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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 479x 479x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 678x 678x 678x 678x 678x 678x 678x 678x 1x 1x 1x 1x 479x 479x 479x 1x 678x 678x 678x 678x 678x 678x 678x 678x | interface UserAgentVersionNumber {
readonly major: number;
readonly minor?: number;
}
class UserAgentVersion implements UserAgentVersionNumber {
readonly major: number;
readonly minor?: number;
constructor(major: number, minor?: number) {
this.major = major;
this.minor = minor;
}
public static parse(version: string): UserAgentVersion {
const parts = version.split('.');
const major = parseInt(parts[0]);
const minor = parts.length >= 2 ? parseInt(parts[1]) : undefined;
return new UserAgentVersion(major, minor);
}
public largerOrEqualThan(b: UserAgentVersionNumber): boolean {
return (
this.major > b.major ||
(this.major === b.major && (this.minor ?? 0) >= (b.minor ?? 0))
);
}
public lessThan(b: UserAgentVersionNumber): boolean {
return !this.largerOrEqualThan(b);
}
}
/**
* Test that the browser is based on WebKit (eg Safari)
*/
export function isWebkit() {
return !isBlink() && window.navigator.userAgent.includes('AppleWebKit/');
}
/**
* Test if the user agent is reporting usage of the 'Gecko' engine (i.e. Firefox's rendering engine).
* Optionally may specify additional limits on the version number, if a limit is not set no lower or upper
* limit is enforced respectively.
* @param minVersion minimum version (inclusive)
* @param maxVersion maximum version (exclusive)
* @returns `true` if usage of the Gecko engine within the version bounds is detected, `false` otherwise
*/
export function isGecko(
minVersion?: UserAgentVersionNumber,
maxVersion?: UserAgentVersionNumber,
): boolean {
const version = getGeckoVersion();
if (version === undefined) {
return false;
} else {
return (
(minVersion !== undefined
? version.largerOrEqualThan(minVersion)
: true) &&
(maxVersion !== undefined ? version.lessThan(maxVersion) : true)
);
}
}
/**
* Test that the browser is based on Blink (eg Chrome, Edge)
*/
function isBlink() {
return window.navigator.userAgent.includes('Chrome/');
}
function getGeckoVersion(): UserAgentVersion | undefined {
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/User-Agent/Firefox
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Browser_detection_using_the_user_agent#rendering_engine
const userAgent = window.navigator.userAgent;
if (userAgent.includes('Gecko/')) {
// quick first check without regex to improve performance when it's not Gecko
const regex = /^.+ \((.+; )?rv:([0-9.]+)\)(.+)? Gecko\/[0-9.]+( .+)?$/;
const matches = regex.exec(userAgent);
if (matches) {
const versionString = matches[2];
return UserAgentVersion.parse(versionString);
} else {
return undefined;
}
} else {
return undefined;
}
}
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