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export const getMimeType = (filename: string, mimes = baseMimes): string | undefined => {  const regexp = /\.([a-zA-Z0-9]+?)$/  const match = filename.match(regexp)  if (!match) {    return  }  let mimeType = mimes[match[1]]  if ((mimeType && mimeType.startsWith('text')) || mimeType === 'application/json') {    mimeType += '; charset=utf-8'  }  return mimeType}
export const getExtension = (mimeType: string): string | undefined => {  for (const ext in baseMimes) {    if (baseMimes[ext] === mimeType) {      return ext    }  }}
const baseMimes: Record<string, string> = {  aac: 'audio/aac',  avi: 'video/x-msvideo',  avif: 'image/avif',  av1: 'video/av1',  bin: 'application/octet-stream',  bmp: 'image/bmp',  css: 'text/css',  csv: 'text/csv',  eot: 'application/vnd.ms-fontobject',  epub: 'application/epub+zip',  gif: 'image/gif',  gz: 'application/gzip',  htm: 'text/html',  html: 'text/html',  ico: 'image/x-icon',  ics: 'text/calendar',  jpeg: 'image/jpeg',  jpg: 'image/jpeg',  js: 'text/javascript',  json: 'application/json',  jsonld: 'application/ld+json',  map: 'application/json',  mid: 'audio/x-midi',  midi: 'audio/x-midi',  mjs: 'text/javascript',  mp3: 'audio/mpeg',  mp4: 'video/mp4',  mpeg: 'video/mpeg',  oga: 'audio/ogg',  ogv: 'video/ogg',  ogx: 'application/ogg',  opus: 'audio/opus',  otf: 'font/otf',  pdf: 'application/pdf',  png: 'image/png',  rtf: 'application/rtf',  svg: 'image/svg+xml',  tif: 'image/tiff',  tiff: 'image/tiff',  ts: 'video/mp2t',  ttf: 'font/ttf',  txt: 'text/plain',  wasm: 'application/wasm',  webm: 'video/webm',  weba: 'audio/webm',  webp: 'image/webp',  woff: 'font/woff',  woff2: 'font/woff2',  xhtml: 'application/xhtml+xml',  xml: 'application/xml',  zip: 'application/zip',  '3gp': 'video/3gpp',  '3g2': 'video/3gpp2',  gltf: 'model/gltf+json',  glb: 'model/gltf-binary',}