Error: Cannot find module 'escpos-usb'

HI.
I run code in documentation and get exception.
Could You help me, please?

(node:20296) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.
(node:20296) UnhandledPromiseRejectionWarning: Error: Cannot find module 'escpos-usb'
Require stack:

• /home/slexsys/projects/esc_pos_ang/electron-quick-start/main.js
• /home/slexsys/projects/esc_pos_ang/electron-quick-start/node_modules/electron/dist/resources/default_app.asar/main.js
• at Module._resolveFilename (internal/modules/cjs/loader.js:961:15)
  at Function.o._resolveFilename (electron/js2c/browser_init.js:257:921)
  at Module._load (internal/modules/cjs/loader.js:844:27)
  at Function.Module._load (electron/js2c/asar.js:769:28)
  at Module.require (internal/modules/cjs/loader.js:1023:19)
  at require (internal/modules/cjs/helpers.js:77:18)
  at escPos (/home/slexsys/projects/esc_pos_ang/electron-quick-start/main.js:24:18)
  at createWindow (/home/slexsys/projects/esc_pos_ang/electron-quick-start/main.js:17:3)
  at /home/slexsys/projects/esc_pos_ang/electron-quick-start/main.js:65:3
  (node:20296) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
  (node:20296) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

The stack trace points to electron-quick-start/main.js, especially the require at line 24; begin by checking the documented example and how it references escpos-usb. Done means the example starts without the Cannot find module error, with the required setup clearly documented.