doTextMimeAdd function
Adds a custom text MIME type mapping for a given file extension.
extension: The file extension (e.g., 'txt', 'csv').mimeType: The corresponding MIME type (e.g., 'text/plain', 'text/csv').
Implementation
void doTextMimeAdd(String extension, String mimeType) =>
_textMimeResolver.addExtension(extension, mimeType);