These are the types of objects returned in event callbacks. Concrete aliases (layoutEvent, pressEvent, …) are instances of SyntheticEvent / ResponderSyntheticEvent modules.

nullable<'a> below is ReScript's stdlib nullable type.

type t = {
  bubbles: nullable<bool>,
  cancelable: nullable<bool>,
  currentTarget: float,
  defaultPrevented: nullable<bool>,
  dispatchConfig: registrationName,
  eventPhase: nullable<float>,
  isTrusted: nullable<bool>,
  nativeEvent: 'payload,
  target: nullable<float>,
  timeStamp: float,
  \"type": nullable<string>,
}

Helpers such as preventDefault, stopPropagation, persist, etc. are available on the event value.

Same fields as SyntheticEvent, plus touchHistory.

nativeEvent.layout is a Layout.rectangle (x, y, width, height).

Responder event whose payload includes locationX / locationY, pageX / pageY, touches, changedTouches, etc.

Payload uses shared layout types:

type payload = {
  contentInset: Layout.insets,
  contentOffset: Layout.point,
  contentSize: Layout.size,
  layoutMeasurement: Layout.size,
}

type payload = {value: bool}

type payload = {target: int}

type payload = {
  lines: array<{
    ...Layout.rectangle,
    ascender: float,
    capHeight: float,
    descender: float,
    text: string,
    xHeight: float,
  }>,
}

W3C pointer event payload (pointerId, pointerType, coordinates, modifiers, …). See also View.pointerEventProps.

Payload: {target: float}.