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mdx-theme.tsx
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mdx-theme.tsx
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import React, {
RefObject,
createRef,
ComponentProps,
createContext,
ReactElement,
ReactNode,
useContext,
useEffect,
useState
} from 'react'
import { MDXProvider } from '@mdx-js/react'
import Link from 'next/link'
import { createPortal } from 'react-dom'
import { Code, Pre, Td, Th, Tr } from 'nextra/components'
import { useBlogContext } from './blog-context'
export const HeadingContext = createContext<
RefObject<HTMLHeadingElement | null>
>(createRef())
const H1 = ({ children }: { children?: ReactNode }): ReactElement => {
const ref = useContext(HeadingContext)
const { opts } = useBlogContext()
const [showHeading, setShowHeading] = useState(false)
useEffect(() => {
if (ref.current && opts.hasJsxInH1) {
setShowHeading(true)
}
}, [])
return <>{showHeading && createPortal(children, ref.current!)}</>
}
const createHeaderLink =
(Tag: `h${2 | 3 | 4 | 5 | 6}`) =>
({ children, id, ...props }: ComponentProps<'h2'>): ReactElement => {
return (
<Tag className={`subheading-${Tag}`} {...props}>
<span className="subheading-anchor -mt-8" id={id} />
<a href={`#${id}`}>{children}</a>
</Tag>
)
}
const A = ({ children, ...props }: ComponentProps<'a'>) => {
const isExternal = props.href && props.href.startsWith('https://')
if (isExternal) {
return (
<a target="_blank" rel="noreferrer" {...props}>
{children}
</a>
)
}
return props.href ? (
<Link href={props.href}>
<a {...props}>{children}</a>
</Link>
) : (
<></>
)
}
const components = {
h1: H1,
h2: createHeaderLink('h2'),
h3: createHeaderLink('h3'),
h4: createHeaderLink('h4'),
h5: createHeaderLink('h5'),
h6: createHeaderLink('h6'),
a: A,
pre({ children, ...props }: ComponentProps<'pre'>) {
return (
<div className="not-prose">
<Pre {...props}>{children}</Pre>
</div>
)
},
tr: Tr,
th: Th,
td: Td,
table(props: ComponentProps<'table'>) {
return <table className="not-prose" {...props} />
},
code: Code
}
const MDXTheme = ({ children }: { children: ReactNode }): ReactElement => {
return <MDXProvider components={components}>{children}</MDXProvider>
}
export default MDXTheme