Wget in nodejs

wget.ts

import {randomBytes} from "node:crypto";
import fs from 'fs'


function randomString(length = 10) {
    return randomBytes(length).toString('hex');
}

interface wgetOpts {
    out_path?: string | null
    quiet?: boolean
    existsOk?: boolean
}

export async function wget(url: string, options?: wgetOpts) {
    var resp = await fetch(url)

    // Get size
    var size = resp.headers.get('content-length')
    var out_path = randomString(10) as string | null

    // Get filename
    const contentDisposition = resp.headers.get('content-disposition')
    if (contentDisposition) {
        const filenamePattern = /^.*filename[^;=\n]*=(([\'"]).*?\2|[^;\n]*)[\n;]?$/
        const matches = filenamePattern.exec(contentDisposition);
        if (matches && matches[1]) {
            var out_path = matches[1].replace("\"", "") as string | null; // Remove quotes if present
        }
    }
    // Check response
    if (!resp.ok) {
        throw `Status Error(${resp.status}): ${await resp.text()}`
    }
    // Start stream download
    const fileStream = fs.createWriteStream(out_path!)
    var totalSize = size ? parseInt(size, 10) : null
    var downloaded = 0
    const reader = resp.body?.getReader()
    while (true) {
        const result = await reader?.read()
        if (result?.done) {
            break
        }
        fileStream.write(result?.value)
        downloaded += result?.value?.length ?? 0
        if (totalSize) {
            const percentage = downloaded / totalSize * 100
            console.log(`${percentage.toFixed(0)}%`)
        }
    }
}