Normalize CSM imports (#21566)

examples/jsm/csm/CSM.js

@@ -7,8 +7,8 @@ import {
 	Matrix4,
 	Box3
 } from '../../../build/three.module.js';
-import Frustum from './Frustum.js';
-import Shader from './Shader.js';
+import { Frustum } from './Frustum.js';
+import { CSMShader } from './CSMShader.js';
 
 const _cameraToLightMatrix = new Matrix4();
 const _lightSpaceFrustum = new Frustum();
@@ -239,8 +239,8 @@ export class CSM {
 
 	injectInclude() {
 
-		ShaderChunk.lights_fragment_begin = Shader.lights_fragment_begin;
-		ShaderChunk.lights_pars_begin = Shader.lights_pars_begin;
+		ShaderChunk.lights_fragment_begin = CSMShader.lights_fragment_begin;
+		ShaderChunk.lights_pars_begin = CSMShader.lights_pars_begin;
 
 	}
 

examples/jsm/csm/Shader.js → examples/jsm/csm/CSMShader.js

 import { ShaderChunk } from '../../../build/three.module.js';
 
-export default {
+const CSMShader = {
 	lights_fragment_begin: /* glsl */`
 GeometricContext geometry;
 
@@ -231,3 +231,5 @@ uniform float shadowFar;
 #endif
 	` + ShaderChunk.lights_pars_begin
 };
+
+export { CSMShader };

examples/jsm/csm/Frustum.js

@@ -2,7 +2,7 @@ import { Vector3, Matrix4 } from '../../../build/three.module.js';
 
 const inverseProjectionMatrix = new Matrix4();
 
-export default class Frustum {
+class Frustum {
 
 	constructor( data ) {
 
@@ -148,3 +148,5 @@ export default class Frustum {
 	}
 
 }
+
+export { Frustum };