public function register_on_action( string $action, string $class, string ...$alias ): void {
		if ( did_action( $action ) ) {
			// If the action has already fired, register the provider immediately.
			$this->register( $class, ...$alias );

			return;
		}

		// If the action has not fired yet, register the provider when it does.
		$registration_closure = function () use ( $action, $class, $alias, &$registration_closure ) {
			// Remove the closure from the action to avoid calling it again.
			remove_action( $action, $registration_closure );
			$this->register( $class, ...$alias );
		};
		add_action( $action, $registration_closure );
	}