diff --git a/packages/react-native-codegen/src/CodegenSchema.js b/packages/react-native-codegen/src/CodegenSchema.js
index 36e08a6bb6e..0e2a5ec60dc 100644
--- a/packages/react-native-codegen/src/CodegenSchema.js
+++ b/packages/react-native-codegen/src/CodegenSchema.js
@@ -262,7 +262,7 @@ export type SchemaType = $ReadOnly<{|
 export type NativeModuleShape = $ReadOnly<{|
   // We only support aliases to Objects
   aliases: NativeModuleAliasMap,
-  properties: $ReadOnlyArray<NativeModuleMethodTypeShape>,
+  properties: $ReadOnlyArray<NativeModulePropertyShape>,
 |}>;
 
 export type NativeModuleAliasMap = $ReadOnly<{
@@ -276,16 +276,15 @@ export type ObjectTypeAliasTypeShape = $ReadOnly<{|
   properties: $ReadOnlyArray<ObjectParamTypeAnnotation>,
 |}>;
 
-export type NativeModuleMethodTypeShape = $ReadOnly<{|
+export type NativeModulePropertyShape = $ReadOnly<{|
   name: string,
-  typeAnnotation: FunctionTypeAnnotation,
-|}>;
-
-export type FunctionTypeAnnotation = $ReadOnly<{|
-  type: 'FunctionTypeAnnotation',
-  params: $ReadOnlyArray<FunctionTypeAnnotationParam>,
-  returnTypeAnnotation: FunctionTypeAnnotationReturn,
   optional: boolean,
+  typeAnnotation: $ReadOnly<{|
+    type: 'FunctionTypeAnnotation',
+    params: $ReadOnlyArray<FunctionTypeAnnotationParam>,
+    returnTypeAnnotation: FunctionTypeAnnotationReturn,
+    nullable: boolean,
+  |}>,
 |}>;
 
 export type FunctionTypeAnnotationReturn =
diff --git a/packages/react-native-codegen/src/generators/modules/GenerateModuleJavaSpec.js b/packages/react-native-codegen/src/generators/modules/GenerateModuleJavaSpec.js
index 5054146e4ff..43937022e4f 100644
--- a/packages/react-native-codegen/src/generators/modules/GenerateModuleJavaSpec.js
+++ b/packages/react-native-codegen/src/generators/modules/GenerateModuleJavaSpec.js
@@ -13,7 +13,7 @@
 import type {
   FunctionTypeAnnotationParam,
   FunctionTypeAnnotationReturn,
-  NativeModuleMethodTypeShape,
+  NativeModulePropertyShape,
   ObjectTypeAliasTypeShape,
   SchemaType,
 } from '../../CodegenSchema';
@@ -156,7 +156,7 @@ function translateFunctionReturnTypeToJavaType(
 
