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

export default function BrushEvent(type, {
  sourceEvent,
  target,
  selection,
  mode,
  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},
    selection: {value: selection, enumerable: true, configurable: true},
    mode: {value: mode, enumerable: true, configurable: true},
    _: {value: dispatch}
  });
}