Node.js script for pack .epub resources.

pack.js

const fs = require('fs')
const path = require('path')
const archiver = require('archiver')

var base_path = './epubs'

async function main() {
    const dir = await fs.promises.opendir(base_path)
    const books = {}
    for await (const ent of dir) {
        if (ent.isDirectory()) {
            books[ent.name] = false
        }
    }

    for (name in books) {
        const output = fs.createWriteStream(path.join(base_path, `${name}.epub`))
        const archive = archiver('zip', {
            zlib: { level: 9 }
        })

        output.on('close', () => {
            console.log(`${name}.epub ${archive.pointer()} bytes`)
        })

        output.on('error', (err) => {
            throw err;
        })

        archive.pipe(output)

        archive.append("application/epub+zip", { name: 'mimetype', store: true })
        archive.directory(path.join(base_path, name), false)
        archive.finalize()
    }
}

main()