diff --git a/lib/index.js b/lib/index.js
index a2ce828e837..11a9ff9b0ab 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -12,6 +12,7 @@ const memoize = require("./util/memoize");
 /** @typedef {import("../declarations/WebpackOptions").EntryNormalized} EntryNormalized */
 /** @typedef {import("../declarations/WebpackOptions").EntryObject} EntryObject */
 /** @typedef {import("../declarations/WebpackOptions").ExternalItemFunctionData} ExternalItemFunctionData */
+/** @typedef {import("../declarations/WebpackOptions").ExternalItemObjectKnown} ExternalItemObjectKnown */
 /** @typedef {import("../declarations/WebpackOptions").ExternalItemValue} ExternalItemValue */
 /** @typedef {import("../declarations/WebpackOptions").Externals} Externals */
 /** @typedef {import("../declarations/WebpackOptions").FileCacheOptions} FileCacheOptions */
diff --git a/types.d.ts b/types.d.ts
index 77008b0c266..d861fc10ae8 100644
--- a/types.d.ts
+++ b/types.d.ts
@@ -13191,6 +13191,7 @@ declare namespace exports {
 		EntryNormalized,
 		EntryObject,
 		ExternalItemFunctionData,
+		ExternalItemObjectKnown,
 		ExternalItemValue,
 		Externals,
 		FileCacheOptions,