 // Build special-cased runtime check for getConstants().
 function buildGetConstantsMethod(
-  method: NativeModuleMethodTypeShape,
+  method: NativeModulePropertyShape,
   imports: Set<string>,
 ): string {
   if (
diff --git a/packages/react-native-codegen/src/generators/modules/__test_fixtures__/fixtures.js b/packages/react-native-codegen/src/generators/modules/__test_fixtures__/fixtures.js
index cea663c8b1b..1c5a3b9127d 100644
--- a/packages/react-native-codegen/src/generators/modules/__test_fixtures__/fixtures.js
+++ b/packages/react-native-codegen/src/generators/modules/__test_fixtures__/fixtures.js
@@ -34,6 +34,7 @@ const SIMPLE_NATIVE_MODULES: SchemaType = {
           properties: [
             {
               name: 'getConstants',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -64,11 +65,12 @@ const SIMPLE_NATIVE_MODULES: SchemaType = {
                   ],
                 },
                 params: [],
-                optional: false,
+                nullable: false,
               },
             },
             {
               name: 'voidFunc',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -76,11 +78,12 @@ const SIMPLE_NATIVE_MODULES: SchemaType = {
                   type: 'VoidTypeAnnotation',
                 },
                 params: [],
-                optional: false,
+                nullable: false,
               },
             },
             {
               name: 'getBool',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -96,11 +99,12 @@ const SIMPLE_NATIVE_MODULES: SchemaType = {
                     },
                   },
                 ],
-                optional: false,
+                nullable: false,
               },
             },
             {
               name: 'getNumber',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -116,11 +120,12 @@ const SIMPLE_NATIVE_MODULES: SchemaType = {
                     },
                   },
                 ],
-                optional: false,
+                nullable: false,
               },
             },
             {
               name: 'getString',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -136,11 +141,12 @@ const SIMPLE_NATIVE_MODULES: SchemaType = {
                     },
                   },
                 ],
-                optional: false,
+                nullable: false,
               },
             },
             {
               name: 'getArray',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -162,11 +168,12 @@ const SIMPLE_NATIVE_MODULES: SchemaType = {
                     },
                   },
                 ],
-                optional: false,
+                nullable: false,
               },
             },
             {
               name: 'getObject',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -182,11 +189,12 @@ const SIMPLE_NATIVE_MODULES: SchemaType = {
                     },
                   },
                 ],
-                optional: false,
+                nullable: false,
               },
             },
             {
               name: 'getRootTag',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -204,11 +212,12 @@ const SIMPLE_NATIVE_MODULES: SchemaType = {
                     },
                   },
                 ],
-                optional: false,
+                nullable: false,
               },
             },
             {
               name: 'getValue',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -238,11 +247,12 @@ const SIMPLE_NATIVE_MODULES: SchemaType = {
                     },
                   },
                 ],
-                optional: false,
+                nullable: false,
               },
             },
             {
               name: 'getValueWithCallback',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -258,11 +268,12 @@ const SIMPLE_NATIVE_MODULES: SchemaType = {
                     },
                   },
                 ],
-                optional: false,
+                nullable: false,
               },
             },
             {
               name: 'getValueWithPromise',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -278,7 +289,7 @@ const SIMPLE_NATIVE_MODULES: SchemaType = {
                     },
                   },
                 ],
-                optional: false,
+                nullable: false,
               },
             },
           ],
@@ -297,6 +308,7 @@ const TWO_MODULES_SAME_FILE: SchemaType = {
           properties: [
             {
               name: 'voidFunc',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -304,7 +316,7 @@ const TWO_MODULES_SAME_FILE: SchemaType = {
                   type: 'VoidTypeAnnotation',
                 },
                 params: [],
-                optional: false,
+                nullable: false,
               },
             },
           ],
@@ -314,6 +326,7 @@ const TWO_MODULES_SAME_FILE: SchemaType = {
           properties: [
             {
               name: 'voidFunc',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -321,7 +334,7 @@ const TWO_MODULES_SAME_FILE: SchemaType = {
                   type: 'VoidTypeAnnotation',
                 },
                 params: [],
-                optional: false,
+                nullable: false,
               },
             },
           ],
@@ -340,6 +353,7 @@ const TWO_MODULES_DIFFERENT_FILES: SchemaType = {
           properties: [
             {
               name: 'voidFunc',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -347,7 +361,7 @@ const TWO_MODULES_DIFFERENT_FILES: SchemaType = {
                   type: 'VoidTypeAnnotation',
                 },
                 params: [],
-                optional: false,
+                nullable: false,
               },
             },
           ],
@@ -361,6 +375,7 @@ const TWO_MODULES_DIFFERENT_FILES: SchemaType = {
           properties: [
             {
               name: 'getConstants',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -369,11 +384,12 @@ const TWO_MODULES_DIFFERENT_FILES: SchemaType = {
                   properties: [],
                 },
                 params: [],
-                optional: false,
+                nullable: false,
               },
             },
             {
               name: 'voidFunc',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -381,7 +397,7 @@ const TWO_MODULES_DIFFERENT_FILES: SchemaType = {
                   type: 'VoidTypeAnnotation',
                 },
                 params: [],
-                optional: false,
+                nullable: false,
               },
             },
           ],
