/**

* Safari compatibility utilities

*/

/**

* Detect if the current browser is Safari

*/

const isSafari = (): boolean => {

if (typeof window === 'undefined' || typeof navigator === 'undefined') {

return false;

}

const ua = navigator.userAgent;

// Safari but not Chrome (Chrome UA also contains "Safari")

return (

ua.includes('Safari') &&

!ua.includes('Chrome') &&

!ua.includes('Chromium')

);

};

/**

* Test if the browser supports the regex features used by remark-gfm.

* remark-gfm uses unicode property escapes (\p{P}) which older Safari

* misinterprets as named capture groups, throwing "invalid group specifier name"

*/

const hasRemarkGfmRegexIssue = (): boolean => {

try {

// Test the pattern remark-gfm uses in transformGfmAutolinkLiterals

new RegExp('(?<=\\p{P})a', 'u');

return false; // Regex works fine

} catch {

return true; // Regex throws error

}

};

/**

* Returns true if remarkGfm should be disabled.

* Only disables for Safari browsers that have the regex issue.

*/

let shouldDisableCached: boolean | null = null;

export const getIsOldSafari = (): boolean => {

if (shouldDisableCached === null) {

shouldDisableCached = isSafari() && hasRemarkGfmRegexIssue();

}

return shouldDisableCached;

};