: 'module'
  },
  overrides: [
    // linting for js files
    {
      files: ['**/*.js'],
      extends: ['standard']
    },
    {
      files: ['**/*.test.js'],
      extends: ['standard'],
      plugins: ['eslint-plugin-jest'],
      rules: { ...jestRuleOverrides },
      env: { jest: true }
    },
    // linting for ts files
    {
      files: ['**/*.ts?(x)'],
      extends: ['standard-with-typescript'],
      rules: { ...tsRuleOverrides },
      parserOptions: {
        project: 'tsconfig.json'
      }
    },
    {
      files: ['packages/platforms/browser/**/*.ts'],
      plugins: ['compat'],
      extends: ['standard-with-typescript', 'plugin:compat/recommended'],
      env: { browser: true },
      rules: { ...tsRuleOverrides },
      parserOptions: {
        project: 'tsconfig.json'
      }
    },
    {
      files: [
        '**/*.test.ts?(x)'
      ],
      env: {
        jest: true,
        browser: true
      },
      plugins: ['eslint-plugin-jest'],
      extends: [
        'standard-with-typescript',
        'plugin:jest/recommended'
      ],
      rules: {
        ...tsRuleOverrides,
        ...jestRuleOverrides
      },
      parserOptions: {
        project: './tsconfig.json'
      }
    }
  ]
}