I started developing a React component library and wanted to reuse some SCSS code we shared with other non-React projects.

To achieve this, I tried using SASS modules in a React component.

Simple use case works fine, but I'm creating a component library and I need multiple style combinations for certain components like buttons.

Now, I have a problem with the Button component. The component is very simple, but it has 3 different variant values.

This is Button.tsx file:

import React from "react";
import styles from "./Button.module.scss";

type Variant = "default" | "primary" | "tertiary";

interface Props {
  children: String;
  variant: Variant;
}

export const Button: React.FC<Props> = ({ children, variant }) => {
  return <button className={`${styles.button} ${variant}`}>{children}</button>;
};

This is Button.module.scss File:

.button {
  border: none;
  padding: 0.5rem 1.5rem;
  border-radius: 0.25rem;
  background-color: grey;
  color: white;

  &.default {
    background-color: green;
  }
  &.primary {
    background-color: red;
  }
}

What I expected is that if I use a component like <Buttonvariant="default">I'm green</Button> there will be a green button, but what I get is Gray button.

This is an example on codesandbox

I'm stuck on this issue, can anyone help me apply different styles based on prop value?