Function isExternalUrl

isExternalUrl(str: string): boolean
Checks whether a string is a URL pointing at a different host than the current page.

In a browser, relative URLs are resolved against the document, so they (and absolute URLs on the current host) return false. Without a DOM, such as in Node.js, only absolute URLs with a host return true.
Parameters
- str: string
  The string to check.
Returns boolean
true if str is a URL with a host other than the current page's.
Example
```
isExternalUrl('https://example.com'); // true
isExternalUrl('/about'); // false
isExternalUrl('mailto:test@example.com'); // false (no host)
```
- Defined in types/isExternalUrl.ts:15