feat: splitChunks.cacheGroups.filename supports function

crates/node_binding/binding.d.ts

@@ -1176,7 +1176,7 @@ export interface RawCacheGroupOptions {
   key: string
   priority?: number
   test?: RegExp | string | Function
-  filename?: string
+  filename?: JsFilename
   idHint?: string
   /** What kind of chunks should be selected. */
   chunks?: RegExp | 'async' | 'initial' | 'all'

crates/rspack_binding_values/src/raw_options/raw_split_chunks/mod.rs

@@ -10,6 +10,7 @@ use napi::{Either, JsString};
 use napi_derive::napi;
 use raw_split_chunk_name::normalize_raw_chunk_name;
 use raw_split_chunk_name::RawChunkOptionName;
+use rspack_binding_values::JsFilename;
 use rspack_core::Filename;
 use rspack_core::SourceType;
 use rspack_core::DEFAULT_DELIMITER;
@@ -63,7 +64,7 @@ pub struct RawCacheGroupOptions {
   #[napi(ts_type = "RegExp | string | Function")]
   #[debug(skip)]
   pub test: Option<RawCacheGroupTest>,
-  pub filename: Option<String>,
+  pub filename: Option<JsFilename>,
   //   pub enforce: bool,
   pub id_hint: Option<String>,
   /// What kind of chunks should be selected.

packages/rspack-test-tools/tests/configCases/split-chunks/custom-filename-function/a.js

@@ -0,0 +1,24 @@
+import "./shared1";
+import "./common1";
+
+it("should be able to load the split chunk on demand (shared)", () => {
+	return import(/* webpackChunkName: "theName" */ "./shared2");
+});
+
+it("should be able to load the split chunk on demand (common)", () => {
+	return Promise.all([
+		import(/* webpackChunkName: "otherName1" */ "./common2"),
+		import(/* webpackChunkName: "otherName2" */ "./common3")
+	]);
+});
+
+it("should have files", () => {
+	const files = require("fs").readdirSync(__dirname);
+	expect(files).toContain("a.js");
+	expect(files).toContain("b.js");
+	expect(files).toContain("common-common1_js.js");
+	expect(files).toContain("common-common2_js.js");
+	expect(files).toContain("common-common3_js.js");
+	expect(files).toContain("shared-shared-shared1_js.js");
+	expect(files).toContain("shared-shared-shared2_js.js");
+});

packages/rspack-test-tools/tests/configCases/split-chunks/custom-filename-function/b.js

@@ -0,0 +1,5 @@
+import "./shared1";
+import "./shared2";
+import "./common1";
+import "./common2";
+import "./common3";

packages/rspack-test-tools/tests/configCases/split-chunks/custom-filename-function/rspack.config.js

@@ -0,0 +1,34 @@
+/** @type {import("@rspack/core").Configuration} */
+module.exports = {
+	mode: "development",
+	entry: {
+		a: "./a",
+		b: "./b"
+	},
+	output: {
+		filename: "[name].js",
+		libraryTarget: "commonjs2"
+	},
+	optimization: {
+		chunkIds: "named",
+		splitChunks: {
+			cacheGroups: {
+				shared: {
+					chunks: "all",
+					test: /shared/,
+					filename: (pathData, assetInfo) => {
+						expect(pathData).toBeDefined()
+						expect(typeof assetInfo).toBe('object')
+						return "shared-[name].js"
+					},
+					enforce: true
+				},
+				common: {
+					chunks: "all",
+					test: /common/,
+					enforce: true
+				}
+			}
+		}
+	}
+};

packages/rspack-test-tools/tests/configCases/split-chunks/custom-filename-function/test.config.js

@@ -0,0 +1,6 @@
+/** @type {import("../../../..").TConfigCaseConfig} */
+module.exports = {
+	findBundle: function (i, options) {
+		return ["a.js"];
+	}
+};

