How to pass custom class name on react and use scss? - reactjs

Question

I am trying to create a react component that has the class name as props being passed,
I have managed sending the props part successfully, however when I try to set the scss for the updated class name, I could not find a way to fix that, all of your input is appreciated.
Code of the component
Code of injecting the custom style class
Styles of the Variation
Output
Output of the Variation Class
Output of the Stylesheet
not sure what I am missing to connect all of them.
Thanks in advance.

Answer 1

As mentioned by Phil, your SCSS should be using &.secondary as the selector.
As for the difference in your scss class IDs and them not matching when you pass ${variant} to the className, your issue is that you are passing a raw string as the variant to the className and are using CSS modules for your SCSS (this is what handles namespacing them/adding the unique characters). To fix this, you need to use the imported style rather than a raw string for the className.
The way I usually address this is with an enum as the prop for different variants, or if there are only two a boolean, and then apply the imported style accordingly. A quick example of this, using your code would be:
const SectionTitle: FC<SectionTitleProps> = ({ title, isSecondary = false }) => (
<h3
className={`${styles.SectionTitle}${isSecondary ? styles.secondary : ''}`}
...
>
...
</h3>
);
I also find the classnames library helpful for this. It allows you to achieve the above with something I find a bit more readable, such as:
<h3
className={classNames(styles.SectionTitle, { [styles.secondary]: isSecondary } )}
...
>
...
</h3>
EDIT: Also including an example using classnames with an enum for different variants:
enum TitleVarient {
Default,
Secondary,
Accent,
}
const SectionTitle: FC<SectionTitleProps> = ({
title,
variant = TitleVarient.Default,
}) => (
<h3
className={classNames(styles.SectionTitle, {
[styles.secondary]: variant === TitleVarient.Secondary,
[styles.accent]: variant === TitleVarient.Accent,
})}
...
>
...
</h3>
);