SeekingAlpha Tests ESLint Config

4.60.0 verified Sat Apr 25 auth: no javascript

SeekingAlpha's shareable ESLint configuration for testing environments using ESLint 9.39.2, eslint-plugin-jest 29.15.2, and eslint-plugin-testing-library 7.16.2. This config is designed for ES6+ codebases and is distributed under MIT license. It requires Node.js >= 24 and uses the flat config format (eslint.config.js) introduced in ESLint 9. The package enforces Jest and Testing Library best practices for unit and integration tests. It is part of SeekingAlpha's JavaScript monorepo and follows their internal coding standards.

Common errors

error Error: Cannot find module 'eslint-config-seekingalpha-tests' ↓

cause Package not installed or not in node_modules.

fix

Run 'npm install eslint-config-seekingalpha-tests@latest --save-dev'

error Error [ERR_REQUIRE_ESM]: require() of ES Module not supported ↓

cause Using CommonJS require() to load an ESM-only package.

fix

Use import statement in an ESM context (e.g., set 'type': 'module' in package.json or rename file to .mjs).

error Oops! Something went wrong! :( ESLint: 9.39.2. Configuration for rule 'jest/consistent-test-it' is invalid: Value "test" does not match any valid value. ↓

cause Incompatible version of eslint-plugin-jest or missing peer dependency.

fix

Ensure eslint-plugin-jest@29.15.2 is installed exactly.

error ESLint couldn't find the config 'eslint-config-seekingalpha-tests' in extended configs. You can remove this config from the extends list. ↓

cause Using the legacy 'extends' field in .eslintrc.* with a flat config package.

fix

Use flat config eslint.config.js and import the module as shown in quickstart.

Warnings

breaking ESLint 9 flat config only; does not support .eslintrc.* formats. Using legacy config results in 'Configuration for rule "..." is invalid' or ESLint failing to load config. ↓

fix Migrate to eslint.config.js flat config format. See ESLint documentation.

breaking Requires Node.js >= 24. Older Node versions cause 'ERR_REQUIRE_ESM' or syntax errors. ↓

fix Upgrade Node.js to 24 or later.

gotcha The default export is an object with 'plugins' and 'rules' keys, not an array. Using it directly as a config array element may cause 'Config (element) is not an array' error. ↓

fix Wrap in an array as shown in the quickstart example, or spread plugins and rules into a new config object.

gotcha Peer dependencies must be installed at exact versions specified ('eslint@9.39.2', 'eslint-plugin-jest@29.15.2', 'eslint-plugin-testing-library@7.16.2'). Mismatched versions may cause rule conflicts or missing plugins. ↓

fix Install with exact versions: npm install eslint@9.39.2 eslint-plugin-jest@29.15.2 eslint-plugin-testing-library@7.16.2 --save-dev

deprecated Package is internal to SeekingAlpha; no longer maintained for public use. Issues and PRs may not be addressed. ↓

fix Consider creating your own ESLint config or using community alternatives like eslint-config-jest.

Install

npm install eslint-config-seekingalpha-tests

yarn add eslint-config-seekingalpha-tests

pnpm add eslint-config-seekingalpha-tests

Imports

default (testsConfig)
wrong
```
const testsConfig = require('eslint-config-seekingalpha-tests');
```
correct
```
import testsConfig from 'eslint-config-seekingalpha-tests';
```
Package is ESM-only. Requires Node >= 24 and 'type': 'module' in package.json or use .mjs extension.
plugins
wrong
```
const { plugins } = require('eslint-config-seekingalpha-tests');
```
correct
```
const { plugins } = testsConfig;
```
Import the default export and destructure plugins and rules. Do not require() as it will throw.
rules
```
const { rules } = testsConfig;
```
Access rules object from the default export. This is the recommended pattern in the README.

Quickstart

Shows how to use the shareable config in eslint.config.js by importing the default export and spreading its plugins and rules.

import testsConfig from 'eslint-config-seekingalpha-tests';

export default [
  {
    plugins: {
      ...testsConfig.plugins,
    },
    rules: {
      ...testsConfig.rules,
    },
  },
];