diff --git a/vnext/rn-cli.config.js b/vnext/rn-cli.config.js
index 7b78e28723c..7c3a8500272 100644
--- a/vnext/rn-cli.config.js
+++ b/vnext/rn-cli.config.js
@@ -56,5 +56,10 @@ if (fs.existsSync(path.resolve(__dirname, '../../scripts/metro-resources.js')))
 config.resolver.extraNodeModules['SnapshotViewIOS'] = path.resolve(__dirname, 'Libraries/RCTTest/SnapshotViewIOS');
 config.resolver.hasteImplModulePath = path.resolve(__dirname, 'jest/hasteImpl.js');
 
+// Check that we have built our JS files before running the bundler, otherwise we'll get a harder to diagnose "Unable to resolve module" error
+if (!fs.existsSync(path.resolve(__dirname, 'lib/Libraries/Components/AccessibilityInfo/AccessibilityInfo.uwp.js'))) {
+  throw new Error(`\nThis package must be built before running the bundler.  Did you mean to run "yarn build" first?\n`);
+}
+
 module.exports = config;