@nrwl/jest
Advanced tools
Package description
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.
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 --parallelTest 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:testJest 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 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 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
š Smart, Extensible Build Framework
Nx is a smart and extensible build framework to help you architect, test, and build at any scale ā integrating seamlessly with modern technologies and frameworks while providing a distributed graph-based task execution, computation caching, smart rebuilds of affected projects, powerful code generators, editor support, GitHub apps, and more.
Nx provides distributed graph-based task execution and computation caching.
Nx is smart. It analyzes your workspace and figures out what can be affected by every code change. That's why Nx doesn't rebuild and retest everything on every commit--it only rebuilds what is necessary .
Nx partitions commands into a graph of smaller tasks. Nx then runs those tasks in parallel, and it can even distribute them across multiple machines without any configuration.
Nx also uses a distributed computation cache. If someone has already built or tested similar code, Nx will use their results to speed up the command for everyone else.
Nx helps scale your development from one team building one application to many teams building multiple frontend and backend applications all in the same workspace. When using Nx, developers have a holistic dev experience powered by an advanced CLI (with editor plugins), capabilities for controlled code sharing and consistent code generation.
Nx is an open platform with plugins for many modern tools and frameworks. It has support for TypeScript, React, Angular, Cypress, Jest, Prettier, Nest.js, Next.js, Storybook, Ionic among others. With Nx, you get a consistent dev experience regardless of the tools used.
Executors and generators adding Jest tests to applications and libraries.
This package is used by the @nrwl/web, @nrwl/react, @nrwl/angular, @nrwl/node. See https://github.com/nrwl/nx for more information.
Even though Nx isn't technology specific, we provide 3 separate flavours of the documentation site to it make it easier for you to get up and running. For every link below, you will be able to select whether you want your examples to be written in React, Node or Angular.
| Scale React Development with Nx | Nx Workspaces | Advanced Nx Workspaces |
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FAQs
The Nx Plugin for Jest contains executors and generators allowing your workspace to use the powerful Jest testing capabilities.
The npm package @nrwl/jest receives a total of 1,214,711 weekly downloads. As such, @nrwl/jest popularity was classified as popular.
We found that @nrwl/jest demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago.Ā It has 7 open source maintainers collaborating on the project.
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