feat: set default SWC minimizer passes to 2 to reduce bundle size

packages/rspack-test-tools/tests/__snapshots__/StatsAPI.test.js.snap

@@ -29,7 +29,7 @@ Object {
       isOverSizeLimit: false,
       name: main.js,
       related: Array [],
-      size: 207,
+      size: 206,
       type: asset,
     },
   ],
@@ -49,7 +49,7 @@ Object {
         main.js,
       ],
       filteredModules: undefined,
-      hash: 6e63c93280ecf7f7,
+      hash: dc21001e16b79ee1,
       id: 909,
       idHints: Array [],
       initial: true,
@@ -152,10 +152,10 @@ Object {
       assets: Array [
         Object {
           name: main.js,
-          size: 207,
+          size: 206,
         },
       ],
-      assetsSize: 207,
+      assetsSize: 206,
       auxiliaryAssets: Array [],
       auxiliaryAssetsSize: 0,
       childAssets: Object {},
@@ -173,7 +173,7 @@ Object {
   errorsCount: 0,
   filteredAssets: undefined,
   filteredModules: undefined,
-  hash: fbda3282340b27ec,
+  hash: 71a1e7d194ca24f9,
   modules: Array [
     Object {
       assets: Array [],
@@ -246,10 +246,10 @@ Object {
       assets: Array [
         Object {
           name: main.js,
-          size: 207,
+          size: 206,
         },
       ],
-      assetsSize: 207,
+      assetsSize: 206,
       auxiliaryAssets: Array [],
       auxiliaryAssetsSize: 0,
       childAssets: Object {},
@@ -318,7 +318,7 @@ Object {
         main.js,
       ],
       filteredModules: undefined,
-      hash: b7792c75de914bcf,
+      hash: bf2cde18064956f4,
       id: 909,
       idHints: Array [],
       initial: true,
@@ -685,7 +685,7 @@ Object {
   errorsCount: 0,
   filteredAssets: undefined,
   filteredModules: undefined,
-  hash: f0ec7fcc2231784a,
+  hash: 8a4abcf81482ccb3,
   modules: Array [
     Object {
       assets: Array [],
@@ -1432,7 +1432,7 @@ Object {
         related: Object {},
       },
       name: main.js,
-      size: 207,
+      size: 206,
       type: asset,
     },
   ],
@@ -1449,7 +1449,7 @@ Object {
       files: Array [
         main.js,
       ],
-      hash: 6e63c93280ecf7f7,
+      hash: dc21001e16b79ee1,
       id: 909,
       idHints: Array [],
       initial: true,
@@ -1569,7 +1569,7 @@ Object {
       isOverSizeLimit: false,
       name: main.js,
       related: Array [],
-      size: 346,
+      size: 337,
       type: asset,
     },
   ],
@@ -1589,7 +1589,7 @@ Object {
         main.js,
       ],
       filteredModules: undefined,
-      hash: cb183b73192ba5e0,
+      hash: 7a2353722113f6b4,
       id: 909,
       idHints: Array [],
       initial: true,
@@ -1916,10 +1916,10 @@ exports.c = require("./c?c=3");,
       assets: Array [
         Object {
           name: main.js,
-          size: 346,
+          size: 337,
         },
       ],
-      assetsSize: 346,
+      assetsSize: 337,
       auxiliaryAssets: Array [],
       auxiliaryAssetsSize: 0,
       childAssets: Object {},
@@ -1937,7 +1937,7 @@ exports.c = require("./c?c=3");,
   errorsCount: 0,
   filteredAssets: undefined,
   filteredModules: undefined,
-  hash: 19c21d4b968cc3c3,
+  hash: bbbee3eda42d5c59,
   modules: Array [
     Object {
       assets: Array [],
@@ -2234,10 +2234,10 @@ exports.c = require("./c?c=3");,
       assets: Array [
         Object {
           name: main.js,
-          size: 346,
+          size: 337,
         },
       ],
-      assetsSize: 346,
+      assetsSize: 337,
       auxiliaryAssets: Array [],
       auxiliaryAssetsSize: 0,
       childAssets: Object {},

packages/rspack-test-tools/tests/configCases/plugins/minify-disable-minify/index.js

@@ -4,6 +4,5 @@ const path = require("path");
 it("[minify-disable-minify]: should not minify code", () => {
 	const content = fs.readFileSync(path.resolve(__dirname, "a.js"), "utf-8");
 
-	expect(content).toContain("let a = process.env.a;");
-	expect(content).toContain("console.log(a + process.env.b);");
+	expect(content).toContain("console.log(process.env.a + process.env.b);");
 });

packages/rspack-test-tools/tests/statsAPICases/basic.js

@@ -20,8 +20,8 @@ module.exports = {
 		expect(stats?.toJson(statsOptions)).toMatchSnapshot();
 		expect(stats?.toString(statsOptions)).toMatchInlineSnapshot(`
 		PublicPath: auto
-		asset main.js 207 bytes {909} [emitted] (name: main)
-		Entrypoint main 207 bytes = main.js
+		asset main.js 206 bytes {909} [emitted] (name: main)
+		Entrypoint main 206 bytes = main.js
 		chunk {909} (runtime: main) main.js (main) 55 bytes [entry] [rendered]
 		  > ./fixtures/a main
 		  ./fixtures/a.js [585] 55 bytes {909} [depth 0] [built] [code generated]
@@ -39,7 +39,7 @@ module.exports = {
 		  entry ./fixtures/a
 		  cjs self exports reference self [585] ./fixtures/a.js
 
