Function convertToAbsoluteURL

convertToAbsoluteURL(base: string, relativePath: string): string
Converts a relative URL to an absolute URL.

Handles various URL formats:
- Relative paths: /path → https://example.com/path
- Parent directories: ../path → resolves correctly
- Protocol-relative: //cdn.com/file → https://cdn.com/file
- Already absolute URLs are returned unchanged
Parameters
- base: string
  The base URL to resolve against
- relativePath: string
  The relative or absolute path to convert
Returns string
The absolute URL
Example
```
convertToAbsoluteURL('https://example.com/page', '/images/pic.jpg')
// Returns: 'https://example.com/images/pic.jpg'

convertToAbsoluteURL('https://example.com/dir/', '../file.html')
// Returns: 'https://example.com/file.html'
```
- Defined in readable.ts:96