feat: add emit option for asset modules

crates/node_binding/binding.d.ts

@@ -580,6 +580,7 @@ export interface RawAssetGeneratorDataUrlOptions {
 }
 
 export interface RawAssetGeneratorOptions {
+  emit?: boolean
   filename?: string
   publicPath?: string
   dataUrl?: RawAssetGeneratorDataUrlOptions | ((arg: RawAssetGeneratorDataUrlFnArgs) => string)
@@ -603,6 +604,7 @@ export interface RawAssetParserOptions {
 }
 
 export interface RawAssetResourceGeneratorOptions {
+  emit?: boolean
   filename?: string
   publicPath?: string
 }

crates/rspack_binding_options/src/options/raw_module/mod.rs

@@ -520,6 +520,7 @@ impl From<RawGeneratorOptions> for GeneratorOptions {
 #[serde(rename_all = "camelCase")]
 #[napi(object, object_to_js = false)]
 pub struct RawAssetGeneratorOptions {
+  pub emit: Option<bool>,
   pub filename: Option<String>,
   pub public_path: Option<String>,
   #[derivative(Debug = "ignore")]
@@ -533,6 +534,7 @@ pub struct RawAssetGeneratorOptions {
 impl From<RawAssetGeneratorOptions> for AssetGeneratorOptions {
   fn from(value: RawAssetGeneratorOptions) -> Self {
     Self {
+      emit: value.emit,
       filename: value.filename.map(|i| i.into()),
       public_path: value.public_path.map(|i| i.into()),
       data_url: value
@@ -569,13 +571,15 @@ impl From<RawAssetInlineGeneratorOptions> for AssetInlineGeneratorOptions {
 #[serde(rename_all = "camelCase")]
 #[napi(object)]
 pub struct RawAssetResourceGeneratorOptions {
+  pub emit: Option<bool>,
   pub filename: Option<String>,
   pub public_path: Option<String>,
 }
 
 impl From<RawAssetResourceGeneratorOptions> for AssetResourceGeneratorOptions {
   fn from(value: RawAssetResourceGeneratorOptions) -> Self {
     Self {
+      emit: value.emit,
       filename: value.filename.map(|i| i.into()),
       public_path: value.public_path.map(|i| i.into()),
     }

crates/rspack_core/src/options/module.rs

@@ -253,6 +253,13 @@ impl GeneratorOptions {
           .and_then(|x| x.data_url.as_ref())
       })
   }
+
+  pub fn asset_emit(&self, module_type: &ModuleType) -> Option<bool> {
+    self
+      .get_asset(module_type)
+      .and_then(|x| x.emit)
+      .or_else(|| self.get_asset_resource(module_type).and_then(|x| x.emit))
+  }
 }
 
 #[derive(Debug, Clone, MergeFrom)]
@@ -262,12 +269,14 @@ pub struct AssetInlineGeneratorOptions {
 
 #[derive(Debug, Clone, MergeFrom)]
 pub struct AssetResourceGeneratorOptions {
+  pub emit: Option<bool>,
   pub filename: Option<Filename>,
   pub public_path: Option<PublicPath>,
 }
 
 #[derive(Debug, Clone, MergeFrom)]
 pub struct AssetGeneratorOptions {
+  pub emit: Option<bool>,
   pub filename: Option<Filename>,
   pub public_path: Option<PublicPath>,
   pub data_url: Option<AssetGeneratorDataUrl>,

crates/rspack_plugin_asset/src/lib.rs

@@ -68,34 +68,39 @@ impl CanonicalizedDataUrlOption {
 
 #[derive(Debug)]
 pub struct AssetParserAndGenerator {
+  emit: bool,
   data_url: DataUrlOptions,
   parsed_asset_config: Option<CanonicalizedDataUrlOption>,
 }
 
 impl AssetParserAndGenerator {
-  pub fn with_auto(option: Option<AssetParserDataUrl>) -> Self {
+  pub fn with_auto(option: Option<AssetParserDataUrl>, emit: bool) -> Self {
     Self {
+      emit,
       data_url: DataUrlOptions::Auto(option),
       parsed_asset_config: None,
     }
   }
 
   pub fn with_inline() -> Self {
     Self {
+      emit: false,
       data_url: DataUrlOptions::Inline(true),
       parsed_asset_config: None,
     }
   }
 
