feat(core): faster transpiler option - siteConfig.future.experimental_faster.swcJsLoader (#10435)

packages/docusaurus-faster/src/index.ts

@@ -0,0 +1,35 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import type {RuleSetRule} from 'webpack';
+
+export function getSwcJsLoaderFactory({
+  isServer,
+}: {
+  isServer: boolean;
+}): RuleSetRule {
+  return {
+    loader: require.resolve('swc-loader'),
+    options: {
+      jsc: {
+        parser: {
+          syntax: 'typescript',
+          tsx: true,
+        },
+        transform: {
+          react: {
+            runtime: 'automatic',
+          },
+        },
+        target: 'es2017',
+      },
+      module: {
+        type: isServer ? 'commonjs' : 'es6',
+      },
+    },
+  };
+}