How to set "a:link{.....}" via variable in React JS?

How to set “a:link{…}” via variable in React JS?

const styles = {
        fontSize: 15,
        a: {
            link: {
                 color: "red"
           },
            visited": {
          }
    },

But don’t work, Pl help me.

What are you doing with your styles variable???

And what kind of styling system are you using? CSS, SASS, CSS-in-JS?

you can’t set :link (for unvisited links) and :visited (for visited) with inline styles.

you can either define an additional css stylsheet, or you can also use something like https://github.com/styled-components/styled-components
which supports most css features

I would like to pass it into React Component.