export * as bar from 'foo'export { default as bar } from 'foo'
export * as ECharts from 'echarts/lib/echarts.js'
export { default as ECharts } from'echarts
假设我有:final case class TextData() extends Datafinal case class MetaData[D <: Data](data: D) extends Datadef getDataTypeName(data: Data): String ={ case TextData()=>"text"