sentry/static/app/utils/profiling/flamegraph/flamegraphStateProvider/reducers/flamegraphZoomPosition.tsx

import {Rect} from 'sentry/utils/profiling/gl/utils';

type FlamegraphZoomPositionAction = {
  payload: Rect;
  type: 'checkpoint';
};

type FlamegraphZoomPosition = {
  view: Rect;
};

export function flamegraphZoomPositionReducer(
  state: FlamegraphZoomPosition,
  action: FlamegraphZoomPositionAction
): FlamegraphZoomPosition {
  switch (action.type) {
    case 'checkpoint': {
      return {view: Rect.From(action.payload)};
    }
    default: {
      return state;
    }
  }
}