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If you're running out of memory or your tests are hanging when you run Jest tests on CircleCI, try running jest --maxWorkers=2 instead of just jest. Why? On my current project, we're using Jest and Enzyme to create unit tests which we run as a step in our CircleCI build process. Every time a PR is opened on GitHub, CircleCI rebuilds the project, runs the tests, and lets us know if that PR's code i
CSS variables, like variables in any programming language, let us reference the same values over and over. As of April 2017, they are supported by all modern browsers and are an effective way to write tight, clean styles. I'll be walking through the basics of CSS variables, how they are different from Sass variables, and how to provide legacy support. How to use them Any CSS property -- color, siz
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