packages/rspack/etc/core.api.md

@@ -4131,7 +4131,7 @@ export type OptimizationSplitChunksCacheGroup = {
     test?: string | RegExp | ((module: Module) => unknown);
     priority?: number;
     enforce?: boolean;
-    filename?: string;
+    filename?: Filename;
     reuseExistingChunk?: boolean;
     type?: string | RegExp;
     idHint?: string;
@@ -6973,14 +6973,14 @@ export const rspackOptions: z.ZodObject<{
                 test: z.ZodOptional<z.ZodUnion<[z.ZodUnion<[z.ZodString, z.ZodType<RegExp, z.ZodTypeDef, RegExp>]>, z.ZodFunction<z.ZodTuple<[z.ZodType<Module, z.ZodTypeDef, Module>], z.ZodUnknown>, z.ZodUnknown>]>>;
                 priority: z.ZodOptional<z.ZodNumber>;
                 enforce: z.ZodOptional<z.ZodBoolean>;
-                filename: z.ZodOptional<z.ZodString>;
+                filename: z.ZodOptional<z.ZodUnion<[z.ZodString, z.ZodFunction<z.ZodTuple<[z.ZodType<PathData, z.ZodTypeDef, PathData>, z.ZodOptional<z.ZodType<JsAssetInfo, z.ZodTypeDef, JsAssetInfo>>], z.ZodUnknown>, z.ZodString>]>>;
                 reuseExistingChunk: z.ZodOptional<z.ZodBoolean>;
                 type: z.ZodOptional<z.ZodUnion<[z.ZodString, z.ZodType<RegExp, z.ZodTypeDef, RegExp>]>>;
                 idHint: z.ZodOptional<z.ZodString>;
             }, "strict", z.ZodTypeAny, {
                 name?: string | false | ((args_0: Module | undefined, ...args: unknown[]) => unknown) | undefined;
                 type?: string | RegExp | undefined;
-                filename?: string | undefined;
+                filename?: string | ((args_0: PathData, args_1: JsAssetInfo | undefined, ...args: unknown[]) => string) | undefined;
                 chunks?: RegExp | "initial" | "async" | "all" | ((args_0: Chunk, ...args: unknown[]) => boolean) | undefined;
                 usedExports?: boolean | undefined;
                 defaultSizeTypes?: string[] | undefined;
@@ -7000,7 +7000,7 @@ export const rspackOptions: z.ZodObject<{
             }, {
                 name?: string | false | ((args_0: Module | undefined, ...args: unknown[]) => unknown) | undefined;
                 type?: string | RegExp | undefined;
-                filename?: string | undefined;
+                filename?: string | ((args_0: PathData, args_1: JsAssetInfo | undefined, ...args: unknown[]) => string) | undefined;
                 chunks?: RegExp | "initial" | "async" | "all" | ((args_0: Chunk, ...args: unknown[]) => boolean) | undefined;
                 usedExports?: boolean | undefined;
                 defaultSizeTypes?: string[] | undefined;
@@ -7049,7 +7049,7 @@ export const rspackOptions: z.ZodObject<{
             cacheGroups?: Record<string, false | {
                 name?: string | false | ((args_0: Module | undefined, ...args: unknown[]) => unknown) | undefined;
                 type?: string | RegExp | undefined;
-                filename?: string | undefined;
+                filename?: string | ((args_0: PathData, args_1: JsAssetInfo | undefined, ...args: unknown[]) => string) | undefined;
                 chunks?: RegExp | "initial" | "async" | "all" | ((args_0: Chunk, ...args: unknown[]) => boolean) | undefined;
                 usedExports?: boolean | undefined;
                 defaultSizeTypes?: string[] | undefined;
@@ -7092,7 +7092,7 @@ export const rspackOptions: z.ZodObject<{
             cacheGroups?: Record<string, false | {
                 name?: string | false | ((args_0: Module | undefined, ...args: unknown[]) => unknown) | undefined;
                 type?: string | RegExp | undefined;
-                filename?: string | undefined;
+                filename?: string | ((args_0: PathData, args_1: JsAssetInfo | undefined, ...args: unknown[]) => string) | undefined;
                 chunks?: RegExp | "initial" | "async" | "all" | ((args_0: Chunk, ...args: unknown[]) => boolean) | undefined;
                 usedExports?: boolean | undefined;
                 defaultSizeTypes?: string[] | undefined;
@@ -7167,7 +7167,7 @@ export const rspackOptions: z.ZodObject<{
             cacheGroups?: Record<string, false | {
                 name?: string | false | ((args_0: Module | undefined, ...args: unknown[]) => unknown) | undefined;
                 type?: string | RegExp | undefined;
-                filename?: string | undefined;
+                filename?: string | ((args_0: PathData, args_1: JsAssetInfo | undefined, ...args: unknown[]) => string) | undefined;
                 chunks?: RegExp | "initial" | "async" | "all" | ((args_0: Chunk, ...args: unknown[]) => boolean) | undefined;
                 usedExports?: boolean | undefined;
                 defaultSizeTypes?: string[] | undefined;
@@ -7233,7 +7233,7 @@ export const rspackOptions: z.ZodObject<{
             cacheGroups?: Record<string, false | {
                 name?: string | false | ((args_0: Module | undefined, ...args: unknown[]) => unknown) | undefined;
                 type?: string | RegExp | undefined;
-                filename?: string | undefined;
+                filename?: string | ((args_0: PathData, args_1: JsAssetInfo | undefined, ...args: unknown[]) => string) | undefined;
                 chunks?: RegExp | "initial" | "async" | "all" | ((args_0: Chunk, ...args: unknown[]) => boolean) | undefined;
                 usedExports?: boolean | undefined;
                 defaultSizeTypes?: string[] | undefined;
@@ -8669,7 +8669,7 @@ export const rspackOptions: z.ZodObject<{
             cacheGroups?: Record<string, false | {
                 name?: string | false | ((args_0: Module | undefined, ...args: unknown[]) => unknown) | undefined;
                 type?: string | RegExp | undefined;
-                filename?: string | undefined;
+                filename?: string | ((args_0: PathData, args_1: JsAssetInfo | undefined, ...args: unknown[]) => string) | undefined;
                 chunks?: RegExp | "initial" | "async" | "all" | ((args_0: Chunk, ...args: unknown[]) => boolean) | undefined;
                 usedExports?: boolean | undefined;
                 defaultSizeTypes?: string[] | undefined;
@@ -9271,7 +9271,7 @@ export const rspackOptions: z.ZodObject<{
             cacheGroups?: Record<string, false | {
                 name?: string | false | ((args_0: Module | undefined, ...args: unknown[]) => unknown) | undefined;
                 type?: string | RegExp | undefined;
-                filename?: string | undefined;
+                filename?: string | ((args_0: PathData, args_1: JsAssetInfo | undefined, ...args: unknown[]) => string) | undefined;
                 chunks?: RegExp | "initial" | "async" | "all" | ((args_0: Chunk, ...args: unknown[]) => boolean) | undefined;
                 usedExports?: boolean | undefined;
                 defaultSizeTypes?: string[] | undefined;