-  pub fn with_resource() -> Self {
+  pub fn with_resource(emit: bool) -> Self {
     Self {
+      emit,
       data_url: DataUrlOptions::Inline(false),
       parsed_asset_config: None,
     }
   }
 
   pub fn with_source() -> Self {
     Self {
+      emit: false,
       data_url: DataUrlOptions::Source,
       parsed_asset_config: None,
     }
@@ -210,7 +215,7 @@ const DEFAULT_MAX_SIZE: u32 = 8096;
 impl ParserAndGenerator for AssetParserAndGenerator {
   fn source_types(&self) -> &[SourceType] {
     if let Some(config) = self.parsed_asset_config.as_ref() {
-      if config.is_source() || config.is_inline() {
+      if config.is_source() || config.is_inline() || !self.emit {
         ASSET_SOURCE_MODULE_SOURCE_TYPE_LIST
       } else {
         ASSET_MODULE_SOURCE_TYPE_LIST
@@ -589,23 +594,38 @@ impl Plugin for AssetPlugin {
 
     ctx.context.register_parser_and_generator_builder(
       rspack_core::ModuleType::Asset,
-      Box::new(move |p, _| {
-        let data_url_condition = p
+      Box::new(move |parser_options, generator_options| {
+        let data_url_condition = parser_options
           .and_then(|x| x.get_asset(&ModuleType::Asset))
           .and_then(|x| x.data_url_condition.clone());
+
+        let emit: Option<bool> = generator_options
+          .and_then(|x| x.get_asset(&ModuleType::Asset))
+          .and_then(|x| x.emit);
+
         Box::new(AssetParserAndGenerator::with_auto(
           data_url_condition.clone(),
+          emit.unwrap_or(true),
         ))
       }),
     );
+
     ctx.context.register_parser_and_generator_builder(
       rspack_core::ModuleType::AssetInline,
       Box::new(|_, _| Box::new(AssetParserAndGenerator::with_inline())),
     );
+
     ctx.context.register_parser_and_generator_builder(
       rspack_core::ModuleType::AssetResource,
-      Box::new(move |_, _| Box::new(AssetParserAndGenerator::with_resource())),
+      Box::new(move |_, generator_options| {
+        let emit = generator_options
+          .and_then(|x| x.get_asset_resource(&ModuleType::AssetResource))
+          .and_then(|x| x.emit);
+
+        Box::new(AssetParserAndGenerator::with_resource(emit.unwrap_or(true)))
+      }),
     );
+
     ctx.context.register_parser_and_generator_builder(
       rspack_core::ModuleType::AssetSource,
       Box::new(move |_, _| Box::new(AssetParserAndGenerator::with_source())),

