usePinch receives duplicate events on Safari

[andthom]

Describe the bug

Every usePinch event seems to fire at least twice on Safari.

Example

  usePinch(
    (state) => {
      const { timeStamp } =
        state;
      console.log(timeStamp);
    },
    {
      target: yourTargetHere
    }
  );

...
return (
  <div
      ref={yourTargetHere}
      style={{ position: 'relative', touchAction: 'none' }}
    >
My component is in here.
  </div>
);

yields the following on Safari:

[Log] 4983.000000000001
[Log] 4983.000000000001
[Log] 4987
[Log] 4987
[Log] 4991.000000000001 
[Log] 4991.000000000001 
...

and the following on other browsers:

Firefox:
6836
6841
6844
6848

Chrome:
5586.60000000149
5594.89999999851
5607.39999999851
5611.5

Information:

• Use Gesture version: @use-gesture/react@10.3.1
• Device (OS): Macbook Pro 2016 (Monterey 12.7) and Macbook Pro 2023 (Sonoma 14.4)
• Browser: Safari

Checklist:

• I've read the documentation.
• If this is an issue with drag, I've tried setting touch-action: none to the draggable element.

[andthom]

For posterity, here's how I've been coping. It's a bit janky. Admittedly, I could be foolish for not trusting it only ever to happen twice (returning timeStamp and comparing it to memo is the one-liner solution.)

Lmk if you have any ideas or, if it turns out this is by design, the proper way of dealing with it.

  const timestampSetRef = useRef<Set<number>>(new Set());

  const isRepeat = (n: number) => {
    const isRe = timestampSetRef.current.has(n);

    // Update the set manually
    timestampSetRef.current.add(n);

    // If the set exceeds 16 elements, remove the oldest one
    if (timestampSetRef.current.size > 16) {
      // Convert to an array, shift, and recreate the set
      timestampSetRef.current = new Set([...timestampSetRef.current].slice(1));
    }

    return isRe;
  };

Then in the handler:

  usePinch(
    (state) => {
      const { timeStamp } =
        state;

      if (isRepeat(timeStamp)) {
        return;
      }

      console.log(timeStamp + ' no more repeats.);
    },
    {
      target: yourTargetHere
    }
  );

Yields:

[Log] 890651.0000000001 no more repeats.
[Log] 890655 no more repeats.
[Log] 890663 no more repeats.
[Log] 890672 no more repeats.