grafana/k6 · error

restoring viewport: %w

Error message

restoring viewport: %w

What it means

Error "restoring viewport: %w" thrown in grafana/k6.

Source

Thrown at internal/js/modules/k6/browser/common/screenshotter.go:350

	documentRect := bbox
	documentRect.X += returnVal.X
	documentRect.Y += returnVal.Y

	buf, err := s.screenshot(
		h.frame.page.session,
		documentRect.enclosingIntRect(),
		nil, // viewportRect
		format,
		opts.OmitBackground,
		opts.Quality,
		opts.Path,
	)
	if err != nil {
		return nil, err
	}
	if overriddenViewportSize != nil {
		if err := s.restoreViewport(h.frame.page, originalViewportSize); err != nil {
			return nil, fmt.Errorf("restoring viewport: %w", err)
		}
	}

	return buf, nil
}

func (s *screenshotter) screenshotPage(p *Page, opts *PageScreenshotOptions) ([]byte, error) {
	format := opts.Format

	// Infer file format by path
	if opts.Path != "" && opts.Format != "png" && opts.Format != "jpeg" {
		if strings.HasSuffix(opts.Path, ".jpg") || strings.HasSuffix(opts.Path, ".jpeg") {
			format = "jpeg"
		}
	}

	viewportSize, originalViewportSize, err := s.originalViewportSize(p)
	if err != nil {

View on GitHub (pinned to 93accf6570)

When it happens

Trigger: Thrown at internal/js/modules/k6/browser/common/screenshotter.go:350 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of grafana/k6@93accf6570 (2026-08-15). Data as JSON: /api/errors/41b168f9891cb368. Report an issue: GitHub.