@nrwl/jest

What is @nrwl/jest?

The @nrwl/jest package is part of the Nx suite of tools, designed to enhance the development experience with Jest in a monorepo setup. It provides seamless integration of Jest into Nx workspaces, enabling efficient unit testing configurations, execution, and optimizations tailored for projects managed within an Nx workspace.

What are @nrwl/jest's main functionalities?

Simplified Jest Configuration

Allows for simplified and centralized Jest configuration within an Nx workspace, making it easier to manage and share configurations across multiple library and application projects.

{
  "jestConfig": "./jest.config.js",
  "tsConfig": "./tsconfig.spec.json",
  "setupFile": "./src/test-setup.ts"
}

Parallel Test Execution

Enables parallel execution of tests across multiple projects within the workspace, significantly reducing the total time required for running tests in large projects.

nx run-many --target=test --all --parallel

Test Affected Projects

Identifies and runs tests only for the projects affected by recent changes, improving efficiency in continuous integration pipelines by skipping tests for unchanged projects.

nx affected:test

Other packages similar to @nrwl/jest

jest

Jest is the underlying testing framework that @nrwl/jest configures and enhances for use within Nx workspaces. While Jest can be used independently for testing JavaScript and TypeScript projects, @nrwl/jest provides additional integrations and optimizations for monorepo setups.

mocha

Mocha is another popular JavaScript test framework that can be used for unit and integration testing. Unlike @nrwl/jest, which is tailored for Jest and Nx workspaces, Mocha offers a more general-purpose testing solution without specific optimizations for monorepos or Nx.

karma

Karma is a test runner developed by the AngularJS team, designed to work with any framework. It differs from @nrwl/jest by focusing on executing tests in real browsers, providing a more integrated environment for testing browser-specific features. However, it lacks the monorepo-specific enhancements provided by @nrwl/jest.

README

@nrwl/jest has been renamed to @nx/jest!

@nrwl/jest has been renamed to @nx/jest. Please use that instead.

Read more here

@nrwl/jest will no longer be published in the future.

Nx: Smart Monorepos · Fast CI

Nx is a build system, optimized for monorepos, with plugins for popular frameworks and tools and advanced CI capabilities including caching and distribution.