What is CSS-in-JS?
CSS-in-JS is a styling technique where JavaScript is used to style components. When this JavaScript is parsed, CSS is generated (usually as an <style> element) and attached to the DOM. It allows you to abstract CSS to the component level itself, using JavaScript to describe styles in a declarative and maintainable way.
In the ecosystem of some client-side libraries, such as React, this method is very common. So we decided to discuss how to use CSS-in-JS in Aurelia.