Don't attempt to use find crawler on Windows

Summary:
This replicates the [hotfix](3703019) released in 0.73.7, to address an issue whereby Metro would fail to crawl files on Windows for non-Watchman MinGW users.

A more substantial fix should follow - IMO, we should remove this `find` crawler completely unless it's more performant in some circumstance. This diff just brings in the quick, least-intrusive fix to get `main` up to parity with `0.73.x`.

Closes: #914

Reviewed By: huntie

Differential Revision: D42371016

fbshipit-source-id: 3bd9c5e5bd42245ada39b314ac2c6301ca4315f4

packages/metro-file-map/src/crawlers/node/index.js

@@ -17,6 +17,7 @@ import H from '../../constants';
 import * as fastPath from '../../lib/fast_path';
 import {spawn} from 'child_process';
 import * as fs from 'graceful-fs';
+import {platform} from 'os';
 import * as path from 'path';
 
 const debug = require('debug')('Metro:NodeCrawler');
@@ -177,7 +178,9 @@ module.exports = async function nodeCrawl(options: CrawlerOptions): Promise<{
   } = options;
   perfLogger?.point('nodeCrawl_start');
   const useNativeFind =
-    !forceNodeFilesystemAPI && (await hasNativeFindSupport());
+    !forceNodeFilesystemAPI &&
+    platform() !== 'win32' &&
+    (await hasNativeFindSupport());
 
   debug('Using system find: %s', useNativeFind);