How to use the ytdl-core.cache function in ytdl-core

opts.outputHelp((help) => {
    return chalk.red('\n  url argument is required\n') + help;
  });
  process.exit(1);
}

const path         = require('path');
const fs           = require('fs');
const ytdl         = require('ytdl-core');
const homedir      = require('homedir');
const util         = require('../lib/util');

const label = chalk.bold.gray;


ytdl.cache.info.timeout = 0;
if (opts.cache !== false) {
  // Keep cache in file.
  const cachefile = path.resolve(homedir(), '.ytdl-cache.json');
  let cache = {};
  fs.readFile(cachefile, (err, contents) => {
    if (err) return;
    try {
      cache = JSON.parse(contents);
    } catch (err) {
      console.error(`Badly formatted cachefile (${cachefile}): ${err.message}`);
    }
  });

  ytdl.cache.sig.get = key => cache[key];
  ytdl.cache.sig.set = (key, value) => {
    cache[key] = value;

ytdl.cache.info.timeout = 0;
if (opts.cache !== false) {
  // Keep cache in file.
  const cachefile = path.resolve(homedir(), '.ytdl-cache.json');
  let cache = {};
  fs.readFile(cachefile, (err, contents) => {
    if (err) return;
    try {
      cache = JSON.parse(contents);
    } catch (err) {
      console.error(`Badly formatted cachefile (${cachefile}): ${err.message}`);
    }
  });

  ytdl.cache.sig.get = key => cache[key];
  ytdl.cache.sig.set = (key, value) => {
    cache[key] = value;
    fs.writeFile(cachefile,
      JSON.stringify(cache, null, 2), () => {});
  };
}


/**
 * Prints basic video information.
 *
 * @param {Object} info
 * @param {boolean} live
 */
const printVideoInfo = (info, live) => {
  console.log();

ytdl.cache.info.timeout = 0;
if (opts.cache !== false) {
  // Keep cache in file.
  const cachefile = path.resolve(homedir(), '.ytdl-cache.json');
  let cache = {};
  fs.readFile(cachefile, (err, contents) => {
    if (err) return;
    try {
      cache = JSON.parse(contents);
    } catch (err) {
      console.error(`Badly formatted cachefile (${cachefile}): ${err.message}`);
    }
  });

  ytdl.cache.sig.get = key => cache[key];
  ytdl.cache.sig.set = (key, value) => {
    cache[key] = value;
    fs.writeFile(cachefile,
      JSON.stringify(cache, null, 2), () => {});
  };
}


/**
 * Prints basic video information.
 *
 * @param {Object} info
 * @param {boolean} live
 */
const printVideoInfo = (info, live) => {
  console.log();
  console.log(label('title: ') + info.title);