ui/node_modules/d3-zoom/src/event.js

export default function ZoomEvent(type, {
  sourceEvent,
  target,
  transform,
  dispatch
}) {
  Object.defineProperties(this, {
    type: {value: type, enumerable: true, configurable: true},
    sourceEvent: {value: sourceEvent, enumerable: true, configurable: true},
    target: {value: target, enumerable: true, configurable: true},
    transform: {value: transform, enumerable: true, configurable: true},
    _: {value: dispatch}
  });
}