wp-includes/rest-api.php:1165Collects cookie authentication status.
function rest_cookie_collect_status() { global $wp_rest_auth_cookie; $status_type = current_action(); if ( 'auth_cookie_valid' !== $status_type ) { $wp_rest_auth_cookie = substr( $status_type, 12 ); return; } $wp_rest_auth_cookie = true;}Introduced in 4.4.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/rest-api.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.