.eslintrc.js

const generalRules = {
  'no-var': 'off',
  'no-async-promise-executor': 'off',
  'no-case-declarations': 'off',
  'no-extra-boolean-cast': 'off',
  'no-undef': 'off', // Shouldn't need this, tsc takes care of it
};

// From the tslint.json we used previously
const leftoverTsLintRules = {
  '@typescript-eslint/no-explicit-any': 'off',
  '@typescript-eslint/explicit-function-return-type': 'off',
  '@typescript-eslint/no-use-before-define': 'off',
  '@typescript-eslint/ban-ts-ignore': 'off',
  '@typescript-eslint/no-non-null-assertion': 'off',
  // TODO: Get rid of this, there are just a small number of cases
  '@typescript-eslint/no-unused-vars': 'off',
  '@typescript-eslint/interface-name-prefix': 'off',
};

// Jest violations
const jestViolations = {
  'jest/valid-describe': 'off',
  'jest/no-focused-tests': 'off',
  'jest/no-export': 'off',
  'jest/no-identical-title': 'off',
  'jest/no-try-expect': 'off',
  'jest/no-disabled-tests': 'off',

  // For these two, the linter doesn't know we're using a helper function
  'jest/expect-expect': 'off',
  'jest/no-standalone-expect': 'off',
};

const importRules = {
  // Could not get this rule to work properly
  'import/no-unresolved': 'off',
  'import/no-duplicates': 'off',
  // NOTE: There is some error with eslint-plugin-import treating redux-saga/effects wrongly
  // https://github.com/benmosher/eslint-plugin-import/issues/793#issuecomment-314088164
  'import/named': 'off',
};

const reactRules = {
  'react/no-unescaped-entities': 'off',
  'react/prop-types': 'off', // We have Typescript
};

module.exports = {
  env: {
    browser: true,
    es6: true,
  },
  plugins: ['jest', 'react'],
  settings: {
    react: {
      version: 'detect',
    },
  },
  extends: [
    '../../.eslintrc.js',
    'plugin:jest/recommended',
    'plugin:jest/style',
    'plugin:react/recommended',
  ],
  rules: {
    ...generalRules,
    ...leftoverTsLintRules,
    ...importRules,
    ...jestViolations,
    ...reactRules,
  },
  overrides: [
    {
      files: ['**/*.js'],
      parser: 'babel-eslint',
      rules: {
        '@typescript-eslint/no-var-requires': 'off',
      },
      env: {
        node: true,
      },
    },
  ],
};