starlight-auto-sidebar/middleware.ts

Starlight plugin to tweak autogenerated sidebar groups.

import { defineRouteMiddleware } from '@astrojs/starlight/route-data'
import context from 'virtual:starlight-auto-sidebar/context'

import { getProjectMetadata } from './libs/metadata'
import { updatePageSidebar } from './libs/sidebar'

export const onRequest = defineRouteMiddleware(async ({ locals }) => {
  const { starlightRoute } = locals

  const metadata = await getProjectMetadata(context.sidebar)
  const { sidebar, prev, next } = await updatePageSidebar(
    starlightRoute.sidebar,
    metadata,
    starlightRoute.locale,
    context,
  )

  starlightRoute.sidebar = sidebar

  if (prev !== undefined) starlightRoute.pagination.prev = prev ?? undefined
  if (next !== undefined) starlightRoute.pagination.next = next ?? undefined
})