grafana/k6 · error

parsing mouse up options

Error message

parsing mouse up options: %w

What it means

Thrown by mouse.up(options) when parseMouseDownUpOptions fails — the same parser as mouse.down (browser/mouse_mapping.go:124-145). It accepts 'button' (string) and 'clickCount' (integer); a non-integer clickCount or non-object options value aborts the release before the CDP input event is sent, leaving a pressed button un-released for that call.

Solutions

1. Pass an integer: page.mouse().up({ clickCount: 1 }) or no options.
2. Normalize once and share the normalized object between down and up.
3. Coerce at the boundary: const count = Number(raw); if (!Number.isInteger(count)) throw ...
4. Keep the up options structurally identical to the down options you used.

Example fix

// before
await page.mouse().down();
await page.mouse().move(100, 100);
await page.mouse().up({ clickCount: cfg.clicks }); // "1"

// after
const count = Number(cfg.clicks) || 1;
await page.mouse().down();
await page.mouse().move(100, 100);
await page.mouse().up({ clickCount: count });

const count = raw == null ? undefined : Number(raw);
if (count != null && !Number.isInteger(count)) throw new Error(`clickCount must be an integer, got ${raw}`);
await page.mouse().down({ clickCount: count });
await page.mouse().up({ clickCount: count });

function isDownUpOptions(o) {
  if (o == null) return true;
  if (typeof o !== 'object') return false;
  return (o.clickCount == null || Number.isInteger(o.clickCount)) && (o.button == null || typeof o.button === 'string');
}

try { await page.mouse().up(opts); } catch (e) { if (/parsing mouse up options|clickCount must be an integer/.test(e.message)) { await page.mouse().up({ clickCount: parseInt(opts.clickCount, 10) }); } else throw e; }

When it happens

Trigger: page.mouse().up({ clickCount: '1' }) or { clickCount: 1.5 } in a press-move-release drag sequence; sharing one options object between down and up calls where the count was coerced to string upstream.

Common situations: Drag-and-drop helper functions that take options from callers; count values round-tripped through JSON; mismatches where down() succeeded with an integer but up() received the string variant of the same config.

Related errors

• parsing mouse click options
• parsing mouse double click options
• parsing mouse down options
• parsing mouse move options
• clickCount must be an integer, got

AI-assisted analysis of grafana/k6@01ffac6f24 (2026-08-18). Data as JSON: /api/errors/e2769843cfb23683. Report an issue: GitHub.

Appendix: source

Thrown at internal/js/modules/k6/browser/browser/mouse_mapping.go:46

				return nil, fmt.Errorf("parsing mouse double click options: %w", err)
			}
			return promise(vu, func() (any, error) {
				return nil, m.DblClick(x, y, popts) //nolint:wrapcheck
			}), nil
		},
		"down": func(opts sobek.Value) (*sobek.Promise, error) {
			popts, err := parseMouseDownUpOptions(rt, opts)
			if err != nil {
				return nil, fmt.Errorf("parsing mouse down options: %w", err)
			}
			return promise(vu, func() (any, error) {
				return nil, m.Down(popts) //nolint:wrapcheck
			}), nil
		},
		"up": func(opts sobek.Value) (*sobek.Promise, error) {
			popts, err := parseMouseDownUpOptions(rt, opts)
			if err != nil {
				return nil, fmt.Errorf("parsing mouse up options: %w", err)
			}
			return promise(vu, func() (any, error) {
				return nil, m.Up(popts) //nolint:wrapcheck
			}), nil
		},
		"move": func(x float64, y float64, opts sobek.Value) (*sobek.Promise, error) {
			popts, err := parseMouseMoveOptions(rt, opts)
			if err != nil {
				return nil, fmt.Errorf("parsing mouse move options: %w", err)
			}
			return promise(vu, func() (any, error) {
				return nil, m.Move(x, y, popts) //nolint:wrapcheck
			}), nil
		},
	}
}

// parseMouseClickOptions parses the mouse click options from a Sobek value.

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