Allow false as cache group value (#29354)

types/webpack/index.d.ts

@@ -601,7 +601,7 @@ declare namespace webpack {
             /** Give chunks created a name (chunks with equal name are merged) */
             name?: boolean | string | ((...args: any[]) => any);
             /** Assign modules to a cache group (modules from different cache groups are tried to keep in separate chunks) */
-            cacheGroups?: false | string | ((...args: any[]) => any) | RegExp | { [key: string]: CacheGroupsOptions };
+            cacheGroups?: false | string | ((...args: any[]) => any) | RegExp | { [key: string]: CacheGroupsOptions | false };
         }
         interface RuntimeChunkOptions {
             /** The name or name factory for the runtime chunks. */

types/webpack/webpack-tests.ts

@@ -633,6 +633,7 @@ configuration = {
     optimization: {
         splitChunks: {
             cacheGroups: {
+                default: false,
                 vendor: {
                     chunks: "initial",
                     test: "node_modules",