wp-includes/class-wp-theme-json-data.php:80Returns theme JSON object.
WP_Theme_JSON public function get_theme_json() { return $this->theme_json; }Introduced in 6.6.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-theme-json-data.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.