fix(pointer): use 0.5 as default value for PointerEvent.pressure (#1262)

Co-authored-by: Philipp Fritsche <[email protected]>

Author: snowystinger

src/event/createEvent.ts

@@ -256,13 +256,14 @@ function initPointerEvent(
     twist,
     pointerType,
     isPrimary,
+    buttons,
   }: PointerEventInit,
 ) {
   assignProps(event, {
     pointerId: sanitizeNumber(pointerId),
     width: sanitizeNumber(width ?? 1),
     height: sanitizeNumber(height ?? 1),
-    pressure: sanitizeNumber(pressure),
+    pressure: sanitizeNumber(pressure ?? (buttons ? 0.5 : 0)),
     tangentialPressure: sanitizeNumber(tangentialPressure),
     tiltX: sanitizeNumber(tiltX),
     tiltY: sanitizeNumber(tiltY),

tests/pointer/index.ts

@@ -267,3 +267,24 @@ test('suppress mouse events per preventDefault on pointerdown', async () => {
   expect(eventWasFired('mousemove')).toBe(false)
   expect(eventWasFired('mouseup')).toBe(false)
 })
+
+test('apply default event properties', async () => {
+  const {element, user, getEvents, clearEventCalls} = setup(`<div></div>`)
+
+  await user.pointer({target: element})
+
+  expect(getEvents('pointermove')[0]).toEqual(expect.objectContaining({
+    width: 1,
+    height: 1,
+    pressure: 0,
+  }))
+
+  clearEventCalls()
+  await user.pointer([{keys: '[MouseLeft>]'}, {coords: {x: 20}}])
+
+  expect(getEvents('pointermove')[0]).toEqual(expect.objectContaining({
+    width: 1,
+    height: 1,
+    pressure: 0.5,
+  }))
+})