diff --git a/packages/cli/src/tools/findSymlinkedModules.js b/packages/cli/src/tools/findSymlinkedModules.ts
similarity index 64%
rename from packages/cli/src/tools/findSymlinkedModules.js
rename to packages/cli/src/tools/findSymlinkedModules.ts
index 90a0f5933..0e7befe6c 100644
--- a/packages/cli/src/tools/findSymlinkedModules.js
+++ b/packages/cli/src/tools/findSymlinkedModules.ts
@@ -3,9 +3,6 @@
  *
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
- *
- * @format
- * @flow strict
  */
 
 import path from 'path';
@@ -32,7 +29,7 @@ import fs from 'fs';
  */
 export default function findSymlinkedModules(
   projectRoot: string,
-  ignoredRoots?: Array<string> = [],
+  ignoredRoots: Array<string> = [],
 ) {
   const nodeModuleRoot = path.join(projectRoot, 'node_modules');
   const resolvedSymlinks = findModuleSymlinks(nodeModuleRoot, [
@@ -52,19 +49,22 @@ function findModuleSymlinks(
 
   // Find module symlinks
   const moduleFolders = fs.readdirSync(modulesPath);
-  const symlinks = moduleFolders.reduce((links, folderName) => {
-    const folderPath = path.join(modulesPath, folderName);
-    const maybeSymlinkPaths = [];
-    if (folderName.startsWith('@')) {
-      const scopedModuleFolders = fs.readdirSync(folderPath);
-      maybeSymlinkPaths.push(
-        ...scopedModuleFolders.map(name => path.join(folderPath, name)),
-      );
-    } else {
-      maybeSymlinkPaths.push(folderPath);
-    }
-    return links.concat(resolveSymlinkPaths(maybeSymlinkPaths, ignoredPaths));
-  }, []);
+  const symlinks = moduleFolders.reduce(
+    (links, folderName) => {
+      const folderPath = path.join(modulesPath, folderName);
+      const maybeSymlinkPaths = [];
+      if (folderName.startsWith('@')) {
+        const scopedModuleFolders = fs.readdirSync(folderPath);
+        maybeSymlinkPaths.push(
+          ...scopedModuleFolders.map(name => path.join(folderPath, name)),
+        );
+      } else {
+        maybeSymlinkPaths.push(folderPath);
+      }
+      return links.concat(resolveSymlinkPaths(maybeSymlinkPaths, ignoredPaths));
+    },
+    [] as string[],
+  );
 
   // For any symlinks found, look in _that_ modules node_modules directory
   // and find any symlinked modules
@@ -78,23 +78,29 @@ function findModuleSymlinks(
           ...symlinks,
         ]),
       ),
-    [],
+    [] as string[],
   );
 
   return [...new Set([...symlinks, ...nestedSymlinks])];
 }
 
-function resolveSymlinkPaths(maybeSymlinkPaths, ignoredPaths) {
-  return maybeSymlinkPaths.reduce((links, maybeSymlinkPath) => {
-    if (fs.lstatSync(maybeSymlinkPath).isSymbolicLink()) {
-      const resolved = path.resolve(
-        path.dirname(maybeSymlinkPath),
-        fs.readlinkSync(maybeSymlinkPath),
-      );
-      if (ignoredPaths.indexOf(resolved) === -1 && fs.existsSync(resolved)) {
-        links.push(resolved);
+function resolveSymlinkPaths(
+  maybeSymlinkPaths: string[],
+  ignoredPaths: string[],
+) {
+  return maybeSymlinkPaths.reduce(
+    (links, maybeSymlinkPath) => {
+      if (fs.lstatSync(maybeSymlinkPath).isSymbolicLink()) {
+        const resolved = path.resolve(
+          path.dirname(maybeSymlinkPath),
+          fs.readlinkSync(maybeSymlinkPath),
+        );
+        if (ignoredPaths.indexOf(resolved) === -1 && fs.existsSync(resolved)) {
+          links.push(resolved);
+        }
       }
-    }
-    return links;
-  }, []);
+      return links;
+    },
+    [] as string[],
+  );
 }
diff --git a/packages/cli/src/tools/loadMetroConfig.js b/packages/cli/src/tools/loadMetroConfig.js
index aa6280ffb..78ac92a31 100644
--- a/packages/cli/src/tools/loadMetroConfig.js
+++ b/packages/cli/src/tools/loadMetroConfig.js
@@ -7,6 +7,7 @@ import {createBlacklist} from 'metro';
 import {loadConfig} from 'metro-config';
 import {existsSync} from 'fs';
 import {type ConfigT} from 'types';
+// $FlowFixMe - converted to TS
 import findSymlinkedModules from './findSymlinkedModules';
 
 const resolveSymlinksForRoots = roots =>