perf: use native fetch for node >= 18 to reduce %40 of bundle size (

#1724)

src/options.ts

@@ -3,15 +3,12 @@ import { loadConfig, watchConfig, WatchConfigOptions } from "c12";
 import { klona } from "klona/full";
 import { camelCase } from "scule";
 import { defu } from "defu";
-import {
-  resolveModuleExportNames,
-  resolvePath as resolveModule,
-  parseNodeModulePath,
-} from "mlly";
+import { resolveModuleExportNames } from "mlly";
 import escapeRE from "escape-string-regexp";
 import { withLeadingSlash, withoutTrailingSlash, withTrailingSlash } from "ufo";
-import { isTest, isDebug } from "std-env";
+import { isTest, isDebug, nodeMajorVersion, provider } from "std-env";
 import { findWorkspaceDir } from "pkg-types";
+import consola from "consola";
 import {
   resolvePath,
   resolveFile,
@@ -378,6 +375,23 @@ export async function loadOptions(
     });
   }
 
+  // Native fetch
+  if (options.experimental.nodeFetchCompat === undefined) {
+    options.experimental.nodeFetchCompat = nodeMajorVersion < 18;
+    if (options.experimental.nodeFetchCompat && provider !== "stackblitz") {
+      consola.warn(
+        "Node fetch compatibility is enabled. Please consider upgrading to Node.js >= 18."
+      );
+    }
+  }
+  if (!options.experimental.nodeFetchCompat) {
+    options.alias = {
+      "node-fetch-native/polyfill": "unenv/runtime/mock/empty",
+      "node-fetch-native": "node-fetch-native/native",
+      ...options.alias,
+    };
+  }
+
   return options;
 }
 

src/types/nitro.ts

@@ -256,6 +256,10 @@ export interface NitroOptions extends PresetOptions {
      * Disable Experimental Sourcemap Minification
      */
     sourcemapMinify?: false;
+    /**
+     * Backward compatibility support for Node fetch (required for Node < 18)
+     */
+    nodeFetchCompat?: boolean;
   };
   future: {
     nativeSWR: boolean;