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import React from 'react'
type Component = React.ReactElement
type ContextType = {
outlet: Component | null
append(id: string, component: Component): void
remove(id: string): void
}
type ComponentMap = {
[id: string]: Component
}
export const Context = React.createContext<ContextType>({
outlet: null,
append: () => {},
remove: () => {},
})
export function Provider(props: React.PropsWithChildren<{}>) {
const map = React.useRef<ComponentMap>({})
const [outlet, setOutlet] = React.useState<ContextType['outlet']>(null)
const append = React.useCallback<ContextType['append']>((id, component) => {
if (map.current[id]) return
map.current[id] = <React.Fragment key={id}>{component}</React.Fragment>
setOutlet(<>{Object.values(map.current)}</>)
}, [])
const remove = React.useCallback<ContextType['remove']>(id => {
delete map.current[id]
setOutlet(<>{Object.values(map.current)}</>)
}, [])
return (
<Context.Provider value={{outlet, append, remove}}>
{props.children}
</Context.Provider>
)
}
export function Outlet() {
const ctx = React.useContext(Context)
return ctx.outlet
}
export function Portal({children}: React.PropsWithChildren<{}>) {
const {append, remove} = React.useContext(Context)
const id = React.useId()
React.useEffect(() => {
append(id, children as Component)
return () => remove(id)
}, [id, children, append, remove])
return null
}
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