feat(core): faster JS minimizer - siteConfig.future.experimental_faster.swcJsMinimizer (#10441)

packages/docusaurus-faster/src/index.ts

@@ -6,6 +6,7 @@
  */
 
 import type {RuleSetRule} from 'webpack';
+import type {JsMinifyOptions} from '@swc/core';
 
 export function getSwcJsLoaderFactory({
   isServer,
@@ -33,3 +34,24 @@ export function getSwcJsLoaderFactory({
     },
   };
 }
+
+// Note: these options are similar to what we use in core
+// They should rather be kept in sync for now to avoid any unexpected behavior
+// The goal of faster minifier is not to fine-tune options but only to be faster
+// See core minification.ts
+export function getSwcJsMinifierOptions(): JsMinifyOptions {
+  return {
+    ecma: 2020,
+    compress: {
+      ecma: 5,
+    },
+    module: true,
+    mangle: true,
+    safari10: true,
+    format: {
+      ecma: 5,
+      comments: false,
+      ascii_only: true,
+    },
+  };
+}