ग्लोबल, fetch की उपलब्धता और फ़ाइल/नेटवर्क API

// Feature-detect fetch; do not assume it exists everywhere
const hasFetch = typeof fetch === "function";
console.log("fetch available?", hasFetch);

// If available, you could call fetch(...). For a safe demo we only log.
if (!hasFetch) {
  console.log("Provide a fallback or use a library in Node versions without fetch.");
}

// Files are a Node concern; browsers cannot read your disk directly
const hasRequire = typeof require === "function";
console.log("CommonJS require available?", hasRequire);

// Safe message instead of real file I/O (keeps the demo runnable everywhere)
if (hasRequire) {
  console.log("In Node you can use fs for files; in browsers you cannot.");
} else {
  console.log("No require here; likely a browser-like or sandboxed runtime.");
}

// URL is available in both environments
const u = new URL("https://example.com/path?x=1#top");
console.log("host:", u.host);
console.log("pathname:", u.pathname);
console.log("search:", u.search);
console.log("hash:", u.hash);