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Test-driven Development with React

Styled Components

Explore how to use styled-components in React to write CSS as JavaScript functions tied to component props. Learn the benefits of CSS-in-JS for avoiding style conflicts, enhancing maintainability, and enabling unit testing of styles. This lesson helps you understand the practical integration of styled-components in a test-driven development workflow.

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Getting started with styled-components

As apps grow, they can contain thousands of style rules, too many for a single person to keep track of. This leads to unintended conflicts. For example, which of the styles below will apply to a disabled button with the white class?

// StylesheetA.css
button.white {
  background-color: white;
  color: black;
}

// StylesheetB.css
button:disabled {
  background-color: grey;
  color: darkgrey;
}

The answer is that it depends on the order the stylesheets ...