export const VIDEO_EXTENSIONS = new Set([ 'mkv', 'mp4', 'avi', 'webm', 'mov', 'flv', 'wmv', 'm4v', 'ts', 'm2ts', ]); export function hasVideoExtension(value: string): boolean { const normalized = value.trim().toLowerCase().replace(/^\./, ''); return normalized.length > 0 && VIDEO_EXTENSIONS.has(normalized); }