Fetch the authors of favourited works in pixiv

pixiv-users-of-favs.js

const max_page = 0

const version = ''

const user = ''

const make_url = (x) => `https://www.pixiv.net/ajax/user/${user}/illusts/bookmarks?tag=&offset=${x*48}&limit=48&rest=show&lang=en&version=${version}`

function* seq(start, end) {
    for (let i = start; i <= end; i++)
        yield i
}

const sleep = ms => new Promise(yes => setTimeout(() => yes(), ms))

const get_user_ids = x => x.body.works.map(x => x.userId)

async function main() {
    const users = new Set()

    for (const i of seq(0, max_page)) {
        const data = await fetch(make_url(i)).then(x => x.json())
        for (const x of get_user_ids(data))
            users.add(x)
        await sleep(5000)
    }

    console.log(Array.from(users).sort())
}

main()