wp-includes/class-wp-customize-nav-menus.php:1551Exports data from PHP to JS.
public function export_preview_data() { // Why not wp_localize_script? Because we're not localizing, and it forces values into strings. $exports = array( 'navMenuInstanceArgs' => $this->preview_nav_menu_instance_args, ); wp_print_inline_script_tag( sprintf( 'var _wpCustomizePreviewNavMenusExports = %s;', wp_json_encode( $exports ) ) ); }Introduced in 4.3.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-customize-nav-menus.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.