@@ -400,6 +416,7 @@ const COMPLEX_OBJECTS: SchemaType = {
           properties: [
             {
               name: 'difficult',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -491,11 +508,12 @@ const COMPLEX_OBJECTS: SchemaType = {
                     },
                   },
                 ],
-                optional: false,
+                nullable: false,
               },
             },
             {
               name: 'optionals',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -567,11 +585,12 @@ const COMPLEX_OBJECTS: SchemaType = {
                     },
                   },
                 ],
-                optional: false,
+                nullable: false,
               },
             },
             {
               name: 'optionalMethod',
+              optional: true,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -617,11 +636,12 @@ const COMPLEX_OBJECTS: SchemaType = {
                     },
                   },
                 ],
-                optional: true,
+                nullable: true,
               },
             },
             {
               name: 'getArrays',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -698,7 +718,7 @@ const COMPLEX_OBJECTS: SchemaType = {
                     },
                   },
                 ],
-                optional: false,
+                nullable: false,
               },
             },
           ],
@@ -806,6 +826,7 @@ const NATIVE_MODULES_WITH_TYPE_ALIASES: SchemaType = {
           properties: [
             {
               name: 'getConstants',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -814,11 +835,12 @@ const NATIVE_MODULES_WITH_TYPE_ALIASES: SchemaType = {
                   properties: [],
                 },
                 params: [],
-                optional: false,
+                nullable: false,
               },
             },
             {
               name: 'cropImage',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -835,7 +857,7 @@ const NATIVE_MODULES_WITH_TYPE_ALIASES: SchemaType = {
                     },
                   },
                 ],
-                optional: false,
+                nullable: false,
               },
             },
           ],
@@ -1092,6 +1114,7 @@ const REAL_MODULE_EXAMPLE: SchemaType = {
           properties: [
             {
               name: 'getConstants',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -1100,11 +1123,12 @@ const REAL_MODULE_EXAMPLE: SchemaType = {
                   properties: [],
                 },
                 params: [],
-                optional: false,
+                nullable: false,
               },
             },
             {
               name: 'getPhotos',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -1121,11 +1145,12 @@ const REAL_MODULE_EXAMPLE: SchemaType = {
                     },
                   },
                 ],
-                optional: false,
+                nullable: false,
               },
             },
             {
               name: 'saveToCameraRoll',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -1148,11 +1173,12 @@ const REAL_MODULE_EXAMPLE: SchemaType = {
                     },
                   },
                 ],
-                optional: false,
+                nullable: false,
               },
             },
             {
               name: 'deletePhotos',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -1171,7 +1197,7 @@ const REAL_MODULE_EXAMPLE: SchemaType = {
                     },
                   },
                 ],
-                optional: false,
+                nullable: false,
               },
             },
           ],
@@ -1185,6 +1211,7 @@ const REAL_MODULE_EXAMPLE: SchemaType = {
           properties: [
             {
               name: 'openCameraDialog',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -1230,7 +1257,7 @@ const REAL_MODULE_EXAMPLE: SchemaType = {
                     },
                   },
                 ],
-                optional: false,
+                nullable: false,
               },
             },
           ],
@@ -1350,6 +1377,7 @@ const REAL_MODULE_EXAMPLE: SchemaType = {
           properties: [
             {
               name: 'reportFatalException',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -1383,11 +1411,12 @@ const REAL_MODULE_EXAMPLE: SchemaType = {
                     },
                   },
                 ],
-                optional: false,
+                nullable: false,
               },
             },
             {
               name: 'reportSoftException',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -1421,11 +1450,12 @@ const REAL_MODULE_EXAMPLE: SchemaType = {
                     },
                   },
                 ],
-                optional: false,
+                nullable: false,
               },
             },
             {
               name: 'reportException',
+              optional: true,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -1442,11 +1472,12 @@ const REAL_MODULE_EXAMPLE: SchemaType = {
                     },
                   },
                 ],
-                optional: true,
+                nullable: true,
               },
             },
             {
               name: 'updateExceptionMessage',
+              optional: false,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -1480,11 +1511,12 @@ const REAL_MODULE_EXAMPLE: SchemaType = {
                     },
                   },
                 ],
-                optional: false,
+                nullable: false,
               },
             },
             {
               name: 'dismissRedbox',
+              optional: true,
               typeAnnotation: {
                 type: 'FunctionTypeAnnotation',
                 returnTypeAnnotation: {
@@ -1492,7 +1524,7 @@ const REAL_MODULE_EXAMPLE: SchemaType = {
                   type: 'VoidTypeAnnotation',
                 },
                 params: [],
-                optional: true,
+                nullable: true,
               },
             },
           ],
diff --git a/packages/react-native-codegen/src/parsers/flow/modules/__tests__/__snapshots__/module-parser-test.js.snap b/packages/react-native-codegen/src/parsers/flow/modules/__tests__/__snapshots__/module-parser-test.js.snap
index 1fcaee4231a..54ae74f6566 100644
--- a/packages/react-native-codegen/src/parsers/flow/modules/__tests__/__snapshots__/module-parser-test.js.snap
+++ b/packages/react-native-codegen/src/parsers/flow/modules/__tests__/__snapshots__/module-parser-test.js.snap
@@ -75,8 +75,9 @@ Object {