packages/rspack/src/config/types.ts

@@ -2165,7 +2165,7 @@ export type OptimizationSplitChunksCacheGroup = {
 	enforce?: boolean;
 
 	/** Allows to override the filename when and only when it's an initial chunk. */
-	filename?: string;
+	filename?: Filename;
 
 	/**
 	 * Whether to reuse existing chunks when possible.

packages/rspack/src/config/zod.ts

@@ -1218,7 +1218,7 @@ const optimizationSplitChunksCacheGroup = z.strictObject({
 		.optional(),
 	priority: z.number().optional(),
 	enforce: z.boolean().optional(),
-	filename: z.string().optional(),
+	filename: filename.optional(),
 	reuseExistingChunk: z.boolean().optional(),
 	type: z.string().or(z.instanceof(RegExp)).optional(),
 	idHint: z.string().optional(),

website/docs/en/plugins/webpack/split-chunks-plugin.mdx

@@ -325,7 +325,7 @@ Sets the hint for chunk id. It will be added to chunk's filename.
 
 #### splitChunks.cacheGroups.\{cacheGroup\}.filename
 
-- **Type:** `string`
+- **Type:** `string | function`
 
 Allows to override the filename when and only when it's an initial chunk. All placeholders available in output.filename are also available here.
 
@@ -337,6 +337,10 @@ module.exports = {
       cacheGroups: {
         defaultVendors: {
           filename: 'vendors-[name].js',
+          // or
+          filename: (pathData, assetInfo) => {
+            return `${pathData.chunk.name}-bundle.js`;
+          },
         },
       },
     },

website/docs/zh/plugins/webpack/split-chunks-plugin.mdx

@@ -315,7 +315,7 @@ module.exports = {
 
 #### splitChunks.cacheGroups.\{cacheGroup\}.filename
 
-- **类型：** `string`
+- **类型：** `string | function`
 
 仅在初始 chunk 时才允许覆盖文件名。 也可以在 output.filename 中使用所有占位符。
 
@@ -327,6 +327,10 @@ module.exports = {
       cacheGroups: {
         defaultVendors: {
           filename: 'vendors-[name].js',
+          // or
+          filename: (pathData, assetInfo) => {
+            return `${pathData.chunk.name}-bundle.js`;
+          },
         },
       },
     },