export type MIMEType = string & { _mimeTypeBrand: any }; export const APPLICATION_OCTET_STREAM = 'application/octet-stream' as MIMEType; export const APPLICATION_JSON = 'application/json' as MIMEType; export const AUDIO_AAC = 'audio/aac' as MIMEType; export const AUDIO_WEBM = 'audio/webm' as MIMEType; export const AUDIO_MP3 = 'audio/mp3' as MIMEType; export const IMAGE_GIF = 'image/gif' as MIMEType; export const IMAGE_JPEG = 'image/jpeg' as MIMEType; export const VIDEO_MP4 = 'video/mp4' as MIMEType; export const VIDEO_QUICKTIME = 'video/quicktime' as MIMEType; export const isJPEG = (value: MIMEType): boolean => value === 'image/jpeg'; export const isImage = (value?: MIMEType): boolean => !!value && value.startsWith('image/'); export const isVideo = (value: MIMEType): boolean => value && value.startsWith('video/'); export const isAudio = (value: MIMEType): boolean => value && value.startsWith('audio/');