jestjs/jest on Hacker News

…There is also a feature request to include parts of in in jest itself: https://github.com/jestjs/jest/issues/15953 Happy to answer questions about flaky Jest tests or async leak detection.

comment by Stephan_Dum · 2026-02-05 · in Show HN: Jest-doctor – catching async leaks that cause flaky Jest tests

…https://github.com/webpack-contrib/terser-webpack-plugin https://github.com/jridgewell/sourcemaps https://github.com/jestjs/jest https://github.com/yahoo/serialize-javascript https://github.com/browserify/randombytes…

comment by CMay · 2025-09-20 · in Less is safer: Reducing the risk of supply chain attacks

…it, this isn't all Jest's fault. Node is just now releasing fixes for [significant memory leaks]( https://github.com/jestjs/jest/issues/11956#issuecomment-180... ) around ESM support within the [VM APIs]( https://nodejs.org/api/vm.html )…

comment by joshkel · 2023-11-21 · in A Node, TypeScript, TS-Node and ESM experience that works

…chosen. Inside that and because workerThreads is set to false, we instantiate a child process here https://github.com/jestjs/jest/blob/00ef0ed0a03764f24ff568bc...

comment by mhagemeister · 2023-10-09 · in Speeding up the JavaScript ecosystem – The barrel file debacle

…test file is executed in its own child process. Is that confirmed? I've been following this issue: https://github.com/jestjs/jest/issues/6957 And what Jest actually does is still kind of muddy. In contrast to that, other test runners like…

comment by Tade0 · 2023-10-09 · in Speeding up the JavaScript ecosystem – The barrel file debacle

…of us that already have a mountain of Jest tests with mocks that aren't supported in ESM mode? https://github.com/jestjs/jest/issues/9430 I've definitely worked around my fair share of CommonJS issues but until ESM "just works" I'm…

comment by striking · 2023-06-30 · in CommonJS is hurting JavaScript

…waiting for everyone to figure out workarounds for theirs shitty implementation. [jest ESM support] https://github.com/jestjs/jest/issues/9430 [typescript extensions] https://github.com/microsoft/TypeScript/issues/16577 [typescript…

comment by Chyzwar · 2023-05-31 · in ES modules: A cartoon deep-dive (2018)

…[2] https://www.typescriptlang.org/docs/handbook/release-notes/typescript-4-7.html [3] https://github.com/facebook/jest/issues/9430

comment by Chyzwar · 2022-11-02 · in PR that converts the TypeScript repo from namespaces to modules

…https://news.ycombinator.com/item?id=30168241 ..and the comment from the "only" remaining maintainer: https://github.com/facebook/jest/pull/11529#issuecomment-102...

comment by bennettdams · 2022-05-11 · in Meta Is Transferring Jest to the OpenJS Foundation

…work. edit: just found this, which seems to confirm my anecdotal xp of esm in jest being weird https://github.com/facebook/jest/pull/11529#issuecomment-102...

comment by rattlesnakedave · 2022-02-16 · in State of JavaScript 2021

…maintainer handling all of it (which is very understandable and I'm grateful for all the work) https://github.com/facebook/jest/pull/11529#issuecomment-102...

comment by searchableguy · 2022-02-16 · in State of JavaScript 2021

>because jest looks unmaintained Help me understand what you meant by this? https://github.com/facebook/jest

comment by ArcMex · 2022-02-16 · in State of JavaScript 2021

▲ 2

What do y'all use for back end integration testing? (Services, Parallelism)

story by somethingAlex · 2022-02-11 · 0 comments

▲ 1

Jest v28.0.0-Alpha.0

story by STRiDEX · 2022-02-10 · 0 comments

SimenB reply: https://github.com/facebook/jest/pull/11529#issuecomment-102... tl;dr FB has offered him compensation and he turned it down for personal reasons.

comment by idontwantthis · 2022-02-02 · in Tell HN: Nobody at Facebook has worked on Jest for years

Comment: https://github.com/facebook/jest/pull/11529#issuecomment-102...

comment by tmvnty · 2022-02-01 · in Tell HN: Nobody at Facebook has worked on Jest for years

▲ 84

Tell HN: Nobody at Facebook has worked on Jest for years

story by tmvnty · 2022-02-01 · 14 comments

Proper Jest integration is blocked by async transformers ( https://github.com/facebook/jest/pull/9889 ) which should land as part of Jest 27, so we are mostly waiting on that. In the meanwhile, you can also consider: - @web/test-runner (…

comment by EvanYou · 2021-04-29 · in Why we switched from Webpack to Vite

…That way they will be Jest aware. Otherwise I'm afraid there's not much we can do here." See: https://github.com/facebook/jest/issues/6065

comment by cjones26 · 2020-12-07 · in Is Stencil a Better React?

Is this the one? https://jestjs.io/ or https://github.com/facebook/jest

comment by ceocoder · 2020-02-12 · in Using Python and Selenium for automated visual regression testing

▲ 1

Corrects Name for the Best Flavor of La Croix

story by plim8481 · 2020-01-21 · 0 comments

…what twice as fast is. I do know 'blazing fast' is meaningless. It's just deceptive. For reference: https://github.com/facebook/jest/issues/6694

comment by jwdunne · 2019-03-03 · in Pika: Making it easier to find, publish, install, and use modern packages on npm

…Jest is a Facebook project for testing React. They moved from Flow to Typescript. https://github.com/facebook/jest/pull/7554 Dont want this thread to go OT. But I do think Typescript will be an awesome counterpart to Swift-for-Tensorflow on

comment by sandGorgon · 2019-02-19 · in Deep learning may need a new programming language

…project moving from Flow to Typescript. Jest also announced a Typescript migration last week: https://github.com/facebook/jest/pull/7554

comment by kjaer · 2019-01-24 · in Yarn's Future – v2 and beyond

Jest is migrating to typescript: https://github.com/facebook/jest/pull/7554#issuecomment-4543...

comment by basil-rash · 2019-01-24 · in Yarn's Future – v2 and beyond

▲ 261

Migrate Jest to TypeScript

story by whatever_dude · 2019-01-16 · 125 comments

▲ 3

Jest is migrating to TypeScript

story by ggregoire · 2019-01-15 · 0 comments

▲ 3

Jest 23 released

story by napo · 2018-05-24 · 0 comments

▲ 1

Jest 22.2.0

story by stablemap · 2018-02-08 · 0 comments

…and Facebook's Jest[1] for testing React components. [0]: https://github.com/airbnb/enzyme [1]: https://github.com/facebook/jest

comment by joshmanders · 2017-04-28 · in Ask HN: What's the best way to learn about testing/TDD?

There is an open PR for this: https://github.com/facebook/jest/pull/2445 - it may end up in the next release at this rate

comment by orta · 2017-02-21 · in Jest 19: Immersive Watch Mode and Test Platform Improvements

…ability to re-run failing tests, or re-run tests on changed files. It was absurd. Edit: See, eg, https://github.com/facebook/jest/issues/116 opened 8 Aug 2014, and finally closed 17 Feb 2016. Quite a run. Also, there were tons of bugs with…

comment by Lazare · 2016-12-08 · in Jest – Painless JavaScript Testing

…pieces. I agree local development with many packages can be hard. For Jest we adopted `lerna` See https://github.com/facebook/jest and https://github.com/lerna/lerna which makes cross-package development in a mono-repo a lot of fun. Maybe…

comment by cpojer · 2016-10-11 · in Yarn – A new package manager for JavaScript