Function getFileExtension

getFileExtension(filename: string): string | undefined
Extracts the file extension from a filename. Returns undefined when no valid extension can be determined.
Parameters
- filename: string
  The filename to extract the extension from.
Returns string | undefined
The file extension, or undefined if it cannot be determined.
- Defined in src/packages/core/utils/path/get-file-extension.function.ts:7