Initial project import

node_modules/three-stdlib/csm/CSMHelper.d.ts

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+import {
+  Box3Helper,
+  BufferGeometry,
+  Group,
+  LineBasicMaterial,
+  LineSegments,
+  Mesh,
+  MeshBasicMaterial,
+  PlaneGeometry,
+} from 'three'
+
+import { CSM } from './CSM'
+
+export class CSMHelper<TCSM extends CSM = CSM> extends Group {
+  constructor(csm: TCSM)
+  csm: TCSM
+  displayFrustum: boolean
+  displayPlanes: boolean
+  displayShadowBounds: boolean
+  frustumLines: LineSegments<BufferGeometry, LineBasicMaterial>
+  cascadeLines: Box3Helper[]
+  cascadePlanes: Array<Mesh<PlaneGeometry, MeshBasicMaterial>>
+  shadowLines: Box3Helper[]
+  updateVisibility(): void
+  update(): void
+}