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chore: fix date and heading in blog post #9977

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May 5, 2020
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chore: fix date and heading in blog post #9977

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4 changes: 1 addition & 3 deletions website/blog/2020-05-06-jest-26.md → website/blog/2020-05-05-jest-26.md
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Expand Up @@ -5,8 +5,6 @@ authorURL: http://twitter.com/cpojer
authorFBID: 100000023028168
---

# Jest 26: Tick Tock

When we started rebuilding Jest five years ago our goal was to provide a batteries-included zero-configuration test runner that is approachable for beginners, extensible for almost all testing use cases and scalable to large projects. One of the instrumental releases was [Jest 15](https://jestjs.io/blog/2016/09/01/jest-15) which tied everything together and provided good defaults that allowed people to run Jest often without any setup. However, this approach has a big downside as Jest installs a lot of dependencies into your projects that you may not need.

We are now beginning to address this shortcoming and are working on reducing Jest’s install size while keeping it approachable and extensible. We have made the following breaking changes in Jest 26:
Expand Down Expand Up @@ -41,7 +39,7 @@ Jest will continue to ship with `babel-jest` enabled by default. It currently po

With Jest 26 we are shipping a new implementation of fake timers based on `@sinonjs/fake-timers`. We've wanted to do this for years and are happy this has finally progressed far enough to support all of Jest's existing fake timer use cases.

The new implementation comes with extra features such as mocking `Date`, `queueMicrotask` and more, see [this README](https://github.com/sinonjs/fake-timers/blob/master/README.md). It works transparently using the existing timer APIs like `jest.runAllTimers()` – check out the documentation [on our website](https://jestjs.io/docs/en/timer-mocks).
The new implementation comes with extra features such as mocking `Date`, `queueMicrotask` and more, see [this README](https://github.com/sinonjs/fake-timers/blob/master/README.md). It works transparently using the existing timer APIs like `jest.runAllTimers()` – check out the documentation [on our website](/docs/en/timer-mocks).

We are confident this implementation is ready for prime time, however we don't want to force people to rewrite their tests if they depend on subtle differences between the old and new implementation. In Jest 26, this new implementation will remain _opt-in_ and can be activated by calling `jest.useFakeTimers('modern')` or by passing `modern` to the `timers` option in your config if you opted all tests into fake timers previously.

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