Do you still write HTML/CSS files if you're using React.js?

Question

I can't seem to understand the workflow with react.js. Do you still need to write HTML and CSS straight up?

Answer 1

Yes, do you still have to write HTML and CSS, but you have different workflow for both

HTML you write on render function inside your javascript file, as example below:

const HelloMessage = (props) => {
    return (
        <div>Hello { props.name }</div>
    );
}

ReactDOM.render(<HelloMessage name="Jane" />, mountNode);

CSS you can write in two ways

1. As css modules, you can code a sass/less/stylus or even css file, then you import inside your javascript file and using classname (npm module) you call it

2. As styled component, in this case you code css as a JSON inside your javascript file