text: export function isId3v2(buf) {
      return buf[0] === 0x49 && buf[1] === 0x44 && buf[2] === 0x33;
  }
  
  export function getMimeType(buf) {
      // https://github.com/sindresorhus/file-type
      if (!buf || !buf.length) {
          return null;
      }
      if (buf[0] === 0xff && buf[1] === 0xd8 && buf[2] === 0xff) {
          return 'image/jpeg';
      }
      if (buf[0] === 0x89 && buf[1] === 0x50 && buf[2] === 0x4e && buf[3] === 0x47) {
          return 'image/png';
      }
      if (buf[0] === 0x47 && buf[1] === 0x49 && buf[2] === 0x46) {
          return 'image/gif';
      }
      if (buf[8] === 0x57 && buf[9] === 0x45 && buf[10] === 0x42 && buf[11] === 0x50) {
          return 'image/webp';
      }
      const isLeTiff = buf[0] === 0x49 && buf[1] === 0x49 && buf[2] === 0x2a && buf[3] === 0;
      const isBeTiff = buf[0] === 0x4d && buf[1] === 0x4d && buf[2] === 0 && buf[3] === 0x2a;
  
      if (isLeTiff || isBeTiff) {
          return 'image/tiff';
      }
      if (buf[0] === 0x42 && buf[1] === 0x4d) {
          return 'image/bmp';
      }
      if (buf[0] === 0 && buf[1] === 0 && buf[2] === 1 && buf[3] === 0) {
          return 'image/x-icon';
      }
      return null;
  }
  