Material: Add alpha to coverage define

types/three/src/materials/Material.d.ts

@@ -91,7 +91,9 @@ export class Material extends EventDispatcher<{ dispose: {} }> {
     alphaTest: number;
 
     /**
-     * Enables alpha to coverage. Can only be used with MSAA-enabled rendering contexts.
+     * Enables alpha to coverage. Can only be used with MSAA-enabled rendering contexts (meaning when the renderer was
+     * created with *antialias* parameter set to `true`). Enabling this will smooth aliasing on clip plane edges and
+     * alphaTest-clipped edges.
      * @default false
      */
     alphaToCoverage: boolean;

types/three/src/renderers/webgl/WebGLProgram.d.ts

@@ -1,5 +1,4 @@
 import { WebGLRenderer } from '../WebGLRenderer.js';
-import { WebGLShader } from './WebGLShader.js';
 import { WebGLUniforms } from './WebGLUniforms.js';
 
 export class WebGLProgram {

types/three/src/renderers/webgl/WebGLPrograms.d.ts

@@ -46,6 +46,7 @@ export interface WebGLProgramParameters {
 
     supportsVertexTextures: boolean;
     outputColorSpace: ColorSpace;
+    alphaToCoverage: boolean;
 
     map: boolean;
     matcap: boolean;