Don't re-export things unnecessarily.

Author: alcuadrado

v-next/hardhat/src/config.ts

@@ -1,8 +1,8 @@
 import { findClosestHardhatConfig } from "./internal/helpers/config-loading.js";
 
-// Note: We export the builtin plugins' types here, so that any type extension
+// Note: We import the builtin plugins' types here, so that any type extension
 // they may have gets loaded.
-export type * from "./internal/builtin-plugins/index.js";
+import "./internal/builtin-plugins/index.js";
 
 export type * from "@nomicfoundation/hardhat-core/config";
 export * from "@nomicfoundation/hardhat-core/config";

v-next/hardhat/src/internal/builtin-plugins/hardhat-foo/index.ts

@@ -2,7 +2,7 @@ import type { HardhatPlugin } from "@nomicfoundation/hardhat-core/types/plugins"
 
 import { globalFlag, task } from "@nomicfoundation/hardhat-core/config";
 
-export type * from "./type-extensions.js";
+import "./type-extensions.js";
 
 export default {
   id: "hardhat-foo",