proposal-shadowrealm
ECMAScript Proposal, specs, and reference implementation for Realms (by tc39)
jest
Delightful JavaScript Testing. (by jestjs)
proposal-shadowrealm | jest | |
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19 | 474 | |
1,376 | 43,581 | |
1.2% | 0.3% | |
6.0 | 9.5 | |
12 days ago | 6 days ago | |
HTML | TypeScript | |
- | MIT License |
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
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.
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.
proposal-shadowrealm
Posts with mentions or reviews of proposal-shadowrealm.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2023-09-29.
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Updates from the 98th TC39 meeting
ShadowRealm: ECMAScript Proposal, specs, and reference implementation for Realms [Stage 3 -> 2].
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Should you use jest as a testing library?
You can't out of the box. There is an open issue on the Node.js repositoryto let the node:vm module to use the vm's context, but it is still open. It seems that the Node.js core team is interested in fixing this problem by implementing the new ShadowRealm spec, and I think we will make some progress during 2023.
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Building an Extension System on the Web
ShadowRealms — a successor of the Realms proposals, this API is intended for use cases exactly like plugins or extension systems, providing an option for creating distinct global environments to run the code in. While not entirely secure on its own, this API could provide a strong foundation to build actual extension systems on the Web. That said, 4 years later, the TC39 proposal is currently only at stage 3, not implemented by any browser;
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Vitest vs Jest benchmarks on a 5 year old real work SPA
With --no-isolate it was 2.8x faster than vitest and 1.7x faster than Jest, but 19 tests failed (see table above). Some people report issues with watch mode when using --no-isolate. So I decided to not pursue it any further. Once the vm module that Vitest relies on supports ESM, or when the amazingly named Shadow Realms are added to JavaScript, we will likely get this performance boost for free without the downsides.
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Improving Vitest Performance
If ShadowRealms are ever added to EcmaScript (and implemented into V8/Node) they'll allow for a different approach to isolating code that would be faster without the downsides of sharing global.
- Virtualization is not an important enough use case for the web platform to tradeoff ergonomics and possible confusion for web devs, who by and large […] do not understand the separation between the specs. More to the point, they really shouldn't need to.
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Is there an npm package for perchance?
Eventually I will get around to creating a "proper" package by just grabbing all the JS that is loaded by the code in the iframe, and bundling it up. We really need the ShadowRealm proposal to go through because the perchance engine messes with a lot of JS internals, so it would mess up the rest of your app. Could do it in a WebWorker, but then everything would have to be async.
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Show HN: Run unsafe user generated JavaScript in the browser
The upcoming JavaScript Shadow Realms proposal looks like it solves a similar problem: https://github.com/tc39/proposal-shadowrealm/blob/main/expla...
- Named Element IDs Can Be Referenced as JavaScript Globals
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Running user code in the browser (for a leetcode clone)
Browser-based JavaScript doesn't yet have a way to isolate code fully in this manner though there is a new JavaScript feature on the way that would provide this capability. Its called ShadowRealm and would basically give you a new global context to execute code that's completely separate from your main document code.
jest
Posts with mentions or reviews of jest.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2024-05-01.
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How to Add Firebase Authentication To Your NodeJS App
There are several testing approaches you can take to ascertain the functionality of the auth API. One way would be to automate the testing using unit tests with tools like Jest and Supertest. Alternatively, you can make use of API clients like Postman or the Thunder Client VS Code extension to test the API.
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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.
What are some alternatives?
When comparing proposal-shadowrealm and jest you can also consider the following projects:
wtfjs - 🤪 A list of funny and tricky JavaScript examples
tap - Test Anything Protocol tools for node
Pentive - Collaborative Spaced Repetition
vitest - Next generation testing framework powered by Vite.
vm2-process - Execute unsafe javascript code in a sandbox
Cucumber.js - Cucumber for JavaScript
vrite - Open-source developer content platform
Sinon.JS - Test spies, stubs and mocks for JavaScript.
caja - Caja is a tool for safely embedding third party HTML, CSS and JavaScript in your website.
nyc - the Istanbul command line interface
LavaMoat - tools for sandboxing your dependency graph
WebdriverIO - Next-gen browser and mobile automation test framework for Node.js