Code to detect browser version

gistfile1.txt

export const shouldSendSameSiteNone = useragent => {
 return !isSameSiteNoneIncompatible(useragent);
};
// Classes of browsers known to be incompatible.
const isSameSiteNoneIncompatible = useragent => {
 return (
   hasWebKitSameSiteBug(useragent) ||
   dropsUnrecognizedSameSiteCookies(useragent)
 );
};
const hasWebKitSameSiteBug = useragent => {
 return (
   isIosVersion(12, useragent) ||
   (isMacosxVersion(10, 14, useragent) &&
     (isSafari(useragent) || isMacEmbeddedBrowser(useragent)))
 );
};
const dropsUnrecognizedSameSiteCookies = useragent => {
 if (isUcBrowser(useragent)) {
   return !isUcBrowserVersionAtLeast(12, 13, 2, useragent);
 }
 
 return (
   isChromiumBased(useragent) &&
   isChromiumVersionAtLeast(51, useragent) &&
   !isChromiumVersionAtLeast(67, useragent)
 );
};
 
// Regex parsing of User-Agent string. (See note above!)
const isIosVersion = (major, useragent) => {
 // "\(iP.+; CPU .*OS (\d+)[\d]*.*\) AppleWebKit\/"
 const iosRegex = /\(iP.+; CPU .*OS (\d+)[\d]*.*\) AppleWebKit\//;
 // Extract digits from the first capturing group.
 const userAgentMatch = useragent.match(iosRegex) || [];
 return userAgentMatch[1] === major.toString();
};
 
const isMacosxVersion = (major, minor, useragent) => {
 // "\(Macintosh;.*Mac OS X (\d+)(\d+)[\d]*.*\) AppleWebKit\/"
 const macOsRegex = /\(Macintosh;.*Mac OS X (\d+)(\d+)[\d]*.*\) AppleWebKit\//;
 
 // Extract digits from first and second capturing groups.
 const userAgentMatch = useragent.match(macOsRegex) || [];
 return (
   userAgentMatch[1] === major.toString() &&
   userAgentMatch[2] === minor.toString()
 );
};
 
const isSafari = useragent => {
 // "Version\/.* Safari\/"
 const safariRegex = /Version\/.* Safari\//;
 return safariRegex.test(useragent) && !isChromiumBased(useragent);
};
 
const isMacEmbeddedBrowser = useragent => {
 // "^Mozilla\/[\.\d]+ \(Macintosh;.*Mac OS X [\d]+\) " + "AppleWebKit\/[\.\d]+ \(KHTML, like Gecko\)$"
 const macEmbeddedRegex = /^Mozilla\/[\.\d]+ \(Macintosh;.*Mac OS X [\d]+\) " + "AppleWebKit\/[\.\d]+ \(KHTML, like Gecko\)$/;
 return macEmbeddedRegex.test(useragent);
};
 
const isChromiumBased = useragent => {
 // "Chrom(e|ium)"
 const ChromiumRegex = /Chrom(e|ium)/;
 return ChromiumRegex.test(useragent);
};
 
const isChromiumVersionAtLeast = (major, useragent) => {
 // "Chrom[^ \/]+\/(\d+)[\.\d]* "
 const chromeVersionRegex = /Chrom[^ \/]+\/(\d+)[\.\d]* /;
 // Extract digits from the first capturing group.
 let version = 0;
 if (useragent.match(chromeVersionRegex))
   version = +(useragent.match(chromeVersionRegex)[1] || '');
 return version >= major;
};
 
const isUcBrowser = useragent => {
 // "UCBrowser\/"
 const ucBrowserRegex = /UCBrowser\//;
 return ucBrowserRegex.test(useragent);
};
 
const isUcBrowserVersionAtLeast = (major, minor, build, useragent) => {
 // "UCBrowser\/(\d+)\.(\d+)\.(\d+)[\.\d]* "
 const ucBrowserVersionRegex = /UCBrowser\/(\d+)\.(\d+)\.(\d+)[\.\d]* /;
 // Extract digits from three capturing groups.
 const major_version = +useragent.match(ucBrowserVersionRegex)[1];
 const minor_version = +useragent.match(ucBrowserVersionRegex)[2];
 const build_version = +useragent.match(ucBrowserVersionRegex)[3];
 if (major_version !== major) {
   return major_version > major;
 }
 
 if (minor_version !== minor) {
   return minor_version > minor;
 }
 
 return build_version >= build;
};