packages/rspack/etc/api.md

@@ -3363,6 +3363,7 @@ export const rspackOptions: z.ZodObject<{
                     filename: string;
                     content: string;
                 }>], z.ZodUnknown>, z.ZodString>]>>;
+                emit: z.ZodOptional<z.ZodBoolean>;
                 filename: z.ZodOptional<z.ZodString>;
                 publicPath: z.ZodOptional<z.ZodUnion<[z.ZodLiteral<"auto">, z.ZodString]>>;
             }, "strict", z.ZodTypeAny, {
@@ -3373,6 +3374,7 @@ export const rspackOptions: z.ZodObject<{
                     filename: string;
                     content: string;
                 }, ...args_1: unknown[]) => string) | undefined;
+                emit?: boolean | undefined;
                 filename?: string | undefined;
                 publicPath?: string | undefined;
             }, {
@@ -3383,6 +3385,7 @@ export const rspackOptions: z.ZodObject<{
                     filename: string;
                     content: string;
                 }, ...args_1: unknown[]) => string) | undefined;
+                emit?: boolean | undefined;
                 filename?: string | undefined;
                 publicPath?: string | undefined;
             }>>;
@@ -3424,12 +3427,15 @@ export const rspackOptions: z.ZodObject<{
                 }, ...args_1: unknown[]) => string) | undefined;
             }>>;
             "asset/resource": z.ZodOptional<z.ZodObject<{
+                emit: z.ZodOptional<z.ZodBoolean>;
                 filename: z.ZodOptional<z.ZodString>;
                 publicPath: z.ZodOptional<z.ZodUnion<[z.ZodLiteral<"auto">, z.ZodString]>>;
             }, "strict", z.ZodTypeAny, {
+                emit?: boolean | undefined;
                 filename?: string | undefined;
                 publicPath?: string | undefined;
             }, {
+                emit?: boolean | undefined;
                 filename?: string | undefined;
                 publicPath?: string | undefined;
             }>>;
@@ -3478,6 +3484,7 @@ export const rspackOptions: z.ZodObject<{
                     filename: string;
                     content: string;
                 }, ...args_1: unknown[]) => string) | undefined;
+                emit?: boolean | undefined;
                 filename?: string | undefined;
                 publicPath?: string | undefined;
             } | undefined;
@@ -3491,6 +3498,7 @@ export const rspackOptions: z.ZodObject<{
                 }, ...args_1: unknown[]) => string) | undefined;
             } | undefined;
             "asset/resource"?: {
+                emit?: boolean | undefined;
                 filename?: string | undefined;
                 publicPath?: string | undefined;
             } | undefined;
@@ -3517,6 +3525,7 @@ export const rspackOptions: z.ZodObject<{
                     filename: string;
                     content: string;
                 }, ...args_1: unknown[]) => string) | undefined;
+                emit?: boolean | undefined;
                 filename?: string | undefined;
                 publicPath?: string | undefined;
             } | undefined;
@@ -3530,6 +3539,7 @@ export const rspackOptions: z.ZodObject<{
                 }, ...args_1: unknown[]) => string) | undefined;
             } | undefined;
             "asset/resource"?: {
+                emit?: boolean | undefined;
                 filename?: string | undefined;
                 publicPath?: string | undefined;
             } | undefined;
@@ -3583,6 +3593,7 @@ export const rspackOptions: z.ZodObject<{
                     filename: string;
                     content: string;
                 }, ...args_1: unknown[]) => string) | undefined;
+                emit?: boolean | undefined;
                 filename?: string | undefined;
                 publicPath?: string | undefined;
             } | undefined;
@@ -3596,6 +3607,7 @@ export const rspackOptions: z.ZodObject<{
                 }, ...args_1: unknown[]) => string) | undefined;
             } | undefined;
             "asset/resource"?: {
+                emit?: boolean | undefined;
                 filename?: string | undefined;
                 publicPath?: string | undefined;
             } | undefined;
@@ -3649,6 +3661,7 @@ export const rspackOptions: z.ZodObject<{
                     filename: string;
                     content: string;
                 }, ...args_1: unknown[]) => string) | undefined;
+                emit?: boolean | undefined;
                 filename?: string | undefined;
                 publicPath?: string | undefined;
             } | undefined;
@@ -3662,6 +3675,7 @@ export const rspackOptions: z.ZodObject<{
                 }, ...args_1: unknown[]) => string) | undefined;
             } | undefined;
             "asset/resource"?: {
+                emit?: boolean | undefined;
                 filename?: string | undefined;
                 publicPath?: string | undefined;
             } | undefined;
@@ -4034,6 +4048,7 @@ export const rspackOptions: z.ZodObject<{
                     filename: string;
                     content: string;
                 }, ...args_1: unknown[]) => string) | undefined;
+                emit?: boolean | undefined;
                 filename?: string | undefined;
                 publicPath?: string | undefined;
             } | undefined;
@@ -4047,6 +4062,7 @@ export const rspackOptions: z.ZodObject<{
                 }, ...args_1: unknown[]) => string) | undefined;
             } | undefined;
             "asset/resource"?: {
+                emit?: boolean | undefined;
                 filename?: string | undefined;
                 publicPath?: string | undefined;
             } | undefined;
@@ -4419,6 +4435,7 @@ export const rspackOptions: z.ZodObject<{
                     filename: string;
                     content: string;
                 }, ...args_1: unknown[]) => string) | undefined;
+                emit?: boolean | undefined;
                 filename?: string | undefined;
                 publicPath?: string | undefined;
             } | undefined;
@@ -4432,6 +4449,7 @@ export const rspackOptions: z.ZodObject<{
                 }, ...args_1: unknown[]) => string) | undefined;
             } | undefined;
             "asset/resource"?: {
+                emit?: boolean | undefined;
                 filename?: string | undefined;
                 publicPath?: string | undefined;
             } | undefined;
@@ -4994,7 +5012,7 @@ export type WorkerPublicPath = z.infer<typeof workerPublicPath>;
 // dist/builtin-plugin/SwcJsMinimizerPlugin.d.ts:43:5 - (ae-forgotten-export) The symbol "ToSnakeCaseProperties" needs to be exported by the entry point index.d.ts
 // dist/builtin-plugin/SwcJsMinimizerPlugin.d.ts:45:5 - (ae-forgotten-export) The symbol "MinifyConditions" needs to be exported by the entry point index.d.ts
 // dist/config/adapterRuleUse.d.ts:145:5 - (ae-forgotten-export) The symbol "PitchLoaderDefinitionFunction" needs to be exported by the entry point index.d.ts
-// dist/config/zod.d.ts:5264:5 - (ae-forgotten-export) The symbol "oldBuiltins" needs to be exported by the entry point index.d.ts
+// dist/config/zod.d.ts:5304:5 - (ae-forgotten-export) The symbol "oldBuiltins" needs to be exported by the entry point index.d.ts
 // dist/exports.d.ts:103:5 - (ae-forgotten-export) The symbol "ContainerPlugin" needs to be exported by the entry point index.d.ts
 // dist/exports.d.ts:104:5 - (ae-forgotten-export) The symbol "ContainerReferencePlugin" needs to be exported by the entry point index.d.ts
 // dist/exports.d.ts:105:5 - (ae-forgotten-export) The symbol "ModuleFederationPlugin" needs to be exported by the entry point index.d.ts