-		Rspack compiled successfully (fbda3282340b27ec)
+		Rspack compiled successfully (71a1e7d194ca24f9)
 	`);
 	}
 };

packages/rspack-test-tools/tests/statsAPICases/child-compiler.js

@@ -68,7 +68,7 @@ module.exports = {
 		        related: Object {},
 		      },
 		      name: TestChild.js,
-		      size: 353,
+		      size: 344,
 		      type: asset,
 		    },
 		    Object {
@@ -90,7 +90,7 @@ module.exports = {
 		        related: Object {},
 		      },
 		      name: main.js,
-		      size: 207,
+		      size: 206,
 		      type: asset,
 		    },
 		  ],
@@ -120,7 +120,7 @@ module.exports = {
 		            related: Object {},
 		          },
 		          name: TestChild.js,
-		          size: 353,
+		          size: 344,
 		          type: asset,
 		        },
 		      ],

packages/rspack-test-tools/tests/statsAPICases/chunks.js

@@ -27,7 +27,7 @@ module.exports = {
 		      chunkB.js,
 		    ],
 		    filteredModules: undefined,
-		    hash: cea3fd1b25a4eb4d,
+		    hash: 64feb0c0aec6d474,
 		    id: 250,
 		    idHints: Array [],
 		    initial: false,
@@ -144,7 +144,7 @@ module.exports = {
 		      main.js,
 		    ],
 		    filteredModules: undefined,
-		    hash: cebfd5f70fd80ce4,
+		    hash: ecb98ed10bf9b94d,
 		    id: 909,
 		    idHints: Array [],
 		    initial: true,

packages/rspack-test-tools/tests/statsAPICases/ids.js

@@ -17,7 +17,7 @@ module.exports = {
 		};
 		expect(stats?.toJson(options)).toMatchSnapshot();
 		expect(stats?.toString(options)).toMatchInlineSnapshot(`
-		asset main.js 207 bytes {909} [emitted] (name: main)
+		asset main.js 206 bytes {909} [emitted] (name: main)
 		chunk {909} (runtime: main) main.js (main) 55 bytes [entry] [rendered]
 		./fixtures/a.js [585] 55 bytes {909} [built] [code generated]
 	`);

packages/rspack-test-tools/tests/statsAPICases/to-string.js

@@ -10,7 +10,7 @@ module.exports = {
 	async check(stats) {
 		expect(stats?.toString({ timings: false, version: false }))
 			.toMatchInlineSnapshot(`
-		asset main.js 353 bytes [emitted] (name: main)
+		asset main.js 344 bytes [emitted] (name: main)
 		./fixtures/abc.js 83 bytes [built] [code generated]
 		./fixtures/a.js 55 bytes [built] [code generated]
 		./fixtures/b.js 94 bytes [built] [code generated]

packages/rspack/src/builtin-plugin/SwcJsMinimizerPlugin.ts

@@ -277,14 +277,16 @@ export const SwcJsMinimizerRspackPlugin = create(
 			...options?.minimizerOptions?.format
 		};
 
+		// terser defaults to 1, SWC defaults to 3
+		// Rspack uses 2 to balance the build performance and the bundle size
 		if (compress && typeof compress === "object") {
 			compress = {
-				passes: 1, // terser and swc use different default value: 0
+				passes: 2,
 				...compress
 			};
 		} else if (compress) {
 			compress = {
-				passes: 1
+				passes: 2
 			};
 		}
 

tests/webpack-test/__snapshots__/StatsTestCases.basictest.js.snap

@@ -269,7 +269,7 @@ Rspack x.x.x compiled <CLR=32,BOLD>successfully</CLR> in X s"
 `;
 
 exports[`StatsTestCases should print correct stats for common-libs 1`] = `
-"asset react.js 3.76 KiB [emitted] (name: react)
+"asset react.js 2.08 KiB [emitted] (name: react)
 ./react.js 74 bytes [built] [code generated]
 ../../../../node_modules/.pnpm/[email protected]/node_modules/react/index.js 190 bytes [built] [code generated]
 ../../../../node_modules/.pnpm/[email protected]/node_modules/react/cjs/react.production.min.js 6.77 KiB [built] [code generated]

website/docs/en/plugins/rspack/swc-js-minimizer-rspack-plugin.mdx

@@ -160,7 +160,7 @@ const defaultOptions = {
   minify: true,
   mangle: true,
   compress: {
-    passes: 1,
+    passes: 2,
   }
   format: {
     comments: false,
@@ -179,3 +179,15 @@ new rspack.SwcJsMinimizerRspackPlugin({
   },
 });
 ```
+
+For example, set a higher `passes` to run more compression passes. In some cases this may result in a smaller bundle size, but the more passes that are run, the more time it takes to compress.
+
+```js
+new rspack.SwcJsMinimizerRspackPlugin({
+  minimizerOptions: {
+    compress: {
+      passes: 4,
+    },
+  },
+});
+```

website/docs/zh/plugins/rspack/swc-js-minimizer-rspack-plugin.mdx

@@ -160,7 +160,7 @@ const defaultOptions = {
   minify: true,
   mangle: true,
   compress: {
-    passes: 1,
+    passes: 2,
   }
   format: {
     comments: false,
@@ -179,3 +179,15 @@ new rspack.SwcJsMinimizerRspackPlugin({
   },
 });
 ```
+
+例如，设置更高的 `passes` 来运行更多的压缩次数。在一些情况下，这可能会输出更小的包体积，但执行次数越多，压缩需要的时间就越长。
+
+```js
+new rspack.SwcJsMinimizerRspackPlugin({
+  minimizerOptions: {
+    compress: {
+      passes: 4,
+    },
+  },
+});
+```