alignToContainerXLayout: Layouter = (layout, containerFrame) => {
  return layout.map(layoutInfo => ({
    ...layoutInfo,
    frame: {
      origin: {
        x: containerFrame.origin.x,
        y: layoutInfo.frame.origin.y,
      },
      size: layoutInfo.frame.size,
    },
  }));
}
A layouter that aligns all frames' lefts to the container frame's left.