Please, how to execute the wireguard.js script correctly?

[Jibun-no-Kage]

Please, how to execute the wireguard.js script correctly? I have node installed, but the script does not execute?

# node -v
v18.19.1

# node wireguard.js
/root/wireguard.js:174
        window.wireguard = {
        ^

ReferenceError: window is not defined
    at /root/wireguard.js:174:2
    at Object.<anonymous> (/root/wireguard.js:184:3)
    at Module._compile (node:internal/modules/cjs/loader:1356:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1414:10)
    at Module.load (node:internal/modules/cjs/loader:1197:32)
    at Module._load (node:internal/modules/cjs/loader:1013:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:128:12)
    at node:internal/main/run_main_module:28:49

Node.js v18.19.1