grafana/k6 · error

parsing locator tap options

Error message

parsing locator tap options: %w

What it means

Thrown synchronously when the options argument to locator.tap(opts) fails to parse. The mapping (locator_mapping.go:406-410) builds common.FrameTapOptions — notably seeded with lo.DefaultTimeout() rather than the locator timeout — and wraps Parse failures as "parsing locator tap options: %w". Parse (frame_options.go:571-592) runs the pointer base (position exported to map[string]float64, trial, force, noWaitAfter, timeout) then exports "modifiers" to []string; those ExportTo conversions are the realistic failure points.

Solutions

1. Pass position as { x: <number>, y: <number> } with numeric values relative to the element's top-left corner
2. Pass modifiers as an array of modifier key strings, e.g. ['Alt', 'Shift']
3. Coerce computed coordinates with Number() before building the options object
4. Validate the options shape before calling tap when coordinates come from external data; try/catch otherwise

Example fix

// before
const p = await el.getAttribute('data-tap'); // "12,34"
const [x, y] = p.split(',');
await locator.tap({ position: { x, y } }); // strings -> parse error

// after
const [x, y] = p.split(',').map(Number);
await locator.tap({ position: { x, y } });

function assertTapOptions(opts) {
  if (opts == null) return;
  if (typeof opts !== 'object' || Array.isArray(opts)) throw new TypeError('tap options must be an object');
  if (opts.position != null) {
    const p = opts.position;
    if (typeof p !== 'object' || !Number.isFinite(p.x) || !Number.isFinite(p.y))
      throw new TypeError(`position must be { x: number, y: number }, got ${JSON.stringify(p)}`);
  }
  if (opts.modifiers != null) {
    if (!Array.isArray(opts.modifiers) || opts.modifiers.some(m => typeof m !== 'string'))
      throw new TypeError('modifiers must be an array of strings');
  }
}
assertTapOptions(opts);
await locator.tap(opts);

function isTapOptions(o) {
  if (o == null) return true;
  if (typeof o !== 'object') return false;
  const pOk = o.position === undefined ||
    (typeof o.position === 'object' && Number.isFinite(o.position.x) && Number.isFinite(o.position.y));
  const mOk = o.modifiers === undefined ||
    (Array.isArray(o.modifiers) && o.modifiers.every(m => typeof m === 'string'));
  return pOk && mOk;
}

try { await locator.tap(opts); } catch (e) { if (String(e).includes('parsing locator tap options')) throw new Error(`bad tap position/modifiers: ${JSON.stringify(opts)}`); throw e; }

When it happens

Trigger: locator.tap({ position: 'center' }) or position: { x: '10', y: 20 } with string coordinates; position that is not an object; modifiers: 'Shift' instead of an array; modifiers containing numbers; throwing getters or Proxy traps on options.

Common situations: Mobile emulation tests tapping at coordinates computed from element bounding boxes where values become strings; passing Playwright-style option objects with a bare-string modifiers; helper functions that conditionally build position and sometimes pass undefined fields.

Related errors

• parsing hover options
• parsing double click options
• parsing element tap options
• parsing hover options
• parsing hover options

AI-assisted analysis of grafana/k6@8d06114777 (2026-09-14). Data as JSON: /api/errors/c341ce3754dcb788. Report an issue: GitHub.

Appendix: source

Thrown at internal/js/modules/k6/browser/browser/locator_mapping.go:410

				return nil, fmt.Errorf("parsing type options: %w", err)
			}
			return promise(vu, func() (any, error) {
				return nil, lo.Type(text, copts) //nolint:wrapcheck
			}), nil
		},
		"hover": func(opts sobek.Value) (*sobek.Promise, error) {
			copts, err := parseFrameHoverOptions(rt, opts, lo.Timeout())
			if err != nil {
				return nil, fmt.Errorf("parsing hover options: %w", err)
			}
			return promise(vu, func() (any, error) {
				return nil, lo.Hover(copts) //nolint:wrapcheck
			}), nil
		},
		"tap": func(opts sobek.Value) (*sobek.Promise, error) {
			copts, err := parseFrameTapOptions(rt, opts, lo.DefaultTimeout())
			if err != nil {
				return nil, fmt.Errorf("parsing locator tap options: %w", err)
			}
			return promise(vu, func() (any, error) {
				return nil, lo.Tap(copts) //nolint:wrapcheck
			}), nil
		},
		"dispatchEvent": func(typ string, eventInit, opts sobek.Value) (*sobek.Promise, error) {
			popts, err := parseFrameDispatchEventOptions(rt, opts, lo.DefaultTimeout())
			if err != nil {
				return nil, fmt.Errorf("parsing locator dispatch event options: %w", err)
			}
			return promise(vu, func() (any, error) {
				return nil, lo.DispatchEvent(typ, exportArg(eventInit), popts) //nolint:wrapcheck
			}), nil
		},
		"waitFor": func(opts sobek.Value) (*sobek.Promise, error) {
			copts, err := parseFrameWaitForSelectorOptions(rt, opts, lo.Timeout())
			if err != nil {
				return nil, fmt.Errorf("parsing wait for options: %w", err)

View on GitHub (pinned to 8d06114777)