           "properties": Array [
             Object {
               "name": "getNumber",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "arg",
@@ -95,8 +96,9 @@ Object {
             },
             Object {
               "name": "getVoid",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [],
                 "returnTypeAnnotation": Object {
                   "nullable": false,
@@ -107,8 +109,9 @@ Object {
             },
             Object {
               "name": "getArray",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "a",
@@ -139,8 +142,9 @@ Object {
             },
             Object {
               "name": "getStringFromAlias",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "a",
@@ -176,8 +180,9 @@ Object {
           "properties": Array [
             Object {
               "name": "getArray",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "arg",
@@ -218,8 +223,9 @@ Object {
           "properties": Array [
             Object {
               "name": "getArray",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "arg",
@@ -256,8 +262,9 @@ Object {
           "properties": Array [
             Object {
               "name": "getArray",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "arg",
@@ -282,8 +289,9 @@ Object {
             },
             Object {
               "name": "getArray",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "arg",
@@ -324,8 +332,9 @@ Object {
           "properties": Array [
             Object {
               "name": "passBool",
+              "optional": true,
               "typeAnnotation": Object {
-                "optional": true,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "arg",
@@ -344,8 +353,9 @@ Object {
             },
             Object {
               "name": "passNumber",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "arg",
@@ -364,8 +374,9 @@ Object {
             },
             Object {
               "name": "passString",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "arg",
@@ -384,8 +395,9 @@ Object {
             },
             Object {
               "name": "passStringish",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "arg",
@@ -420,8 +432,9 @@ Object {
           "properties": Array [
             Object {
               "name": "getValueWithCallback",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "callback",
@@ -456,8 +469,9 @@ Object {
           "properties": Array [
             Object {
               "name": "getArray",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "arg",
@@ -516,8 +530,9 @@ Object {
           "properties": Array [
             Object {
               "name": "getObject",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "arg",
@@ -572,8 +587,9 @@ Object {
             },
             Object {
               "name": "getReadOnlyObject",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "arg",
@@ -628,8 +644,9 @@ Object {
             },
             Object {
               "name": "getObject2",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "arg",
@@ -657,8 +674,9 @@ Object {
             },
             Object {
               "name": "getObjectInArray",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "arg",
@@ -732,8 +750,9 @@ Object {
           "properties": Array [
             Object {
               "name": "getConstants",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [],
                 "returnTypeAnnotation": Object {
                   "nullable": false,
@@ -834,8 +853,9 @@ Object {
           "properties": Array [
             Object {
               "name": "getInt",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "arg",
@@ -854,8 +874,9 @@ Object {
             },
             Object {
               "name": "getFloat",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "arg",
@@ -924,8 +945,9 @@ Object {
           "properties": Array [
             Object {
               "name": "foo1",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "x",
@@ -946,8 +968,9 @@ Object {
             },
             Object {
               "name": "foo2",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "x",
@@ -983,8 +1006,9 @@ Object {
           "properties": Array [
             Object {
               "name": "voidFunc",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "arg",
@@ -1032,8 +1056,9 @@ Object {
           "properties": Array [
             Object {
               "name": "getConstants",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [],
                 "returnTypeAnnotation": Object {
                   "nullable": false,
@@ -1063,8 +1088,9 @@ Object {
             },
             Object {
               "name": "getConstants2",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [],
                 "returnTypeAnnotation": Object {
                   "nullable": false,
@@ -1123,8 +1149,9 @@ Object {
           "properties": Array [
             Object {
               "name": "getValueWithPromise",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [],
                 "returnTypeAnnotation": Object {
                   "nullable": false,
@@ -1135,8 +1162,9 @@ Object {
             },
             Object {
               "name": "getValueWithPromiseDefinedSomewhereElse",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [],
                 "returnTypeAnnotation": Object {
                   "nullable": false,
@@ -1147,8 +1175,9 @@ Object {
             },
             Object {
               "name": "getValueWithPromiseObjDefinedSomewhereElse",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [],
                 "returnTypeAnnotation": Object {
                   "nullable": false,
@@ -1175,8 +1204,9 @@ Object {
           "properties": Array [
             Object {
               "name": "getRootTag",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "rootTag",
@@ -1213,8 +1243,9 @@ Object {
           "properties": Array [
             Object {
               "name": "getObject",
+              "optional": false,
               "typeAnnotation": Object {
-                "optional": false,
+                "nullable": false,
                 "params": Array [
                   Object {
                     "name": "o",
diff --git a/packages/react-native-codegen/src/parsers/flow/modules/methods.js b/packages/react-native-codegen/src/parsers/flow/modules/methods.js
index 17764051194..e3773c01215 100644
--- a/packages/react-native-codegen/src/parsers/flow/modules/methods.js
+++ b/packages/react-native-codegen/src/parsers/flow/modules/methods.js
@@ -11,7 +11,7 @@
 'use strict';
 
