jest
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jest | ESLint | |
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473 | 379 | |
43,553 | 24,231 | |
0.5% | 1.0% | |
9.6 | 9.7 | |
6 days ago | 6 days ago | |
TypeScript | JavaScript | |
MIT License | MIT License |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
jest
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What is an Abstract Syntax Tree in Programming?
GitHub | Website
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Top 10 Tools Every React Developer Needs in 2024
Jest
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API Testing with Clerk and Express
you have selected a testing framework. In my case, it's Jest with Supertest
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JS Toolbox 2024: Bundlers and Test Frameworks
Jest, created and maintained by Facebook, is a JavaScript testing framework with a focus on simplicity. It is often recognized for its zero-configuration setup and seamless integration, especially with React applications, making it a favored choice for developers in both small-scale projects and large enterprise applications.
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Testing library for Node.js and React
Jest (https://jestjs.io/)
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Unit Testing Expo Apps With Jest
console.error Jest encountered an unexpected token Jest failed to parse a file. This happens e.g. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax. Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration. By default "node\_modules" folder is ignored by transformers. Here's what you can do: • If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/ecmascript-modules for how to enable it. • If you are trying to use TypeScript, see https://jestjs.io/docs/getting-started#using-typescript • To have some of your "node\_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config. • If you need a custom transformation specify a "transform" option in your config. • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option. You'll find more details and examples of these config options in the docs: https://jestjs.io/docs/configuration For information about custom transformations, see: https://jestjs.io/docs/code-transformation
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Easily create mock data for unit tests 🧪
Note: I will be using Jest as testing framework throughout the examples.
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Painless CLI integration testing
We use Jest Framework for testing. Jest is not a dogma, and, of course, in its place can be any other test runner, such as Mocha or Ava. Let's focus on tests. I'll provide a short example because I don’t want to waste your time. You can find the full version here. It's crucial to read the comments in the code below. Let's go!
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What is integration testing in UI/Front End?
Jest has long been my favorite got to test runner when it comes to UI unit and integration testing. With tools like React Testing Library (Testing Library framework for React) you get the benefit of very easy to write and maintain tests, as well as a quick and efficient way to run our tests.
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13 best React debugging tools
Jest is a well-regarded JavaScript testing framework primarily designed for React applications, although its utility extends to projects using Babel, JavaScript, Node, Angular, and Vue. Created by Facebook, Jest emphasizes ensuring the correctness of JavaScript codebases. It allows developers to write tests with a familiar, feature-rich API, making the testing process swift and enjoyable.
ESLint
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To Review or Not to Review: The Debate on Mandatory Code Reviews
Automating code checks with static code analysis allows us to enforce code styling effectively. By integrating tools into our workflow, we can identify errors at an early stage, while coding instead of blocking us at the end. For instance, flake8 checks Python code for style and errors, eslint performs similar checks for JavaScript, and prettier automatically formats code to maintain consistency.
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Biome.js : Prettier+ESLint killer ?
If you're a developer, you're surely familiar with Prettier and ESLint. With over 8 years of existence, they have established themselves as references in the JavaScript ecosystem.
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Most basic code formatting
eslint is used to avoid code errors
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How to use Lefthooks in your node project?
No lint errors: The committed code does not contain any lint errors (eslint).
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Git Project Configuration With Husky and ESLint
Let’s walk through the steps for a one-time setup to configure husky pre-commit and pre-push hooks, ESLint with code styles conventions, prettier code formatter, and lint-staged. Husky automatically runs a script on each commit or push. This is useful for linting files to enforce code styles that keeps the entire code base following conventions.
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What is an Abstract Syntax Tree in Programming?
GitHub | Website
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Shared Tailwind Setup For Micro Frontend Application with Nx Workspace
ESLint: A pluggable and configurable linter tool for identifying and reporting on patterns in JavaScript.
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6 Tools To Help Keep Your Dependencies And Code More Secure
ESLint
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Six Factors That Raise The Risk Of Bugs In A Codebase
1. Lack of Static Code Analysis Static code analysis tools like TypeScript and ESLint play a crucial role in identifying and preventing bugs. TypeScript provides static typing, enhancing the robustness of the code. ESLint detects issues and enforces coding standards. The absence of these tools can significantly elevate the likelihood of bugs due to the lack of early detection and guidance provided during development.
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Linting
The industry standard for JavaScript is ESLint. VS Code has an ESLint extension. Here is a guide.
What are some alternatives?
tap - Test Anything Protocol tools for node
XO - ❤️ JavaScript/TypeScript linter (ESLint wrapper) with great defaults
vitest - Next generation testing framework powered by Vite.
Standard - 🌟 JavaScript Style Guide, with linter & automatic code fixer
Cucumber.js - Cucumber for JavaScript
prettier - Prettier is an opinionated code formatter.
Sinon.JS - Test spies, stubs and mocks for JavaScript.
JSHint - JSHint is a tool that helps to detect errors and potential problems in your JavaScript code
nyc - the Istanbul command line interface
JSLint - JSLint, The JavaScript Code Quality and Coverage Tool
WebdriverIO - Next-gen browser and mobile automation test framework for Node.js
Babel (Formerly 6to5) - 🐠 Babel is a compiler for writing next generation JavaScript.