diff --git a/packages/babel-types/scripts/generators/flow.js b/packages/babel-types/scripts/generators/flow.js
index 50f20bc611..ade85fc498 100644
--- a/packages/babel-types/scripts/generators/flow.js
+++ b/packages/babel-types/scripts/generators/flow.js
@@ -43,6 +43,7 @@ declare class ${NODE_PREFIX} {
   start: ?number;
   end: ?number;
   loc: ?${NODE_PREFIX}SourceLocation;
+  extra?: { [string]: mixed };
 }\n\n`;
 
 //
diff --git a/packages/babel-types/scripts/generators/typescript.js b/packages/babel-types/scripts/generators/typescript.js
index ef460a7345..405d2e776a 100644
--- a/packages/babel-types/scripts/generators/typescript.js
+++ b/packages/babel-types/scripts/generators/typescript.js
@@ -45,6 +45,7 @@ interface BaseNode {
   end: number | null;
   loc: SourceLocation | null;
   type: Node["type"];
+  extra?: Record<string, unknown>;
 }
 
 export type Node = ${t.TYPES.sort().join(" | ")};\n\n`;