packages/rspack/src/config/adapter.ts

@@ -717,6 +717,7 @@ function getRawAssetResourceGeneratorOptions(
 	options: AssetResourceGeneratorOptions
 ): RawAssetResourceGeneratorOptions {
 	return {
+		emit: options.emit,
 		filename: options.filename,
 		publicPath: options.publicPath
 	};

packages/rspack/src/config/zod.ts

@@ -625,6 +625,7 @@ export type AssetInlineGeneratorOptions = z.infer<
 >;
 
 const assetResourceGeneratorOptions = z.strictObject({
+	emit: z.boolean().optional(),
 	filename: filenameTemplate.optional(),
 	publicPath: publicPath.optional()
 });

packages/rspack/tests/configCases/asset/disable-emit-by-rule/index.js

@@ -0,0 +1,12 @@
+import url from "../_images/file.png";
+import url2 from "../_images/file.jpg";
+import fs from "fs";
+import path from "path";
+
+it("should not output asset when emit is false", () => {
+	expect(url).toEqual("images/file.png");
+	expect(url2).toEqual("images/file.jpg");
+
+	expect(fs.existsSync(path.join(__STATS__.outputPath, url))).toBe(false);
+	expect(fs.existsSync(path.join(__STATS__.outputPath, url2))).toBe(true);
+});

packages/rspack/tests/configCases/asset/disable-emit-by-rule/webpack.config.js

@@ -0,0 +1,22 @@
+/** @type {import("@rspack/core").Configuration} */
+module.exports = {
+	context: __dirname,
+	output: {
+		assetModuleFilename: "images/file[ext]"
+	},
+	module: {
+		rules: [
+			{
+				test: /\.png$/,
+				type: "asset/resource",
+				generator: {
+					emit: false
+				}
+			},
+			{
+				test: /\.jpg$/,
+				type: "asset/resource"
+			}
+		]
+	}
+};

packages/rspack/tests/configCases/asset/disable-emit-for-asset/index.js

@@ -0,0 +1,12 @@
+import url from "../_images/file.png";
+import url2 from "../_images/file.jpg";
+import fs from "fs";
+import path from "path";
+
+it("should not output asset when emit is false", () => {
+	expect(url).toEqual("images/file.png");
+	expect(url2).toEqual("images/file.jpg");
+
+	expect(fs.existsSync(path.join(__STATS__.outputPath, url))).toBe(false);
+	expect(fs.existsSync(path.join(__STATS__.outputPath, url2))).toBe(false);
+});