WP_Script_Modules::print_script_module_preloads()

Source

public function print_script_module_preloads() {
	$dependency_ids = $this->get_sorted_dependencies( $this->queue, array( 'static' ) );
	foreach ( $dependency_ids as $id ) {
		// Don't preload if it's marked for enqueue.
		if ( in_array( $id, $this->queue, true ) ) {
			continue;
		}

		$src = $this->get_src( $id );
		if ( '' === $src ) {
			continue;
		}

		$enqueued_dependents   = array_intersect( $this->get_recursive_dependents( $id ), $this->queue );
		$highest_fetchpriority = $this->get_highest_fetchpriority( $enqueued_dependents );
		printf(
			'<link rel="modulepreload" href="%s" id="%s"',
			esc_url( $src ),
			esc_attr( $id . '-js-modulepreload' )
		);
		if ( 'auto' !== $highest_fetchpriority ) {
			printf( ' fetchpriority="%s"', esc_attr( $highest_fetchpriority ) );
		}
		if ( $highest_fetchpriority !== $this->registered[ $id ]['fetchpriority'] && 'auto' !== $this->registered[ $id ]['fetchpriority'] ) {
			printf( ' data-wp-fetchpriority="%s"', esc_attr( $this->registered[ $id ]['fetchpriority'] ) );
		}
		echo ">\n";
	}
}

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