@antv/g2/src/runtime/constant.ts

the Grammar of Graphics in Javascript

export const MAIN_LAYER_CLASS_NAME = 'main-layer';
export const LABEL_LAYER_CLASS_NAME = 'label-layer';
export const ELEMENT_CLASS_NAME = 'element';
export const VIEW_CLASS_NAME = 'view';
export const PLOT_CLASS_NAME = 'plot';
export const COMPONENT_CLASS_NAME = 'component';
export const LABEL_CLASS_NAME = 'label';
export const AREA_CLASS_NAME = 'area';
export const MASK_CLASS_NAME = 'mask';