title Type – LineLayerFlags

type LineLayerFlags = {
  sides?: number,
  shaded?: boolean,
  join?: "tangent" | "miter" | "round" | "bevel",
} &
Pick<Partial<PipelineOptions>,
 | "mode" | "shadow" | "alphaToCoverage" | "alphaToDiscard" | "depthTest" | "depthWrite" | "blend">

Source

packages / workbench / src / layers / line-layer.ts