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interface TocEntry {
title: string
url: string
items?: TocEntry[]
}
interface FlattenedTocEntry {
title: string
url: string
depth: number
}
export const flattenToc = (
entries: TocEntry[] = [],
depth = 0,
): FlattenedTocEntry[] =>
entries.reduce<FlattenedTocEntry[]>(
(acc, entry) =>
acc.concat(
{ title: entry.title, url: entry.url, depth },
flattenToc(entry.items, depth + 1),
),
[],
)
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