flux-querybuilder/src/Functions/Measurement.php

<?php

namespace Hosterra\FluxBuilder\Functions;

class Measurement extends Base {
	/**
	 * @var string $measurement
	 */
	private $measurement;

	public function __construct( string $measurement ) {
		$this->measurement = $measurement;
	}

	public function __toString() {
		return '|> filter(fn: (r) => r._measurement == "' . (string) $this->measurement . '") ';
	}
}