microsoft · weswigham · Jun 4, 2026
diff --git a/_packages/native-preview/src/api/node/encoder.generated.ts b/_packages/native-preview/src/api/node/encoder.generated.ts
@@ -77,7 +77,7 @@ export function getNodeCommonData(node: Node): number {
         case SyntaxKind.ObjectLiteralExpression:
             return ((node as ObjectLiteralExpression).multiLine ? 1 : 0) << 24;
         case SyntaxKind.TypeOperator:
-            return ((node as TypeOperatorNode).operator === SyntaxKind.ReadonlyKeyword ? 1 : (node as TypeOperatorNode).operator === SyntaxKind.UniqueKeyword ? 2 : 0) << 24;
+            return ((node as TypeOperatorNode).operator === SyntaxKind.ReadonlyKeyword ? 1 : (node as TypeOperatorNode).operator === SyntaxKind.UniqueKeyword ? 2 : (node as TypeOperatorNode).operator === SyntaxKind.NotKeyword ? 3 : 0) << 24;
         case SyntaxKind.ImportAttributes:
             return ((node as ImportAttributes).multiLine ? 1 : 0) << 24 | ((node as ImportAttributes).token === SyntaxKind.AssertKeyword ? 1 : 0) << 25;
         case SyntaxKind.JsxText:

diff --git a/_packages/native-preview/src/api/node/node.generated.ts b/_packages/native-preview/src/api/node/node.generated.ts
@@ -490,6 +490,7 @@ export class RemoteNode extends RemoteNodeBase implements Node {
                 const idx = (this.data >> 24) & 0x3;
                 if (idx === 1) return SyntaxKind.ReadonlyKeyword;
                 if (idx === 2) return SyntaxKind.UniqueKeyword;
+                if (idx === 3) return SyntaxKind.NotKeyword;
                 return SyntaxKind.KeyOfKeyword;
             }
         }

diff --git a/_packages/native-preview/src/ast/ast.generated.ts b/_packages/native-preview/src/ast/ast.generated.ts
@@ -139,6 +139,7 @@ export type KeywordSyntaxKind =
     | SyntaxKind.ModuleKeyword
     | SyntaxKind.NamespaceKeyword
     | SyntaxKind.NeverKeyword
+    | SyntaxKind.NotKeyword
     | SyntaxKind.OutKeyword
     | SyntaxKind.ReadonlyKeyword
     | SyntaxKind.RequireKeyword
@@ -310,6 +311,7 @@ export type TokenSyntaxKind =
     | SyntaxKind.ModuleKeyword
     | SyntaxKind.NamespaceKeyword
     | SyntaxKind.NeverKeyword
+    | SyntaxKind.NotKeyword
     | SyntaxKind.OutKeyword
     | SyntaxKind.ReadonlyKeyword
     | SyntaxKind.RequireKeyword
@@ -958,7 +960,7 @@ export interface ConditionalTypeNode extends TypeNodeBase {
 }
 export interface TypeOperatorNode extends TypeNodeBase {
     readonly kind: SyntaxKind.TypeOperator;
-    readonly operator: SyntaxKind.KeyOfKeyword | SyntaxKind.ReadonlyKeyword | SyntaxKind.UniqueKeyword;
+    readonly operator: SyntaxKind.KeyOfKeyword | SyntaxKind.ReadonlyKeyword | SyntaxKind.UniqueKeyword | SyntaxKind.NotKeyword;
     readonly type: TypeNode;
 }
 export interface InferTypeNode extends TypeNodeBase {

diff --git a/_packages/native-preview/src/ast/factory.generated.ts b/_packages/native-preview/src/ast/factory.generated.ts
@@ -2394,7 +2394,7 @@ export function createConditionalTypeNode(checkType: TypeNode, extendsType: Type
     }) as unknown as ConditionalTypeNode;
 }
 
-export function createTypeOperatorNode(operator: SyntaxKind.KeyOfKeyword | SyntaxKind.ReadonlyKeyword | SyntaxKind.UniqueKeyword, type: TypeNode): TypeOperatorNode {
+export function createTypeOperatorNode(operator: SyntaxKind.KeyOfKeyword | SyntaxKind.ReadonlyKeyword | SyntaxKind.UniqueKeyword | SyntaxKind.NotKeyword, type: TypeNode): TypeOperatorNode {
     return new NodeObject(SyntaxKind.TypeOperator, {
         operator,
         type,

diff --git a/_scripts/ast.json b/_scripts/ast.json
@@ -176,6 +176,7 @@
             "ModuleKeyword",
             "NamespaceKeyword",
             "NeverKeyword",
+            "NotKeyword",
             "OutKeyword",
             "ReadonlyKeyword",
             "RequireKeyword",
@@ -3539,7 +3540,8 @@
                         "type": [
                             "SyntaxKind.KeyOfKeyword",
                             "SyntaxKind.ReadonlyKeyword",
-                            "SyntaxKind.UniqueKeyword"
+                            "SyntaxKind.UniqueKeyword",
+                            "SyntaxKind.NotKeyword"
                         ]
                     },
                     {

diff --git a/internal/api/encoder/decoder_generated.go b/internal/api/encoder/decoder_generated.go
diff --git a/internal/api/encoder/encoder_generated.go b/internal/api/encoder/encoder_generated.go
diff --git a/internal/ast/ast_generated.go b/internal/ast/ast_generated.go
diff --git a/internal/ast/kind_generated.go b/internal/ast/kind_generated.go