for enqueuing asset data via the WP api.
	 *
	 * Note: while this is hooked into print/admin_print_scripts, it still only
	 * happens if the script attached to `wc-settings` handle is enqueued. This
	 * is done to allow for any potentially expensive data generation to only
	 * happen for routes that need it.
	 */
	public function enqueue_asset_data() {
		if ( wp_script_is( $this->handle, 'enqueued' ) ) {
			$this->initialize_core_data();
			$this->execute_lazy_data();

			$data                          = rawurlencode( wp_json_encode( $this->data ) );
			$wc_settings_script            = "var wcSettings = JSON.parse( decodeURIComponent( '" . esc_js( $data ) . "' ) );";
			$preloaded_api_requests_script = '';

			if ( count( $this->preloaded_api_requests ) > 0 ) {
				$preloaded_api_requests        = rawurlencode( wp_json_encode( $this->preloaded_api_requests ) );
				$preloaded_api_requests_script = "wp.apiFetch.use( wp.apiFetch.createPreloadingMiddleware( JSON.parse( decodeURIComponent( '" . esc_js( $preloaded_api_requests ) . "' ) ) ) );";
			}

			wp_add_inline_script(
				$this->handle,
				$wc_settings_script . $preloaded_api_requests_script,
				'before'
			);
		}
	}

	/**
	 * See self::add() for docs.
	 *
	 * @param   string $key   Key for the data.
	 * @param   mixed  $data  Value for the data.
	 */
	protected function add_data( $key, $data ) {
		if ( ! is_string( $key ) ) {
			// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_trigger_error
			trigger_error( esc_html__( 'Key for the data being registered must be a string', 'woocommerce' ), E_USER_WARNING );
			return;
		}
		if ( $this->exists( $key ) ) {
			return;
		}
		if ( isset( $this->data[ $key ] ) ) {
			// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_trigger_error
			trigger_error( esc_html__( 'Overriding existing data with an already registered key is not allowed', 'woocommerce' ), E_USER_WARNING );
			return;
		}
		if ( \is_callable( $data ) ) {
			$this->lazy_data[ $key ] = $data;
			return;
		}
		$this->data[ $key ] = $data;
	}

	/**
	 * Exposes whether the current site is in debug mode or not.
	 *
	 * @return boolean  True means the site is in debug mode.
	 */
	protected function debug() {
		return defined( 'WP_DEBUG' ) && WP_DEBUG;
	}
}