Adjust type generation to correctly cater for ambient definitions (#5034)

packages/api-augment/src/substrate/errors.ts

@@ -1,7 +1,9 @@
 // Auto-generated via `yarn polkadot-types-from-chain`, do not edit
 /* eslint-disable */
 
-// import '@polkadot/api-base/types/errors';
+// import type lookup before we augment - in some environments
+// this is required to allow for ambient/previous definitions
+import '@polkadot/api-base/types/errors';
 
 import type { ApiTypes, AugmentedError } from '@polkadot/api-base/types';