[expo-updates] Attempt fix for reported issue in 0.63 when bundling m…

…anifest

- #9372 (comment)
- I was unable to reproduce it but if the reported cause is correct then this
  should resolve it.

packages/expo-updates/scripts/create-manifest-ios.sh

@@ -8,7 +8,8 @@ RCT_METRO_PORT=${RCT_METRO_PORT:=8081}
 NODE_BINARY=${NODE_BINARY:-node}
 
 # Related to: https://github.com/facebook/react-native/blob/c9f869f9c7c8b035a669980382af4bbd4afecb89/scripts/react-native-xcode.sh#L59-L69
-PROJECT_ROOT=${PROJECT_ROOT:-$PWD/..}
+PROJECT_ROOT=${PROJECT_ROOT:-$PWD}
+cd "$PROJECT_ROOT" || exit
 
 if ! [ -x "$(command -v $NODE_BINARY)" ]; then
   echo 'Error: cannot find the node binary. Try setting the NODE_BINARY variable in the ' \

packages/expo-updates/scripts/createManifest.js

@@ -1,18 +1,28 @@
+const { loadAsync } = require('@expo/metro-config');
 const fs = require('fs');
+const Server = require('metro/src/Server');
 const path = require('path');
 const uuid = require('uuid/v4');
 
-const fetchAssetManifestAsync = require('./fetchAssetManifestAsync');
 const filterPlatformAssetScales = require('./filterPlatformAssetScales');
 
-const platform = process.argv[2];
-const projectRoot = process.argv[3];
-const destinationDir = process.argv[4];
-
 (async function() {
+  const platform = process.argv[2];
+  const possibleProjectRoot = process.argv[3];
+  const destinationDir = process.argv[4];
+  const entryFile = process.env.ENTRY_FILE || 'index.js';
+
+  // Remove projectRoot validation when we no longer support React Native <= 62
+  let projectRoot;
+  if (fs.existsSync(path.join(possibleProjectRoot, entryFile))) {
+    projectRoot = possibleProjectRoot;
+  } else if (fs.existsSync(path.join(possibleProjectRoot, '..', entryFile))) {
+    projectRoot = path.resolve(possibleProjectRoot, '..');
+  }
+
   let assets;
   try {
-    assets = await fetchAssetManifestAsync(platform, projectRoot);
+    assets = await fetchAssetManifestAsync(platform, projectRoot, entryFile);
   } catch (e) {
     throw new Error(
       "Error loading assets JSON from Metro. Ensure you've followed all expo-updates installation steps correctly. " +
@@ -89,3 +99,39 @@ function getBasePath(asset) {
   }
   return basePath;
 }
+
+// Spawn a Metro server to get the asset manifest
+async function fetchAssetManifestAsync(platform, projectRoot, entryFile) {
+  // Project-level babel config does not load unless we change to the
+  // projectRoot before instantiating the server
+  process.chdir(projectRoot);
+
+  const config = await loadAsync(projectRoot);
+  const server = new Server(config);
+
+  const requestOpts = {
+    entryFile,
+    dev: false,
+    minify: false,
+    platform,
+  };
+
+  let assetManifest;
+  let error;
+  try {
+    assetManifest = await server.getAssets({
+      ...Server.DEFAULT_BUNDLE_OPTIONS,
+      ...requestOpts,
+    });
+  } catch (e) {
+    error = e;
+  } finally {
+    server.end();
+  }
+
+  if (error) {
+    throw error;
+  }
+
+  return assetManifest;
+}