diff --git a/packages/babel-types/README.md b/packages/babel-types/README.md
index 417ba98145..a6cdf3593f 100644
--- a/packages/babel-types/README.md
+++ b/packages/babel-types/README.md
@@ -1519,7 +1519,7 @@ Aliases: `UserWhitespacable`, `Property`, `ObjectMember`
 
 ### objectTypeAnnotation
 ```javascript
-t.objectTypeAnnotation(properties, indexers, callProperties, exact)
+t.objectTypeAnnotation(properties, indexers, callProperties, internalSlots, exact)
 ```
 
 See also `t.isObjectTypeAnnotation(node, opts)` and `t.assertObjectTypeAnnotation(node, opts)`.
@@ -1529,6 +1529,7 @@ Aliases: `Flow`, `FlowType`
  - `properties`: `Array<ObjectTypeProperty | ObjectTypeSpreadProperty>` (required)
  - `indexers`: `Array<ObjectTypeIndexer>` (default: `null`)
  - `callProperties`: `Array<ObjectTypeCallProperty>` (default: `null`)
+ - `internalSlots`: `Array<ObjectTypeInternalSlot>` (default: `null`)
  - `exact`: `boolean` (default: `false`)
 
 ---
@@ -1564,6 +1565,23 @@ Aliases: `Flow`, `UserWhitespacable`
 
 ---
 
+### objectTypeInternalSlot
+```javascript
+t.objectTypeInternalSlot(id, value, optional, static, method)
+```
+
+See also `t.isObjectTypeInternalSlot(node, opts)` and `t.assertObjectTypeInternalSlot(node, opts)`.
+
+Aliases: `Flow`, `UserWhitespacable`
+
+ - `id`: `Identifier` (required)
+ - `value`: `FlowType` (required)
+ - `optional`: `boolean` (required)
+ - `static`: `boolean` (required)
+ - `method`: `boolean` (required)
+
+---
+
 ### objectTypeProperty
 ```javascript
 t.objectTypeProperty(key, value, variance)
diff --git a/packages/babel-types/src/asserts/generated/index.js b/packages/babel-types/src/asserts/generated/index.js
index bfc46770eb..da4d956f2d 100644
--- a/packages/babel-types/src/asserts/generated/index.js
+++ b/packages/babel-types/src/asserts/generated/index.js
@@ -456,6 +456,12 @@ export function assertObjectTypeAnnotation(
 ): void {
   assert("ObjectTypeAnnotation", node, opts);
 }
+export function assertObjectTypeInternalSlot(
+  node: Object,
+  opts?: Object = {},
+): void {
+  assert("ObjectTypeInternalSlot", node, opts);
+}
 export function assertObjectTypeCallProperty(
   node: Object,
   opts?: Object = {},
diff --git a/packages/babel-types/src/builders/generated/index.js b/packages/babel-types/src/builders/generated/index.js
index b3c07aa47d..ce88f96cf7 100644
--- a/packages/babel-types/src/builders/generated/index.js
+++ b/packages/babel-types/src/builders/generated/index.js
@@ -421,6 +421,10 @@ export function ObjectTypeAnnotation(...args: Array<any>): Object {
   return builder("ObjectTypeAnnotation", ...args);
 }
 export { ObjectTypeAnnotation as objectTypeAnnotation };
+export function ObjectTypeInternalSlot(...args: Array<any>): Object {
+  return builder("ObjectTypeInternalSlot", ...args);
+}
+export { ObjectTypeInternalSlot as objectTypeInternalSlot };
 export function ObjectTypeCallProperty(...args: Array<any>): Object {
   return builder("ObjectTypeCallProperty", ...args);
 }
diff --git a/packages/babel-types/src/validators/generated/index.js b/packages/babel-types/src/validators/generated/index.js
index a9b28a5023..06f1d9b5a0 100644
--- a/packages/babel-types/src/validators/generated/index.js
+++ b/packages/babel-types/src/validators/generated/index.js
@@ -1491,6 +1491,20 @@ export function isObjectTypeAnnotation(node: Object, opts?: Object): boolean {
 
   return false;
 }
+export function isObjectTypeInternalSlot(node: Object, opts?: Object): boolean {
+  if (!node) return false;
+
+  const nodeType = node.type;
+  if (nodeType === "ObjectTypeInternalSlot") {
+    if (typeof opts === "undefined") {
+      return true;
+    } else {
+      return shallowEqual(node, opts);
+    }
+  }
+
+  return false;
+}
 export function isObjectTypeCallProperty(node: Object, opts?: Object): boolean {
   if (!node) return false;
 
@@ -3610,6 +3624,7 @@ export function isUserWhitespacable(node: Object, opts?: Object): boolean {
     nodeType === "UserWhitespacable" ||
     "ObjectMethod" === nodeType ||
     "ObjectProperty" === nodeType ||
+    "ObjectTypeInternalSlot" === nodeType ||
     "ObjectTypeCallProperty" === nodeType ||
     "ObjectTypeIndexer" === nodeType ||
     "ObjectTypeProperty" === nodeType ||
@@ -3832,6 +3847,7 @@ export function isFlow(node: Object, opts?: Object): boolean {
     "NumberLiteralTypeAnnotation" === nodeType ||
     "NumberTypeAnnotation" === nodeType ||
     "ObjectTypeAnnotation" === nodeType ||
+    "ObjectTypeInternalSlot" === nodeType ||
     "ObjectTypeCallProperty" === nodeType ||
     "ObjectTypeIndexer" === nodeType ||
     "ObjectTypeProperty" === nodeType ||