diff --git a/tools/build_defs/oss/rn_defs.bzl b/tools/build_defs/oss/rn_defs.bzl
index 1f50344f63f..2f73d5f4466 100644
--- a/tools/build_defs/oss/rn_defs.bzl
+++ b/tools/build_defs/oss/rn_defs.bzl
@@ -62,58 +62,57 @@ def rn_xplat_cxx_library(name, **kwargs):
     }
 
     native.cxx_library(
-        name=name,
-        visibility=kwargs.get("visibility", []),
+        name = name,
+        visibility = kwargs.get("visibility", []),
         **new_kwargs
     )
 
 # Example: react_native_target('java/com/facebook/react/common:common')
 def react_native_target(path):
-    return '//ReactAndroid/src/main/' + path
+    return "//ReactAndroid/src/main/" + path
 
 # Example: react_native_xplat_target('bridge:bridge')
 def react_native_xplat_target(path):
-    return '//ReactCommon/' + path
+    return "//ReactCommon/" + path
 
 # Example: react_native_tests_target('java/com/facebook/react/modules:modules')
 def react_native_tests_target(path):
-    return '//ReactAndroid/src/test/' + path
+    return "//ReactAndroid/src/test/" + path
 
 # Example: react_native_integration_tests_target('java/com/facebook/react/testing:testing')
 def react_native_integration_tests_target(path):
-    return '//ReactAndroid/src/androidTest/' + path
+    return "//ReactAndroid/src/androidTest/" + path
 
 # Helper for referring to non-RN code from RN OSS code.
 # Example: react_native_dep('java/com/facebook/systrace:systrace')
 def react_native_dep(path):
-    return '//ReactAndroid/src/main/' + path
+    return "//ReactAndroid/src/main/" + path
 
 # React property preprocessor
-def rn_android_library(name, deps=[], plugins=[], *args, **kwargs):
-
+def rn_android_library(name, deps = [], plugins = [], *args, **kwargs):
     if react_native_target(
-        'java/com/facebook/react/uimanager/annotations:annotations'
-    ) in deps and name != 'processing':
+        "java/com/facebook/react/uimanager/annotations:annotations",
+    ) in deps and name != "processing":
         react_property_plugins = [
             react_native_target(
-                'java/com/facebook/react/processing:processing'
+                "java/com/facebook/react/processing:processing",
             ),
         ]
 
         plugins = list(set(plugins + react_property_plugins))
 
     if react_native_target(
-        'java/com/facebook/react/module/annotations:annotations'
-    ) in deps and name != 'processing':
+        "java/com/facebook/react/module/annotations:annotations",
+    ) in deps and name != "processing":
         react_module_plugins = [
             react_native_target(
-                'java/com/facebook/react/module/processing:processing'
+                "java/com/facebook/react/module/processing:processing",
             ),
         ]
 
         plugins = list(set(plugins + react_module_plugins))
 
-    native.android_library(name=name, deps=deps, plugins=plugins, *args, **kwargs)
+    native.android_library(name = name, deps = deps, plugins = plugins, *args, **kwargs)
 
 def rn_android_binary(*args, **kwargs):
     native.android_binary(*args, **kwargs)
@@ -139,40 +138,40 @@ def rn_prebuilt_native_library(*args, **kwargs):
 def rn_prebuilt_jar(*args, **kwargs):
     native.prebuilt_jar(*args, **kwargs)
 
-def rn_robolectric_test(name, srcs, vm_args=None, *args, **kwargs):
+def rn_robolectric_test(name, srcs, vm_args = None, *args, **kwargs):
     vm_args = vm_args or []
 
     extra_vm_args = [
-        '-XX:+UseConcMarkSweepGC',  # required by -XX:+CMSClassUnloadingEnabled
-        '-XX:+CMSClassUnloadingEnabled',
-        '-XX:ReservedCodeCacheSize=150M',
-        '-Drobolectric.dependency.dir=buck-out/gen/ReactAndroid/src/main/third-party/java/robolectric3/robolectric',
-        '-Dlibraries=buck-out/gen/ReactAndroid/src/main/third-party/java/robolectric3/robolectric/*.jar',
-        '-Drobolectric.logging.enabled=true',
-        '-XX:MaxPermSize=620m',
-        '-Drobolectric.offline=true',
+        "-XX:+UseConcMarkSweepGC",  # required by -XX:+CMSClassUnloadingEnabled
+        "-XX:+CMSClassUnloadingEnabled",
+        "-XX:ReservedCodeCacheSize=150M",
+        "-Drobolectric.dependency.dir=buck-out/gen/ReactAndroid/src/main/third-party/java/robolectric3/robolectric",
+        "-Dlibraries=buck-out/gen/ReactAndroid/src/main/third-party/java/robolectric3/robolectric/*.jar",
+        "-Drobolectric.logging.enabled=true",
+        "-XX:MaxPermSize=620m",
+        "-Drobolectric.offline=true",
     ]
     if native.read_config("user", "use_dev_shm"):
-        extra_vm_args.append('-Djava.io.tmpdir=/dev/shm')
+        extra_vm_args.append("-Djava.io.tmpdir=/dev/shm")
 
     # RN tests use  Powermock, which means they get their own ClassLoaders.
     # Because the yoga native library (or any native library) can only be loaded into one
     # ClassLoader at a time, we need to run each in its own process, hence fork_mode = 'per_test'.
     native.robolectric_test(
-        name=name,
-        use_cxx_libraries=True,
-        cxx_library_whitelist=[
-            '//ReactCommon/yoga:yoga',
-            '//ReactAndroid/src/main/jni/first-party/yogajni:jni',
+        name = name,
+        use_cxx_libraries = True,
+        cxx_library_whitelist = [
+            "//ReactCommon/yoga:yoga",
+            "//ReactAndroid/src/main/jni/first-party/yogajni:jni",
         ],
-        fork_mode='per_test',
-        srcs=srcs,
-        vm_args=vm_args + extra_vm_args,
+        fork_mode = "per_test",
+        srcs = srcs,
+        vm_args = vm_args + extra_vm_args,
         *args,
         **kwargs
     )
 
-def cxx_library(allow_jni_merging=None, **kwargs):
+def cxx_library(allow_jni_merging = None, **kwargs):
     args = {
         k: v
         for k, v in kwargs.items()
@@ -181,18 +180,18 @@ def cxx_library(allow_jni_merging=None, **kwargs):
     native.cxx_library(**args)
 
 def _paths_join(path, *others):
-  """Joins one or more path components."""
-  result = path
+    """Joins one or more path components."""
+    result = path
 
-  for p in others:
-    if p.startswith("/"):  # absolute
-      result = p
-    elif not result or result.endswith("/"):
-      result += p
-    else:
-      result += "/" + p
+    for p in others:
+        if p.startswith("/"):  # absolute
+            result = p
+        elif not result or result.endswith("/"):
+            result += p
+        else:
+            result += "/" + p
 
-  return result
+    return result
 
 def subdir_glob(glob_specs, exclude = None, prefix = ""):
     """Returns a dict of sub-directory relative paths to full paths.