btrc-hub/frontend/src/components/WikiBody.tsx

import ReactMarkdown from 'react-markdown'
import { Link } from 'react-router-dom'

type Props = { body: string }


export default ({ body }: Props) => (
    <ReactMarkdown components={{ a: (
        ({ href, children }) => (['/', '.'].some (e => href?.startsWith (e))
                                 ? <Link to={href!}>{children}</Link>
                                 : <a href={href} target="_blank" rel="noopener noreferrer">{children}</a>)) }}>
      {body}
    </ReactMarkdown>)