 import type {
-  NativeModuleMethodTypeShape,
+  NativeModulePropertyShape,
   FunctionTypeAnnotationParam,
   FunctionTypeAnnotationReturn,
 } from '../../../CodegenSchema.js';
@@ -24,9 +24,6 @@ const {
 } = require('./properties');
 const invariant = require('invariant');
 
-// $FlowFixMe there's no flowtype for ASTs
-type MethodAST = Object;
-
 function getTypeAnnotationForParam(
   name: string,
   paramAnnotation: ASTNode,
@@ -315,16 +312,35 @@ function getReturnTypeAnnotation(
 }
 
 function buildMethodSchema(
-  property: MethodAST,
+  // TODO(T71778680): This is an ObjectTypeProperty containing either:
+  // - a FunctionTypeAnnotation or GenericTypeAnnotation
+  // - a NullableTypeAnnoation containing a FunctionTypeAnnotation or GenericTypeAnnotation
+  // Flow type this node
+  property: $FlowFixMe,
   types: TypeDeclarationMap,
-): NativeModuleMethodTypeShape {
-  const name: string = property.key.name;
-  const value = getValueFromTypes(property.value, types);
+): NativeModulePropertyShape {
+  let nullable = false;
+  let {key, value} = property;
+
+  // Unwrap Nullable types
+  if (value.type === 'NullableTypeAnnotation') {
+    nullable = true;
+    value = value.typeAnnotation;
+  }
+
+  const name: string = key.name;
+
+  // Resolve type aliases
+  if (value.type === 'GenericTypeAnnotation') {
+    value = getValueFromTypes(value, types);
+  }
+
   if (value.type !== 'FunctionTypeAnnotation') {
     throw new Error(
       `Only methods are supported as module properties. Found ${value.type} in ${property.key.name}`,
     );
   }
+
   const params = value.params.map(param =>
     getTypeAnnotationForParam(name, param, types),
   );
@@ -334,20 +350,22 @@ function buildMethodSchema(
     value.returnType,
     types,
   );
+
   return {
     name,
+    optional: property.optional,
     typeAnnotation: {
       type: 'FunctionTypeAnnotation',
       returnTypeAnnotation,
       params,
-      optional: property.optional,
+      nullable,
     },
   };
 }
 
 function getMethods(
   types: TypeDeclarationMap,
-): $ReadOnlyArray<NativeModuleMethodTypeShape> {
+): $ReadOnlyArray<NativeModulePropertyShape> {
   const moduleInterfaceNames = Object.keys(types).filter((typeName: string) => {
     const declaration = types[typeName];
     return (
@@ -368,8 +386,7 @@ function getMethods(
   const declaration = types[moduleInterfaceName];
   return declaration.body.properties
     .filter(property => property.type === 'ObjectTypeProperty')
-    .map(property => buildMethodSchema(property, types))
-    .filter(Boolean);
+    .map(property => buildMethodSchema(property, types));
 }
 
 module.exports = {