diff --git a/packages/babel-types/src/asserts/generated/index.js b/packages/babel-types/src/asserts/generated/index.js
index 60a91b88178d..db77578f01d1 100644
--- a/packages/babel-types/src/asserts/generated/index.js
+++ b/packages/babel-types/src/asserts/generated/index.js
@@ -836,6 +836,9 @@ export function assertTSUnknownKeyword(node: Object, opts?: Object = {}): void {
 export function assertTSVoidKeyword(node: Object, opts?: Object = {}): void {
   assert("TSVoidKeyword", node, opts);
 }
+export function assertTSAssertsKeyword(node: Object, opts?: Object = {}): void {
+  assert("TSAssertsKeyword", node, opts);
+}
 export function assertTSThisType(node: Object, opts?: Object = {}): void {
   assert("TSThisType", node, opts);
 }
diff --git a/packages/babel-types/src/builders/generated/index.js b/packages/babel-types/src/builders/generated/index.js
index 2cb9d5490c9d..926d4e3d62d8 100644
--- a/packages/babel-types/src/builders/generated/index.js
+++ b/packages/babel-types/src/builders/generated/index.js
@@ -781,6 +781,11 @@ export function TSVoidKeyword(...args: Array<any>): Object {
 }
 export { TSVoidKeyword as tsVoidKeyword };
 export { TSVoidKeyword as tSVoidKeyword };
+export function TSAssertsKeyword(...args: Array<any>): Object {
+  return builder("TSAssertsKeyword", ...args);
+}
+export { TSAssertsKeyword as tsAssertsKeyword };
+export { TSAssertsKeyword as tSAssertsKeyword };
 export function TSThisType(...args: Array<any>): Object {
   return builder("TSThisType", ...args);
 }
diff --git a/packages/babel-types/src/definitions/typescript.js b/packages/babel-types/src/definitions/typescript.js
index bcdb878b22c5..c3a650f69e0c 100644
--- a/packages/babel-types/src/definitions/typescript.js
+++ b/packages/babel-types/src/definitions/typescript.js
@@ -180,7 +180,7 @@ defineType("TSTypePredicate", {
   fields: {
     assertsModifier: validateOptionalType("TSAssertsKeyword"),
     parameterName: validateType(["Identifier", "TSThisType"]),
-    typeAnnotation: validateType("TSTypeAnnotation"),
+    typeAnnotation: validateOptionalType("TSTypeAnnotation"),
   },
 });
 
diff --git a/packages/babel-types/src/validators/generated/index.js b/packages/babel-types/src/validators/generated/index.js
index 84f44ef882cd..15ebabecaeee 100644
--- a/packages/babel-types/src/validators/generated/index.js
+++ b/packages/babel-types/src/validators/generated/index.js
@@ -2691,6 +2691,20 @@ export function isTSVoidKeyword(node: ?Object, opts?: Object): boolean {
 
   return false;
 }
+export function isTSAssertsKeyword(node: ?Object, opts?: Object): boolean {
+  if (!node) return false;
+
+  const nodeType = node.type;
+  if (nodeType === "TSAssertsKeyword") {
+    if (typeof opts === "undefined") {
+      return true;
+    } else {
+      return shallowEqual(node, opts);
+    }
+  }
+
+  return false;
+}
 export function isTSThisType(node: ?Object, opts?: Object): boolean {
   if (!node) return false;
 
@@ -4365,6 +4379,7 @@ export function isTSType(node: ?Object, opts?: Object): boolean {
     "TSUndefinedKeyword" === nodeType ||
     "TSUnknownKeyword" === nodeType ||
     "TSVoidKeyword" === nodeType ||
+    "TSAssertsKeyword" === nodeType ||
     "TSThisType" === nodeType ||
     "TSFunctionType" === nodeType ||
     "TSConstructorType" === nodeType ||