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Mention facebook/jest#2549 in the README (#1700)

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Natalie Weizenbaum 2022-05-23 16:08:52 -07:00 committed by GitHub
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@ -142,6 +142,20 @@ Sass's support for the legacy JavaScript API has the following limitations:
[`precision`]: https://github.com/sass/node-sass#precision
[`sourceComments`]: https://github.com/sass/node-sass#sourcecomments
#### Using Sass with Jest
If you're using [Jest] to run your tests, be aware that it has a [longstanding
bug] where its default test environment breaks JavaScript's built-in
[`instanceof` operator]. Dart Sass's JS package uses `instanceof` fairly
heavily, so in order to avoid breaking Sass you'll need to install
[`jest-environment-node-single-context`] and add `testEnvironment:
'jest-environment-node-single-context'` to your Jest config.
[Jest]: https://jestjs.io/
[longstanding bug]: https://github.com/facebook/jest/issues/2549
[`instanceof` operator]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/instanceof
[`jest-environment-node-single-context`]: https://www.npmjs.com/package/jest-environment-node-single-context
### From Pub
If you're a Dart user, you can install Dart Sass globally using `pub global