@nrwl/jest
Advanced tools
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.
🔎 Nx is a set of Angular CLI power-ups for modern development.
Using Nx, you can add Cypress, Jest, Prettier, and Nest into your dev workflow. Nx sets up these tools and allows you to use them seamlessly. Nx fully integrates with the other modern tools you already use and love.
With Nx, you can build full-stack applications using Angular and Node.js frameworks such as Nest and Express. You can share code between the frontend and the backend. And you can use the familiar ng build/test/serve commands to power whole dev experience.
With Nx, you can develop multiple full-stack applications holistically and share code between them all in the same workspace. Nx provides advanced tools which help you scale your enterprise development. Nx helps enforce your organization’s standards and community best practices.
Most importantly, you can use these power-ups a la carte. Just want to build a single Angular application using Cypress? Nx is still an excellent choice for that.
Nx is not a replacement for Angular CLI. An Nx workspace is an Angular CLI workspace.
ng build, ng serve commands.angular.json.Using npx
npx create-nx-workspace myworkspace
Using npm init
npm init nx-workspace myworkspace
Using yarn create
yarn create nx-workspace myworkspace
If you already have a regular Angular CLI project, you can add Nx power-ups by running:
ng add @nrwl/schematics
Unlike the CLI, an Nx workspace starts blank. There are no applications to build, serve, and test. To create one run:
ng g application myapp
The result will look like this:
<workspace name>/
├── README.md
├── angular.json
├── apps/
│ ├── myapp/
│ │ ├── browserslist
│ │ ├── jest.conf.js
│ │ ├── src/
│ │ │ ├── app/
│ │ │ ├── assets/
│ │ │ ├── environments/
│ │ │ ├── favicon.ico
│ │ │ ├── index.html
│ │ │ ├── main.ts
│ │ │ ├── polyfills.ts
│ │ │ ├── styles.scss
│ │ │ └── test.ts
│ │ ├── tsconfig.app.json
│ │ ├── tsconfig.json
│ │ ├── tsconfig.spec.json
│ │ └── tslint.json
│ └── myapp-e2e/
│ ├── cypress.json
│ ├── src/
│ │ ├── fixtures/
│ │ │ └── example.json
│ │ ├── integration/
│ │ │ └── app.spec.ts
│ │ ├── plugins/
│ │ │ └── index.ts
│ │ └── support/
│ │ ├── app.po.ts
│ │ ├── commands.ts
│ │ └── index.ts
│ ├── tsconfig.e2e.json
│ ├── tsconfig.json
│ └── tslint.json
├── libs/
├── nx.json
├── package.json
├── tools/
├── tsconfig.json
└── tslint.json
All the files that the CLI would have in a new project are still here, just in a different folder structure which makes it easier to create more applications and libraries in the future.
Run ng serve myapp to serve the newly generated application!
You are good to go!
If you want to file a bug or submit a PR, read up on our guidelines for contributing.
| Victor Savkin | Jason Jean | Benjamin Cabanes |
|---|---|---|
 |  |  |
| vsavkin | FrozenPandaz | bcabanes |
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 1,008,787 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. It has 7 open source maintainers collaborating on the project.
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