When browsing through certain SCSS files, I've noticed the following syntax:
:global {
/* ... */
}
It's unclear to me if this is a native feature of SCSS or CSS. I attempted to research it but didn't come across any definitive answers immediately.
The :global operator is crucial in the realm of CSS Modules. Modular CSS hinges on a CSS Modules compiler to contain CSS styles within their relevant modules (such as a React component).
Let's delve into an illustration from a React module (within the file ErrorMessaging.less for the ErrorMessaging.jsx React component):
:global(.ocssContainer) {
.ui_column {
padding-left: 0;
}
}
This snippet undergoes compilation and transforms into:
.ErrorMessaging__alertContainer--1I-Cz .ocssContainer .ErrorMessaging__ui_column--3uMUS {
padding-left: 0;
}
And now, let's introduce a :global modifier to the existing .ui_column:
:global(.ocssContainer) {
:global(.ui_column) {
padding-left: 0;
}
}
The resulting compiled output morphs into:
.ErrorMessaging__alertContainer--1I-Cz .ocssContainer .ui_column {
padding-left: 0;
}
With this modification, the style from .ui_column can extend its reach to any child element with that specific style, including those nested within a child React component, transcending beyond the confines of the original ErrorMessaging React component.
It appears that the website is utilizing CSS Modules. According to the documentation, they explain:
The use of :global switches the current selector or identifier to the global scope. For example, :global(.xxx) or @keyframes :global(xxx) declares the specified content within the parentheses in the global scope.
The :global selector keyword in css modules is crucial for specifying that a class should not be limited to the component where it's defined. By using this selector, the class becomes accessible globally within the application, rather than being restricted to just one component. For instance, if you have a class called .is-global-class in a CSS Module file, you can use :global(.is-global-class) to apply that class to an element and utilize it across the entire application.
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